10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the quarterly period ended June 27, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File Number 0-19655

TETRA TECH, INC.

(Exact name of registrant as specified in its charter)

Delaware	95-4148514
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

3475 East Foothill Boulevard, Pasadena, California 91107

(Address of principal executive offices)  (Zip Code)

(626) 351-4664

(Registrant’s telephone number, including area code) 

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.01 par value	TTEK	The NASDAQ Stock Market LLC

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes  ☒   No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes  ☒   No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. 

Large accelerated filer	☒	Accelerated filer	☐	Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐   No  ☒

As of July 19, 2021, 54,071,184 shares of the registrant’s common stock were outstanding.

TETRA TECH, INC.

INDEX

 

PART I.	FINANCIAL INFORMATION	PAGE NO.
Item 1.	Financial Statements (Unaudited)	3
	Consolidated Balance Sheets as of June 27, 2021 and September 27, 2020	3
	Consolidated Statements of Income for the Three and Nine Months Ended June 27, 2021 and June 28, 2020	4
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended June 27, 2021 and June 28, 2020	5
	Consolidated Statements of Cash Flows for the Nine Months Ended June 27, 2021 and June 28, 2020	6
	Consolidated Statements of Equity for the Three and Nine Months Ended June 27, 2021 and June 28, 2020	7
	Notes to Unaudited Consolidated Financial Statements	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	36
Item 4.	Controls and Procedures	36
PART II.	OTHER INFORMATION	36
Item 1.	Legal Proceedings	36
Item 1A.	Risk Factors	37
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	37
Item 4.	Mine Safety Disclosures	37
Item 6.	Exhibits	37
SIGNATURES		39

2

PART I.                                                  FINANCIAL INFORMATION

    Item 1.                                 Financial Statements

 Tetra Tech, Inc.

Consolidated Balance Sheets

(unaudited - in thousands, except par value)

ASSETS	June 27, 2021		September 27, 2020
Current assets:
Cash and cash equivalents	$	234,266	$	157,515
Accounts receivable, net	664,393		649,035
Contract assets	91,405		92,632
Prepaid expenses and other current assets	95,576		81,094
Income taxes receivable	20,781		19,509
Total current assets	1,106,421		999,785
Property and equipment, net	36,001		35,507
Right-of-use assets, operating leases	213,236		239,396
Investments in unconsolidated joint ventures	8,180		7,332
Goodwill	1,051,796		993,498
Intangible assets, net	9,160		13,943
Deferred tax assets	34,627		32,052
Other long-term assets	51,500		57,045
Total assets	$	2,510,921	$	2,378,558
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	132,602	$	111,804
Accrued compensation	193,185		199,801
Contract liabilities	179,127		171,905
Short-term lease liabilities, operating leases	64,911		69,650
Current portion of long-term debt and other short-term borrowings	16,252		49,264
Current contingent earn-out liabilities	16,320		16,142
Other current liabilities	208,951		174,890
Total current liabilities	811,348		793,456
Deferred tax liabilities	17,715		16,316
Long-term debt	234,020		242,395
Long-term lease liabilities, operating leases	173,080		191,955
Long-term contingent earn-out liabilities	14,904		16,475
Other long-term liabilities	67,359		80,588
Commitments and contingencies (Note 16)
Equity:
Preferred stock - authorized, 2,000 shares of $0.01 par value; no shares issued and outstanding at June 27, 2021 and September 27, 2020	—		—
Common stock - authorized, 150,000 shares of $0.01 par value; issued and outstanding, 54,071 and 53,797 shares at June 27, 2021 and September 27, 2020, respectively	541		538
Accumulated other comprehensive loss	(102,401)		(161,786)
Retained earnings	1,294,260		1,198,567
Tetra Tech stockholders’ equity	1,192,400		1,037,319
Noncontrolling interests	95		54
Total stockholders' equity	1,192,495		1,037,373
Total liabilities and stockholders' equity	$	2,510,921	$	2,378,558

See Notes to Consolidated Financial Statements.

3

Tetra Tech, Inc.

Consolidated Statements of Income

(unaudited – in thousands, except per share data)

 

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
Revenue	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Subcontractor costs	(163,590)		(149,494)		(478,461)		(482,768)
Other costs of revenue	(512,347)		(445,880)		(1,488,549)		(1,437,625)
Gross profit	125,696		114,397		354,490		321,134
Selling, general and administrative expenses	(55,859)		(50,822)		(157,788)		(148,299)
Contingent consideration – fair value adjustments	(30)		(50)		163		1,521
Income from operations	69,807		63,525		196,865		174,356
Interest expense	(2,737)		(3,564)		(8,585)		(10,412)
Income before income tax expense	67,070		59,961		188,280		163,944
Income tax expense	(15,146)		(14,458)		(38,380)		(34,710)
Net income	51,924		45,503		149,900		129,234
Net income attributable to noncontrolling interests	(21)		(6)		(44)		(29)
Net income attributable to Tetra Tech	$	51,903	$	45,497	$	149,856	$	129,205
Earnings per share attributable to Tetra Tech:
Basic	$	0.96	$	0.84	$	2.77	$	2.38
Diluted	$	0.95	$	0.83	$	2.74	$	2.34
Weighted-average common shares outstanding:
Basic	54,117		53,985		54,095		54,366
Diluted	54,666		54,692		54,698		55,161

See Notes to Consolidated Financial Statements.

4

Tetra Tech, Inc.

Consolidated Statements of Comprehensive Income

(unaudited – in thousands)

 

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
Net income	$	51,924	$	45,503	$	149,900	$	129,234
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	11,159		21,685		54,527		(11,428)
Gain (loss) on cash flow hedge valuations, net of tax	1,498		(30)		4,864		(5,726)
Other comprehensive income (loss), net of tax	12,657		21,655		59,391		(17,154)
Comprehensive income, net of tax	$	64,581	$	67,158	$	209,291	$	112,080
Comprehensive income attributable to noncontrolling interests, net of tax	23		2		50		23
Comprehensive income attributable to Tetra Tech, net of tax	$	64,558	$	67,156	$	209,241	$	112,057

See Notes to Consolidated Financial Statements.

5

Tetra Tech, Inc.

Consolidated Statements of Cash Flows

(unaudited – in thousands)

	Nine Months Ended
	June 27, 2021		June 28, 2020
Cash flows from operating activities:
Net income	$	149,900	$	129,234
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,811		19,066
Equity in income of unconsolidated joint ventures	(3,513)		(5,200)
Distributions of earnings from unconsolidated joint ventures	2,773		5,280
Amortization of stock-based awards	16,261		13,494
Deferred income taxes	123		2,767
Provision for losses on accounts receivables	(4,355)		539
Fair value adjustments to contingent consideration	(163)		(1,521)
Gain on sale of property and equipment	(110)		(9,693)
Changes in operating assets and liabilities, net of effects of business acquisitions:
Accounts receivable and contract assets	15,354		148,818
Prepaid expenses and other assets	17,243		1,566
Accounts payable	19,712		(98,029)
Accrued compensation	(7,332)		(39,978)
Contract liabilities	3,083		17,328
Other liabilities	1,389		10,305
Income taxes receivable/payable	(638)		574
Net cash provided by operating activities	226,538		194,550
Cash flows from investing activities:
Payments for business acquisitions, net of cash acquired	(17,154)		(28,505)
Capital expenditures	(6,234)		(9,360)
Proceeds from sale of property and equipment	333		17,162
Net cash used in investing activities	(23,055)		(20,703)
Cash flows from financing activities:
Proceeds from borrowings	165,570		298,364
Repayments on long-term debt	(173,895)		(297,856)
Bank overdrafts	(33,770)		—
Repurchases of common stock	(45,000)		(102,188)
Taxes paid on vested restricted stock	(17,589)		(11,143)
Stock options exercised	10,703		8,263
Dividends paid	(29,241)		(25,590)
Payments of contingent earn-out liabilities	(12,374)		(22,434)
Principal payments on finance leases	(1,908)		—
Net cash used in financing activities	(137,504)		(152,584)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	10,772		(334)
Net increase in cash, cash equivalents and restricted cash	76,751		20,929
Cash, cash equivalents and restricted cash at beginning of period	157,515		120,901
Cash, cash equivalents and restricted cash at end of period	$	234,266	$	141,830
Supplemental information:
Cash paid during the period for:
Interest	$	7,044	$	9,738
Income taxes, net of refunds received of $2.0 million and $1.4 million	$	36,664	$	30,259
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	234,266	$	141,658
Restricted cash	—		172
Total cash, cash equivalents and restricted cash	$	234,266	$	141,830

See Notes to Consolidated Financial Statements.

6

Tetra Tech, Inc.

Consolidated Statements of Stockholders' Equity

Three Months Ended June 28, 2020 and June 27, 2021

(unaudited – in thousands)

	Common Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Loss		Retained Earnings		Total Tetra Tech Equity		Non-Controlling Interests		Total Equity
	Shares	Amount
BALANCE AT MARCH 29, 2020	54,142	$	541	$	10,473	$	(199,391)	$	1,138,485	$	950,108	$	130	$	950,238
Net income								45,497		45,497		6		45,503
Other comprehensive income (loss)						21,659				21,659		(4)		21,655
Cash dividends of $0.17 per common share								(9,175)		(9,175)				(9,175)
Stock-based compensation				4,057						4,057				4,057
Restricted & performance shares released	(5)	—		(45)						(45)				(45)
Stock options exercised	14	—		336						336				336
Stock repurchases	(263)	(2)		(14,821)				$	(4,720)	(19,543)				(19,543)
BALANCE AT JUNE 28, 2020	53,888	$	539	$	—	$	(177,732)	$	1,170,087	$	992,894	$	132	$	993,026
BALANCE AT MARCH 28, 2021	54,158	$	542	$	—	$	(115,056)	$	1,261,661	$	1,147,147	$	81	$	1,147,228
Net income								51,903		51,903		21		51,924
Other comprehensive income						12,655				12,655		2		12,657
Distributions paid to noncontrolling interests										—		(9)		(9)
Cash dividends of $0.20 per common share								(10,831)		(10,831)				(10,831)
Stock-based compensation				5,695						5,695				5,695
Restricted & performance shares released	2	—		(101)						(101)				(101)
Stock options exercised	29	1		931						932				932
Stock repurchases	(118)	(2)		(6,525)				(8,473)		(15,000)				(15,000)
BALANCE AT JUNE 27, 2021	54,071	$	541	$	—	$	(102,401)	$	1,294,260	$	1,192,400	$	95	$	1,192,495

7

Tetra Tech, Inc.

Consolidated Statements of Stockholders' Equity

Nine months ended June 28, 2020 and June 27, 2021

(unaudited – in thousands)

	Common Stock			Additional Paid-in Capital		Accumulated Other Comprehensive Loss		Retained Earnings		Total Tetra Tech Equity		Non-Controlling Interests		Total Equity
	Shares	Amount
BALANCE AT SEPTEMBER 29, 2019	54,565	$	546	$	78,132	$	(160,584)	$	1,071,192	$	989,286	$	178	$	989,464
Net income								129,205		129,205		29		129,234
Other comprehensive loss						(17,148)				(17,148)		(6)		(17,154)
Distributions paid to noncontrolling interests										—		(69)		(69)
Cash dividends of $0.47 per common share								(25,590)		(25,590)				(25,590)
Stock-based compensation				13,494						13,494				13,494
Restricted & performance shares released	210	2		(11,145)						(11,143)				(11,143)
Stock options exercised	283	3		8,260						8,263				8,263
Shares issued for Employee Stock Purchase Plan	168	1		8,714						8,715				8,715
Stock repurchases	(1,338)	(13)		(97,455)				(4,720)		(102,188)				(102,188)
BALANCE AT JUNE 28, 2020	53,888	$	539	$	—	$	(177,732)	$	1,170,087	$	992,894	$	132	$	993,026
BALANCE AT SEPTEMBER 27, 2020	53,797	$	538	$	—	$	(161,786)	$	1,198,567	$	1,037,319	$	54	$	1,037,373
Net income								149,856		149,856		44		149,900
Other comprehensive income						59,385				59,385		6		59,391
Distributions paid to noncontrolling interests										—		(9)		(9)
Cash dividends of $0.54 per common share								(29,241)		(29,241)				(29,241)
Stock-based compensation				16,261						16,261				16,261
Restricted & performance shares released	213	2		(17,591)						(17,589)				(17,589)
Stock options exercised	304	4		10,699						10,703				10,703
Shares issued for Employee Stock Purchase Plan	124	1		10,705						10,706				10,706
Stock repurchases	(367)	(4)		(20,074)				(24,922)		(45,000)				(45,000)
BALANCE AT JUNE 27, 2021	54,071	$	541	$	—	$	(102,401)	$	1,294,260	$	1,192,400	$	95	$	1,192,495

See Notes to Consolidated Financial Statements.

8

TETRA TECH, INC.

Notes to Consolidated Financial Statements

1.                                      Basis of Presentation

The accompanying unaudited consolidated financial statements and related notes of Tetra Tech, Inc. (“we,” “us,” “our” or "Tetra Tech") have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. They do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and, therefore, should be read in conjunction with the audited consolidated financial statements and the notes contained in our Annual Report on Form 10-K for the fiscal year ended September 27, 2020.

These financial statements reflect all normal recurring adjustments that are considered necessary for a fair statement of our financial position, results of operations and cash flows for the interim periods presented. The results of operations and cash flows for any interim period are not necessarily indicative of results for the full year or for future years.

2.                                   Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board ("FASB") issued updated guidance, Accounting Standards Update ("ASU") 2016-13, related to the measurement of credit losses for certain financial assets. This guidance replaces the current incurred loss methodology with an expected credit loss methodology. It requires us to recognize an allowance equal to our current estimate of all contractual cash flows that we do not expect to collect. We adopted this guidance in the first quarter of fiscal 2021, and the adoption did not have a material impact on our consolidated financial statements. Our estimate considered relevant information about past events, current conditions, and reasonable and supportable forecasts impacting the collectability of the reported amounts.

In August 2018, the FASB issued updated guidance modifying certain fair value measurement disclosures. The guidance contains additional disclosures to enable users of the financial statements to better understand the entity’s assumptions used to develop significant unobservable inputs for Level 3 fair value measurements, but also eliminates the requirement for entities to disclose the amount of and reasons for transfers between Level 1 and Level 2 investments within the fair value hierarchy. We adopted this guidance in the first quarter of fiscal 2021, and the adoption did not have a material impact on our consolidated financial statements.

In December 2019, the FASB issued guidance simplifying the accounting for income taxes by removing certain exceptions to general principles in Topic 740 and amending certain existing guidance for clarity. This guidance is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2020 (first quarter of fiscal 2022 for us). Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In May 2020, the Securities and Exchange Commission issued guidance amending certain financial disclosures about acquired and disposed businesses. The amendments are designed to assist registrants in making more meaningful determinations of whether a subsidiary or an acquired or disposed business is significant, and to improve the related disclosure requirements. The guidance is effective for fiscal years beginning after December 31, 2020 (first quarter of fiscal 2022 for us). We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

3.                                   Revenue and Contract Balances

Disaggregation of Revenue

We disaggregate revenue by client sector and contract type, as we believe it best depicts how the nature, timing, and uncertainty of revenue and cash flows are affected by economic factors. The following tables present revenue disaggregated by client sector and contract type:

9

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Client Sector:
U.S. state and local government	$	135,717	$	97,163	$	390,464	$	324,670
U.S. federal government (1)	265,999		243,414		799,560		731,977
U.S. commercial	153,100		168,491		454,607		510,770
International (2)	246,817		200,703		676,869		674,110
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Contract Type:
Fixed-price	$	294,568	$	275,810	$	841,118	$	802,477
Time-and-materials	379,705		309,123		1,082,143		1,047,900
Cost-plus	127,360		124,838		398,239		391,150
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527

(1)     Includes revenue generated under U.S. federal government contracts performed outside the United States.

(2) Includes revenue generated from foreign operations, primarily in Canada, Australia, the United Kingdom, and revenue generated from non-U.S. clients.

Other than the U.S. federal government, no single client accounted for more than 10% of our revenue for the three and nine months ended June 27, 2021 and June 28, 2020.

Contract Assets and Contract Liabilities

We invoice customers based on the contractual terms of each contract. However, the timing of revenue recognition may differ from the timing of invoice issuance.

Contract assets represent revenue recognized in excess of the amounts for which we have the contractual right to bill our customers. Such amounts are recoverable from customers based upon various measures of performance, including achievement of certain milestones or completion of a contract. In addition, many of our time and materials arrangements are billed in arrears pursuant to contract terms that are standard within the industry, resulting in contract assets and/or unbilled receivables being recorded, as revenue is recognized in advance of billings. Contract retentions, included in contract assets, represent amounts withheld by clients until certain conditions are met or the project is completed, which may extend beyond one year.

Contract liabilities consist of billings in excess of revenue recognized. Contract liabilities decrease as we recognize revenue from the satisfaction of the related performance obligation and increase as billings in advance of revenue recognition occur. Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. There were no substantial non-current contract assets or liabilities for the periods presented. Net contract assets/liabilities consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Contract assets (1)	$	91,405	$	92,632
Contract liabilities	(179,127)		(171,905)
Net contract liabilities	$	(87,722)	$	(79,273)

(1)     Includes $8.5 million and $12.3 million of contract retentions as of June 27, 2021 and September 27, 2020, respectively.

10

In the first nine months of fiscal 2021 and 2020, we recognized revenue of approximately $108 million and $106 million, respectively, from amounts included in the contract liability balances at the end of fiscal 2020 and 2019, respectively.

We recognize revenue primarily using the cost-to-cost measure of progress to estimate progress towards completion. Changes in those estimates could result in the recognition of cumulative catch-up adjustments to the contract’s inception-to-date revenue, costs and profit in the period in which such changes are made. As a result, we recognized net favorable operating income adjustments of $1.7 million and $2.8 million in the third quarter and first nine months of fiscal 2021, respectively, compared to a net unfavorable adjustment of $2.8 million in the first nine months of fiscal 2020 (all in the second quarter). Changes in revenue and cost estimates could also result in a projected loss, determined at the contract level, which would be recorded immediately in earnings. As of June 27, 2021 and September 27, 2020, our consolidated balance sheets included liabilities for anticipated losses of $8.0 million and $13.2 million, respectively. The estimated cost to complete these related contracts as of June 27, 2021 and September 27, 2020 was approximately $81 million and $118 million, respectively.

Accounts Receivable, Net

Net accounts receivable consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Billed	$	431,613	$	402,818
Unbilled	236,174		253,364
Total accounts receivable	667,787		656,182
Allowance for doubtful accounts	(3,394)		(7,147)
Total accounts receivable, net	$	664,393	$	649,035

Billed accounts receivable represent amounts billed to clients that have not been collected. Unbilled accounts receivable, which represent an unconditional right to payment subject only to the passage of time, include unbilled amounts typically resulting from revenue recognized but not yet billed pursuant to contract terms or billed after the period end date. Substantially all of our unbilled receivables at June 27, 2021 are expected to be billed and collected within 12 months. The allowance for doubtful accounts represents amounts that are expected to become uncollectible or unrealizable in the future. We determine an estimated allowance for uncollectible accounts based on management's consideration of trends in the actual and forecasted credit quality of our clients, including delinquency and payment history; type of client, such as a government agency or a commercial sector client; and general economic and industry conditions, including the potential impacts of the coronavirus disease 2019 ("COVID-19") pandemic, that may affect our clients' ability to pay. The $3.8 million decline in our allowance for doubtful accounts in the first nine months of fiscal 2021 primarily reflects the collection of accounts receivable we previously determined were likely uncollectible related to our Canadian turn-key pipeline activities that we decided to dispose of in the fourth quarter of fiscal 2019.

Total accounts receivable at June 27, 2021 and September 27, 2020 included approximately $11 million for each period (all in our Remediation Construction Management ("RCM") segment), related to claims, including requests for equitable adjustment, on contracts that provide for price redetermination. Claims are amounts in excess of agreed contract prices that we seek to collect from our clients or other third parties for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price, or other causes of unanticipated additional costs. Factors considered in determining whether revenue associated with claims (including change orders in dispute and unapproved change orders in regards to both scope and price) should be recognized include the following: (a) the contract or other evidence provides a legal basis for the claim, (b) additional costs were caused by circumstances that were unforeseen at the contract date and not the result of deficiencies in our performance, (c) claim-related costs are identifiable and considered reasonable in view of the work performed, and (d) evidence supporting the claim is objective and verifiable. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period when a client agreement is obtained, or a claims resolution occurs.

We regularly evaluate all unsettled claim amounts and record appropriate adjustments to revenue when it is probable that the claim will result in a different contract value than the amount previously estimated. In the first nine months of fiscal 2021 (all in the second quarter), we recognized increases to revenue and related gains of $2.8 million in our Commercial/

11

International Services Group ("CIG"). In the first nine months of fiscal 2020, we recorded net losses in operating income related to claims of $4.4 million in our CIG segment.

No single client accounted for more than 10% of our accounts receivable at June 27, 2021 and September 27, 2020.

Remaining Unsatisfied Performance Obligations (“RUPOs”)

Our RUPOs represent a measure of the total dollar value of work to be performed on contracts awarded and in progress. We had $3.2 billion of RUPOs as of June 27, 2021. RUPOs increase with awards from new contracts or additions on existing contracts and decrease as work is performed and revenue is recognized on existing contracts. RUPOs may also decrease when projects are canceled or modified in scope. We include a contract within our RUPOs when the contract is awarded and an agreement on contract terms has been reached.

We expect to satisfy our RUPOs as of June 27, 2021 over the following periods:

	Amount
	(in thousands)
Within 12 months	$	1,950,987
Beyond	1,280,146
Total	$	3,231,133

Although RUPOs reflect business that is considered to be firm, cancellations, deferrals or scope adjustments may occur. RUPOs are adjusted to reflect any known project cancellations, revisions to project scope and cost, foreign currency exchange fluctuations and project deferrals, as appropriate. Our operations and maintenance contracts can generally be terminated by the clients without a substantive financial penalty. Therefore, the remaining performance obligations on such contracts are limited to the notice period required for the termination (usually 30, 60, or 90 days).

4.            Acquisitions

In the second quarter of fiscal 2021, we acquired Coanda Research and Development Corporation ("CRD"), based in Burnaby, British Columbia. CRD provides world-class expertise in computational fluid dynamics and utilizes industry-leading capabilities to solve complex engineering science problems for commercial customers, across a broad range of industries and is part of our CIG segment.

In the third quarter of fiscal 2021, we acquired The Kaizen Company (“KZN”) and IBRA-RMAC Automation Solutions (“IRM”). KZN is based in Washington, DC and provides international development advisory and management consulting services offering a suite of innovative tools that support advanced solutions in health, education, governance, peace and stability, and sustainable economic growth. IRM is based in San Diego, California, and provides digital water transformation consulting services and an innovative suite of tools to address complex water system modernization challenges. Both KZN and IRM are part of our Government Services Group ("GSG") segment.

The total fair value of the purchase price of these three acquisitions completed during the first nine months of fiscal 2021 was $29.1 million. This amount was comprised of $18.9 million in initial cash payments made to the sellers, and $10.2 million for the estimated fair value of contingent earn-out obligations, with a maximum of $19.0 million, based upon the achievement of specified operating income targets in each of the three to four years following the acquisition.

We acquired Segue Technologies, Inc. ("SEG"), a leading information technology management consulting firm based in Arlington, Virginia and BlueWater Federal Solutions, Inc. ("BWF"), a leading information technology management consulting firm based in Chantilly, Virginia in the second and fourth quarters of fiscal 2020, respectively. SEG and BWF are both part of our GSG segment. The total fair value of the purchase price for these two acquisitions was $88.6 million. This amount was comprised of $71.4 million in initial cash payments made to the sellers, $0.7 million of payables related to estimated post-closing adjustments for net assets acquired, and $16.5 million for the estimated fair value of contingent earn-out obligations, with a maximum of $28.0 million, based upon the achievement of specified operating income targets in each of the three years following the acquisitions.

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Goodwill additions resulting from the recent acquisitions of KZN, IRM and CRD are primarily attributable to the significant technical expertise residing in an embedded workforce that is sought out by clients, and the synergies expected to arise after the acquisitions. The fiscal 2020 goodwill additions represent the value of a workforce with distinct expertise in the high-end information technology field, in the areas of data analytics, modeling and simulation, cloud, and agile software development. In addition, these acquired capabilities, when combined with our existing global consulting and engineering business, result in opportunities that allow us to provide services under contracts that could not have been pursued individually by either us or the acquired companies. The results of these acquisitions were included in our consolidated financial statements from their respective closing dates. These acquisitions were not considered material, individually or in the aggregate, to our consolidated financial statements. As a result, no pro forma information has been provided.

Backlog, client relations and trade name intangible assets include the fair value of existing contracts and the underlying customer relationships with lives ranging from one to ten years, and trade names with lives ranging from three to five years. For detailed information regarding our intangible assets, see Note 5, “Goodwill and Intangible Assets”.

Most of our acquisition agreements include contingent earn-out agreements, which are generally based on the achievement of future operating income thresholds. The contingent earn-out arrangements are based on our valuations of the acquired companies and reduce the risk of overpaying for acquisitions if the projected financial results are not achieved. The fair values of any earn-out arrangements are included as part of the purchase price of the acquired companies on their respective acquisition dates. For each transaction, we estimate the fair value of contingent earn-out payments as part of the initial purchase price and record the estimated fair value of contingent consideration as a liability in “Current contingent earn-out liabilities” and “Long-term contingent earn-out liabilities” on the consolidated balance sheets. We consider several factors when determining that contingent earn-out liabilities are part of the purchase price, including the following: (1) the valuation of our acquisitions is not supported solely by the initial consideration paid, and the contingent earn-out formula is a critical and material component of the valuation approach to determining the purchase price; and (2) the former owners of acquired companies that remain as key employees receive compensation other than contingent earn-out payments at a reasonable level compared with the compensation of our other key employees. The contingent earn-out payments are not affected by employment termination.

We measure our contingent earn-out liabilities at fair value on a recurring basis using significant unobservable inputs classified within Level 3 of the fair value hierarchy. We use a probability-weighted discounted income approach as a valuation technique to convert future estimated cash flows to a single present value amount. The significant unobservable inputs used in the fair value measurements are operating income projections over the earn-out period (generally two or three years), and the probability outcome percentages we assign to each scenario. Significant increases or decreases to either of these inputs in isolation would result in a significantly higher or lower liability, with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liability will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. The amount paid that is less than or equal to the contingent earn-out liability on the acquisition date is reflected as cash used in financing activities in our consolidated statements of cash flows. Any amount paid in excess of the contingent earn-out liability on the acquisition date is reflected as cash used in operating activities in our consolidated statements of cash flows.

We evaluated our estimated fair value of contingent consideration liabilities for each individual acquisition on a quarterly basis, which included a review of their financial results to-date, the status of ongoing projects in their RUPOs, and the inventory of prospective new contract awards. We also considered the potential impact of the global economic disruption due to the COVID-19 pandemic on our operating income projections over the various earn-out periods. The updated fair value could differ materially from the initial estimates. Changes in the estimated fair value of our contingent earn-out liabilities related to the time component of the present value calculation are reported in interest expense. During the first nine months of fiscal 2021 and 2020, we recorded adjustments to our contingent earn-out liabilities and reported a net gain in operating income of $0.2 million and $1.5 million, respectively (substantially all in the second quarters of fiscal 2021 and 2020).

At June 27, 2021, there was a total potential maximum of $68.2 million of outstanding contingent consideration related to acquisitions. Of this amount, $31.2 million was estimated as the fair value and accrued on our consolidated balance sheet. If the global economic disruption related to the COVID-19 pandemic is prolonged, we could have significant reductions in our contingent earn-out liabilities and related gains in our operating income in future periods.

Subsequent Event. On July 26, 2021, we acquired Hoare Lea, a leader in sustainable engineering design. Based in Bristol, United Kingdom, Hoare Lea was established in 1862 and is an award-winning high-end consultancy firm in the United Kingdom, with more than 900 employees, providing innovative solutions to complex engineering and design challenges for sustainable infrastructure and high performance buildings. Hoare Lea will be included in our CIG segment.

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5.            Goodwill and Intangible Assets

The following table summarizes the changes in the carrying value of goodwill by reportable segment:

	GSG		CIG		Total
	(in thousands)
Balance at September 27, 2020	$	516,315	$	477,183	$	993,498
Acquisition activity	14,891		3,675		18,566
Translation	10,099		29,633		39,732
Balance at June 27, 2021	$	541,305	$	510,491	$	1,051,796

Our goodwill balances reflect foreign currency translation adjustments related to our foreign subsidiaries with functional currencies that are different than our reporting currency. These amounts are presented net of reductions from historical impairment adjustments. The gross amounts of goodwill for GSG were $559.0 million and $534.0 million at June 27, 2021 and September 27, 2020, respectively, excluding accumulated impairment of $17.7 million for each period. The gross amounts of goodwill for CIG were $632.0 million and $598.7 million at June 27, 2021 and September 27, 2020, respectively, excluding accumulated impairment of $121.5 million for each period.

We perform our annual goodwill impairment review at the beginning of our fiscal fourth quarter. Our most recent annual review at June 29, 2020 (i.e. the first day of our fourth quarter in fiscal 2020) indicated that we had no impairment of goodwill, and all of our reporting units had estimated fair values that were in excess of their carrying values, including goodwill. All of our reporting units had estimated fair values that exceeded their carrying values by more than 80%, with the exception of our former Asia/Pacific ("ASP") reporting unit, which was in our CIG reportable segment. Our former ASP reporting unit had an estimated fair value that exceeded its carrying value by less than 20%.

We also regularly evaluate whether events and circumstances have occurred that may indicate a potential change in the recoverability of goodwill. We perform interim goodwill impairment reviews between our annual reviews if certain events and circumstances have occurred, such as a deterioration in general economic conditions; an increase in the competitive environment; a change in management, key personnel, strategy or customers; negative or declining cash flows; or a decline in actual or planned revenue or earnings compared with actual and projected results of relevant prior periods. Although we believe that our estimates of fair value for these reporting units are reasonable, if financial performance for these reporting units falls significantly below our expectations or market prices for similar business decline, the goodwill for these reporting units could become impaired.    

On September 2, 2020, Australia announced that it had fallen into economic recession, defined as two consecutive quarters of negative growth, for the first time since 1991 including 7% negative growth in the quarter ending June 30, 2020. This prompted a strategic review of our former ASP reporting unit. As a result of the economic recession in Australia, our revenue growth and profit margin forecasts for our former ASP reporting unit declined from the previous forecast used for our annual goodwill impairment review as of June 29, 2020. We also performed an interim goodwill impairment review of our former ASP reporting unit in September 2020 and recorded a $15.8 million goodwill impairment charge. As a result of the impairment charge, the estimated fair value of our former ASP reporting unit equaled its carrying value of $144.9 million, including $95.5 million of goodwill, at September 27, 2020. On September 28, 2020 (the first day of our fiscal 2021), we merged our former ASP reporting unit into our Client Account Management reporting unit.

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The following table presents the gross amount and accumulated amortization of our acquired identifiable intangible assets with finite useful lives included in “Intangible assets, net” on the consolidated balance sheets:

	June 27, 2021					September 27, 2020
	Weighted- Average Remaining Life (in Years)	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
	($ in thousands)
Client relations	2.5	$	48,444	$	(42,587)	$	60,775	$	(53,392)
Backlog	0.7	32,292		(30,027)		37,682		(32,761)
Trade names	1.6	7,162		(6,124)		7,964		(6,325)
Total		$	87,898	$	(78,738)	$	106,421	$	(92,478)

Amortization expense for the three and nine months ended June 27, 2021 was $2.2 million and $7.8 million, respectively, compared to $2.6 million and $9.0 million for the prior-year periods. Estimated amortization expense for the remainder of fiscal 2021 and succeeding years is as follows:

	Amount
	(in thousands)
2021	$	2,093
2022	4,072
2023	2,138
2024	754
2025	103
Total	$	9,160

6.                                     Property and Equipment

Property and equipment consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Equipment, furniture and fixtures	$	98,289	$	90,942
Leasehold improvements	36,280		34,569
Total property and equipment	134,569		125,511
Accumulated depreciation	(98,568)		(90,004)
Property and equipment, net	$	36,001	$	35,507

The depreciation expense related to property and equipment was $3.1 million and $9.0 million for the three and nine months ended June 27, 2021, respectively, compared to $3.7 million and $10.1 million for the prior-year periods.

7.                                     Stock Repurchase and Dividends

On January 27, 2020, the Board of Directors authorized a new $200 million stock repurchase program, which was included in our remaining balance of $207.8 million as of fiscal 2020 year-end. In the first nine months of fiscal 2021, we repurchased and settled 368,177 shares with an average price of $122.22 per share for a total cost of $45.0 million in the open market. At June 27, 2021, we had a remaining balance of $162.8 million under our stock repurchase program.

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The following table presents dividends declared and paid in the first nine months of fiscal 2021 and 2020:

Declare Date	Dividend Paid Per Share		Record Date	Payment Date	Dividend Paid (in thousands)
November 9, 2020	$	0.17	November 30, 2020	December 11, 2020	$	9,198
January 25, 2021	$	0.17	February 10, 2021	February 26, 2021	9,212
April 26, 2021	$	0.20	May 12, 2021	May 28, 2021	10,831
Total dividend paid as of June 27, 2021					$	29,241
November 11, 2019	$	0.15	December 2, 2019	December 13, 2019	$	8,190
January 27, 2020	$	0.15	February 12, 2020	February 28, 2020	8,225
April 27, 2020	$	0.17	May 13, 2020	May 29, 2020	9,175
Total dividend paid as of June 28, 2020					$	25,590

Subsequent Event.  On July 26, 2021, the Board of Directors declared a quarterly cash dividend of $0.20 per share payable on September 3, 2021 to stockholders of record as of the close of business on August 20, 2021.

8.                                     Leases

In February 2016, the FASB issued ASU 2016-02 “Leases (Topic 842)”, which is a new standard related to leases to increase transparency and comparability among organizations by requiring the recognition of right-of-use (“ROU”) assets obtained in exchange for lease liabilities on the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases.

We elected to adopt the standard, and available practical expedients, effective September 30, 2019 (the first day of our fiscal 2020). These practical expedients allowed us to keep the lease classification assessed under the previous lease accounting standard (ASC 840) without reassessment under the new standard, and allowed all separate lease components, including non-lease components, to be accounted for as a single lease component for all existing leases prior to adoption of the new standard.

We adopted this new standard under the modified retrospective transition approach without adjusting comparative periods in the financial statements, as allowed under Leases (Topic 842), and implemented internal controls and key system functionality to enable the preparation of financial information on adoption. The standard had a material impact on our consolidated balance sheets but did not have an impact on the consolidated income statements. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases, while accounting for finance leases remained substantially unchanged. Our finance leases are primarily for certain information technology equipment and the related ROU and lease liabilities were immaterial, and included in "Other current liabilities" and "Other long-term liabilities" accordingly on our consolidated balance sheets at June 27, 2021 and September 27, 2020.

We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets and current and long-term operating lease liabilities in the consolidated balance sheets.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, incremental borrowing rates are used based on the information available at commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for operating lease payments is recognized on a straight-line basis over the lease term.

Our operating leases are primarily for corporate and project office spaces. To a much lesser extent, we have operating leases for vehicles and equipment. Our operating leases have remaining lease terms of one month to twelve years, some of which may include options to extend the leases for up to five years.

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The components of lease costs are as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating lease cost	$	22,423	$	21,152	$	67,132	$	63,919
Sublease income	(21)		(573)		(81)		(1,688)
Other	—		18		—		54
Total lease cost	$	22,402	$	20,597	$	67,051	$	62,285

Supplemental cash flow information related to leases is as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating cash flows for operating leases	$	20,217	$	18,634	$	56,616	$	60,138
Right-of-use assets obtained in exchange for new operating lease liabilities	$	9,672	$	7,505	$	43,394	$	305,141

Supplemental balance sheet and other information related to leases are as follows:

	Balance at
	June 27, 2021			September 27, 2020
	(in thousands)
Operating leases:
Right-of-use assets	$	213,236		$	239,396
Lease liabilities:
Current	64,911			69,650
Long-term	173,080			191,955
Total operating lease liabilities	$	237,991		$	261,605
Weighted-average remaining lease term:
Operating leases	5 years			5 years
Weighted-average discount rate:
Operating leases	2.3		%	2.5		%

As of June 27, 2021, we do not have any material additional operating leases that have not yet commenced.

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A maturity analysis of the future undiscounted cash flows associated with our operating lease liabilities is as follows:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
2021	$	18,813	$	75,074
2022	70,378		64,972
2023	49,755		44,733
2024	36,221		30,991
2025	26,810		21,466
Beyond	52,411		44,169
Total lease payments	254,388		281,405
Less: imputed interest	(16,397)		(19,800)
Total present value of lease liabilities	$	237,991	$	261,605

9.                                     Stockholders’ Equity and Stock Compensation Plans

We recognize the fair value of our stock-based awards as compensation expense on a straight-line basis over the requisite service period in which the award vests. Stock-based compensation expense for the three and nine months ended June 27, 2021 was $5.7 million and $16.3 million, respectively, compared to $4.1 million and $13.5 million for the same periods last year. Most of these amounts were included in selling, general and administrative expenses on our consolidated statements of income. In the first nine months of fiscal 2021, we awarded 57,542 performance share units (“PSUs”) (all in the first quarter) to our non-employee directors and executive officers at a fair value of $153.03 per share on the award date. All PSUs are performance-based and vest, if at all, after the conclusion of the three-year performance period. The number of PSUs that ultimately vest is based 50% on the growth in our diluted earnings per share and 50% on our relative total shareholder return over the vesting period. Additionally, we awarded 117,084 restricted stock units (“RSUs”) to our non-employee directors, executive officers and employees at a fair value of $121.97 per share on the award date. All executive officer and employee RSUs have time-based vesting over a four-year period, and the non-employee director RSUs vest after one year.

10.                                Earnings per Share (“EPS”)

Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding, less unvested restricted stock for the period. Diluted EPS is computed by dividing net income by the weighted-average number of common shares outstanding and dilutive potential common shares for the period. Potential common shares include the weighted-average dilutive effects of outstanding stock options and unvested restricted stock using the treasury stock method.

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The following table presents the number of weighted-average shares used to compute basic and diluted EPS:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	51,903	$	45,497	$	149,856	$	129,205
Weighted-average common shares outstanding – basic	54,117		53,985		54,095		54,366
Effect of dilutive stock options and unvested restricted stock	549		707		603		795
Weighted-average common shares outstanding – diluted	54,666		54,692		54,698		55,161
Earnings per share attributable to Tetra Tech:
Basic	$	0.96	$	0.84	$	2.77	$	2.38
Diluted	$	0.95	$	0.83	$	2.74	$	2.34

11.                                  Income Taxes

The effective tax rates for the first nine months of fiscal 2021 and 2020 were 20.4% and 21.2%, respectively. Income tax expense was reduced by $8.7 million and $7.0 million of excess tax benefits on share-based payments in the first nine months of fiscal 2021 and 2020, respectively. Excluding the impact of the excess tax benefits on share-based payments, our effective tax rates in the first nine months fiscal 2021 and 2020 were 25.0% and 25.4%, respectively.

As of June 27, 2021 and September 27, 2020, the liability for income taxes associated with uncertain tax positions was $12.8 million and $9.7 million, respectively. These uncertain tax positions substantially relate to ongoing examinations, which are not likely to be resolved within the next 12 months. These liabilities represent our current estimates of the additional tax liabilities that we may be assessed when the related audits are concluded. If these audits are resolved in a manner more unfavorable than our current expectations, our additional tax liabilities could be materially higher than the amounts currently recorded resulting in additional tax expense.

12.                               Reportable Segments

We manage our operations under two reportable segments. Our GSG reportable segment primarily includes activities with U.S. government clients (federal, state and local) and all activities with development agencies worldwide. Our CIG reportable segment primarily includes activities with U.S. commercial clients and international clients other than development agencies. Additionally, we continue to report the results of the wind-down of our non-core construction activities in the RCM reportable segment. Substantially, there has been no remaining backlog for RCM since fiscal 2018 as the projects were complete.

GSG provides consulting and engineering services primarily to U.S. government clients (federal, state and local) and development agencies worldwide. GSG supports U.S. government civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology, and disaster management. GSG also provides engineering design services for U.S. municipal and commercial clients, especially in water infrastructure, solid waste, and high-end sustainable infrastructure designs. GSG also leads our support for development agencies worldwide, especially in the United States, United Kingdom, and Australia.

CIG primarily provides consulting and engineering services to U.S. commercial clients, and international clients that include both commercial and government sectors. CIG supports commercial clients across the Fortune 500, renewable energy, industrial, manufacturing, and aerospace markets. CIG also provides sustainable infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), the United Kingdom, as well as Brazil and Chile.

Management evaluates the performance of these reportable segments based upon their respective segment operating income before the effect of amortization expense related to acquisitions, and other unallocated corporate expenses. We account

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for inter-segment revenues and transfers as if they were to third parties; that is, by applying a negotiated fee onto the costs of the services performed. All significant intercompany balances and transactions are eliminated in consolidation.

The following tables summarize financial information regarding our reportable segments:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Revenue
GSG	$	488,700	$	432,180	$	1,431,151	$	1,326,487
CIG	327,434		291,021		931,586		950,597
RCM	143		48		613		198
Elimination of inter-segment revenue	(14,644)		(13,478)		(41,850)		(35,755)
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Income from operations
GSG	$	49,297	$	43,100	$	143,106	$	120,495
CIG	34,017		28,848		89,886		82,156
RCM	—		(1)		1		—
Corporate (1)	(13,507)		(8,422)		(36,128)		(28,295)
Total	$	69,807	$	63,525	$	196,865	$	174,356

(1) Includes amortization of intangibles, other costs and other income not allocable to our reportable segments.

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Total Assets
GSG	$	642,830	$	649,417
CIG	470,009		479,238
RCM	11,760		14,258
Corporate (1)	1,386,322		1,235,645
Total	$	2,510,921	$	2,378,558

(1) Corporate assets consist of intercompany eliminations and assets not allocated to our reportable segments including goodwill, intangible assets, deferred income taxes and certain other assets.

13.                               Fair Value Measurements

The fair value of long-term debt was determined using the present value of future cash flows based on the borrowing rates currently available for debt with similar terms and maturities (Level 2 measurement, as described in “Critical Accounting Policies and Estimates” in our Annual Report on Form 10-K for the fiscal year ended September 27, 2020). The carrying value of our long-term debt approximated fair value at June 27, 2021 and September 27, 2020. At June 27, 2021, we had borrowings of $246.5 million outstanding under our Amended Credit Agreement, which were used to fund business acquisitions, working capital needs, stock repurchases, dividends, capital expenditures and contingent earn-outs.

14.                               Derivative Financial Instruments

We often use certain interest rate derivative contracts to hedge interest rate exposures on our variable rate debt. Also, we may enter in foreign currency derivative contracts with financial institutions to reduce the risk that cash flows and earnings could adversely be affected by foreign currency exchange rate fluctuations. Our hedging program is not designated for trading or speculative purposes.

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We recognize derivative instruments as either assets or liabilities on the accompanying consolidated balance sheets at fair value. We record changes in the fair value (i.e., gains or losses) of the derivatives that have been designated as cash flow hedges in our consolidated balance sheets as accumulated other comprehensive income, and in our consolidated statements of income for those derivatives designated as fair value hedges.

In fiscal 2018, we entered into five interest rate swap agreements that we designated as cash flow hedges to fix the interest rate on the borrowings under our term loan facility. As of June 27, 2021, the notional principal of our outstanding interest swap agreements was $218.8 million ($43.8 million each.) The interest rate swaps have a fixed interest rate of 2.79% and expire in July 2023 for all five agreements. At June 27, 2021 and September 27, 2020, the fair value of the effective portion of our interest rate swap agreements designated as cash flow hedges before tax effect was $(10.6) million and $(15.5) million, which were reported in "Other current liabilities" on our consolidated balance sheets. Additionally, the related gains of $1.5 million and $4.9 million for the three and nine months ended June 27, 2021, respectively, compared to related losses of $0.0 million and $5.7 million for the prior-year periods, were recognized and reported on our consolidated statements of comprehensive income. We expect to reclassify $5.7 million from accumulated other comprehensive loss to interest expense within the next twelve months. There were no other derivative instruments designated as hedging instruments for the first nine months of fiscal 2021.

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15.                               Reclassifications Out of Accumulated Other Comprehensive Income

The accumulated balances and activities for the three and nine months ended June 27, 2021 and June 28, 2020 related to reclassifications out of accumulated other comprehensive income are summarized as follows:

	Three Months Ended
	Foreign Currency Translation Adjustments		Gain (Loss) on Derivative Instruments		Accumulated Other Comprehensive Income (Loss)
	(in thousands)
Balance at March 29, 2020	$	(182,822)	$	(16,569)	$	(199,391)
Other comprehensive income before reclassifications	21,689		1,279		22,968
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(1,309)		(1,309)
Net current-period other comprehensive income (loss)	21,689		(30)		21,659
Balance at June 28, 2020	$	(161,133)	$	(16,599)	$	(177,732)
Balance at March 28, 2021	$	(102,911)	$	(12,145)	$	(115,056)
Other comprehensive income before reclassifications	11,157		2,981		14,138
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(1,483)		(1,483)
Net current-period other comprehensive income	11,157		1,498		12,655
Balance at June 27, 2021	$	(91,754)	$	(10,647)	$	(102,401)
	Nine Months Ended
	Foreign Currency Translation Adjustments		Gain (Loss) on Derivative Instruments		Accumulated Other Comprehensive Income (Loss)
	(in thousands)
Balance at September 29, 2019	$	(149,711)	$	(10,873)	$	(160,584)
Other comprehensive loss before reclassifications	(11,422)		(3,200)		(14,622)
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(2,526)		(2,526)
Net current-period other comprehensive loss	(11,422)		(5,726)		(17,148)
Balance at June 28, 2020	$	(161,133)	$	(16,599)	$	(177,732)
Balance at September 27, 2020	$	(146,275)	$	(15,511)	$	(161,786)
Other comprehensive income before reclassifications	54,521		9,341		63,862
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(4,477)		(4,477)
Net current-period other comprehensive income	54,521		4,864		59,385
Balance at June 27, 2021	$	(91,754)	$	(10,647)	$	(102,401)
(1) This accumulated other comprehensive component is reclassified to “Interest expense” in our consolidated statements of income. See Note 14, “Derivative Financial Instruments”, for more information.

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16.                               Commitments and Contingencies

We are subject to certain claims and lawsuits typically filed against the consulting and engineering profession, alleging primarily professional errors or omissions. We carry professional liability insurance, subject to certain deductibles and policy limits, against such claims. However, in some actions, parties are seeking damages that exceed our insurance coverage or for which we are not insured. While management does not believe that the resolution of these claims will have a material adverse effect, individually or in aggregate, on our financial position, results of operations or cash flows, management acknowledges the uncertainty surrounding the ultimate resolution of these matters.

On July 15, 2019, following an initial January 14, 2019 filing, the Civil Division of the United States Attorney's Office filed an amended complaint in intervention in three qui tam actions filed against our subsidiary, Tetra Tech EC, Inc. ("TtEC"), in the U.S. District Court for the Northern District of California. The complaint alleges False Claims Act violations and breach of contract related to TtEC's contracts to perform environmental remediation services at the former Hunters Point Naval Shipyard in San Francisco, California. TtEC disputes the claims and will defend this matter vigorously. We are currently unable to determine the probability of the outcome of this matter or the range of reasonably possible loss, if any.

17.                               Related Party Transactions

We often provide services to unconsolidated joint ventures. Revenue generated from the services we provided to unconsolidated joint ventures for the three and nine months of fiscal 2021 was $24.2 million and $69.8 million, respectively, compared to $19.0 million and $67.0 million for the same periods last year. Related reimbursable costs for the three and nine months of fiscal 2021 were $23.2 million and $67.2 million, respectively, compared to $18.4 million and $66.0 million for the same periods last year. Our consolidated balance sheets also included the following amounts related to these services:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Accounts receivable, net	$	21,102	$	20,884
Contract assets	4,669		3,261
Contract liabilities	2,709		478

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Item 2.         Management’s Discussion and Analysis of Financial Condition and Results of Operations

 FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q, including the “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” contains forward-looking statements regarding future events and our future results that are subject to the safe harbor provisions created under the Securities Act of 1933 and the Securities Exchange Act of 1934. All statements other than statements of historical facts are statements that could be deemed forward-looking statements. These statements are based on current expectations, estimates, forecasts and projections about the industries in which we operate and the beliefs and assumptions of our management. Words such as “expects,” “anticipates,” “targets,” “goals,” “projects,” “intends,” “plans,” “believes,” “estimates,” “seeks,” “continues,” “may,” variations of such words, and similar expressions are intended to identify such forward-looking statements. In addition, statements that refer to projections of our future financial performance, our anticipated growth and trends in our businesses, and other characterizations of future events or circumstances are forward-looking statements. Readers are cautioned that these forward-looking statements are only predictions and are subject to risks, uncertainties and assumptions that are difficult to predict, including those identified below under “Part II, Item 1A. Risk Factors,” and elsewhere herein. Therefore, actual results may differ materially and adversely from those expressed in any forward-looking statements. We undertake no obligation to revise or update publicly any forward-looking statements for any reason.

GENERAL OVERVIEW

Tetra Tech, Inc. is a leading global provider of consulting and engineering services that focuses on water, environment, sustainable infrastructure, renewable energy, and international development. We are a global company that is Leading with Science® to provide innovative solutions for our public and private clients. We typically begin at the earliest stage of a project by identifying technical solutions and developing execution plans tailored to our clients' needs and resources.

Our reputation for high-end consulting and engineering services and our ability to develop solutions for water and environmental management has supported our growth for more than 55 years. Today, we are proud to be making a difference in people’s lives worldwide through broad consulting, engineering, and technology service offerings. We work on over 65,000 projects, in more than 100 countries on seven continents, with a talent force of 21,000 associates. We are Leading with Science® throughout our operations, with domain experts across multiple disciplines supported by our advanced analytics, artificial intelligence, machine learning, and digital technology solutions. Our ability to provide innovation and first-of-kind solutions is enhanced by partnerships with our forward-thinking clients. We are diverse and inclusive, embracing the breadth of experience across our talented workforce worldwide with a culture of innovation and entrepreneurship. We are disciplined in our business delivering value to customers and high performance to our shareholders. In supporting our clients, we seek to add value and provide long-term sustainable consulting, engineering, and technology solutions.

By combining ingenuity and practical experience, we have helped to advance sustainable solutions for managing water, protecting the environment, providing energy, and engineering the infrastructure for our cities and communities.

We derive income from fees for professional, technical, program management, and construction management services. As primarily a professional services company, we are labor-intensive rather than capital-intensive. Our revenue is driven by our ability to attract and retain qualified and productive employees, identify business opportunities, secure new and renew existing client contracts, provide outstanding services to our clients and execute projects successfully. We provide services to a diverse base of U.S. state and local government, U.S. federal government, U.S. commercial, and international clients.

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The following table presents the percentage of our revenue by client sector:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
Client Sector
U.S. state and local government	16.9	%	13.7	%	16.8	%	14.4	%
U.S. federal government (1)	33.2		34.3		34.4		32.7
U.S. commercial	19.1		23.7		19.6		22.8
International (2)	30.8		28.3		29.2		30.1
Total	100.0	%	100.0	%	100.0	%	100.0	%

(1)     Includes revenue generated under U.S. federal government contracts performed outside the United States.

(2)    Includes revenue generated from foreign operations, primarily in Canada, Australia, the United Kingdom, and revenue generated from non-U.S. clients.

We manage our operations under two reportable segments. Our Government Services Group ("GSG") reportable segment primarily includes activities with U.S. government clients (federal, state and local) and all activities with development agencies worldwide. Our Commercial/International Services Group ("CIG") reportable segment primarily includes activities with U.S. commercial clients and international clients other than development agencies. Additionally, we continue to report the results of the wind-down of our non-core construction activities in the Remediation and Construction Management ("RCM") reportable segment. Substantially, there has been no remaining backlog for RCM since fiscal 2018 as the projects were complete.

Government Services Group (“GSG”).  GSG provides consulting and engineering services primarily to U.S. government clients (federal, state and local) and development agencies worldwide. GSG supports U.S. government civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology, and disaster management. GSG also provides engineering design services for U.S. municipal and commercial clients, especially in water infrastructure, solid waste, and high-end sustainable infrastructure designs. GSG also leads our support for development agencies worldwide, especially in the United States, United Kingdom, and Australia.

Commercial/International Services Group (“CIG”).  CIG primarily provides consulting and engineering services to U.S. commercial clients, and international clients that include both commercial and government sectors. CIG supports commercial clients across the Fortune 500, renewable energy, industrial, manufacturing, and aerospace markets. CIG also provides sustainable infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), the United Kingdom, as well as Brazil and Chile.

The following table presents the percentage of our revenue by reportable segment:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
Reportable Segment
GSG	61.0	%	60.9	%	61.7	%	59.2	%
CIG	40.8		41.0		40.1		42.4
Inter-segment elimination	(1.8)		(1.9)		(1.8)		(1.6)
Total	100.0	%	100.0	%	100.0	%	100.0	%

Our services are performed under three principal types of contracts with our clients: fixed-price, time-and-materials, and cost-plus. The following table presents the percentage of our revenue by contract type:

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	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
Contract Type
Fixed-price	36.7	%	38.9	%	36.2	%	35.8	%
Time-and-materials	47.4		43.5		46.6		46.7
Cost-plus	15.9		17.6		17.2		17.5
Total	100.0	%	100.0	%	100.0	%	100.0	%

Under fixed-price contracts, clients agree to pay a specified price for our performance of the entire contract or a specified portion of the contract. Under time-and-materials contracts, we are paid for labor at negotiated hourly billing rates and paid for other expenses. Under cost-plus contracts, some of which are subject to a contract ceiling amount, we are reimbursed for allowable costs plus fees, which may be fixed or performance-based. Profitability on these contracts is driven by billable headcount and our cost control. We recognize revenue from contracts using the cost-to-cost measure of progress method to estimate the progress towards completion to determine the amount of revenue and profit to recognize. Changes in those estimates could result in the recognition of cumulative catch-up adjustments to the contract’s inception-to-date revenue, costs and profit in the period in which such changes are made. On a quarterly basis, we review and assess our revenue and cost estimates for each significant contract. Changes in revenue and cost estimates could also result in a projected loss that would be recorded immediately in earnings.

Other contract costs include professional compensation and related benefits, together with certain direct and indirect overhead costs such as rents, utilities, and travel. Professional compensation represents a large portion of these costs. Our "Selling, general and administrative expenses" ("SG&A") are comprised primarily of marketing and bid and proposal costs, and our corporate headquarters’ costs related to the executive offices, finance, accounting, administration, and information technology. Our SG&A expenses also include a portion of stock-based compensation and depreciation of property and equipment related to our corporate headquarters, and the amortization of identifiable intangible assets. Most of these costs are unrelated to specific clients or projects, and can vary as expenses are incurred to support company-wide activities and initiatives.

We experience seasonal trends in our business.  Our revenue and operating income are typically lower in the first half of our fiscal year, primarily due to the Thanksgiving (in the U.S.), Christmas, and New Year’s holidays. Many of our clients’ employees, as well as our own employees, take vacations during these holiday periods. Further, seasonal inclement weather conditions occasionally cause some of our offices to close temporarily or may hamper our project field work in the northern hemisphere's temperate and arctic regions. These occurrences result in fewer billable hours worked on projects and, correspondingly, less revenue recognized.

ACQUISITIONS AND DIVESTITURES

Acquisitions.  We continuously evaluate the marketplace for acquisition opportunities to further our strategic growth plans. Due to our reputation, size, financial resources, geographic presence and range of services, we have numerous opportunities to acquire privately and publicly held companies or selected portions of such companies. We evaluate an acquisition opportunity based on its ability to strengthen our leadership in the markets we serve, the technologies and solutions they provide, and the additional new geographies and clients they bring. Also, during our evaluation, we examine an acquisition's ability to drive organic growth, its accretive effect on long-term earnings, and its ability to generate return on investment. Generally, we proceed with an acquisition if we believe that it will strategically expand our service offerings, improve our long-term financial performance, and increase shareholder returns.

We view acquisitions as a key component in the execution of our growth strategy, and we intend to use cash, debt or equity, as we deem appropriate, to fund acquisitions. We may acquire other businesses that we believe are synergistic and will ultimately increase our revenue and net income, strengthen our ability to achieve our strategic goals, provide critical mass with existing clients, and further expand our lines of service. We typically pay a purchase price that results in the recognition of goodwill, generally representing the intangible value of a successful business with an assembled workforce specialized in our areas of interest. Acquisitions are inherently risky, and no assurance can be given that our previous or future acquisitions will be successful or will not have a material adverse effect on our financial position, results of operations, or cash flows. All acquisitions require the approval of our Board of Directors. For detailed information regarding acquisitions, see Note 4, “Acquisitions” of the “Notes to Consolidated Financial Statements”.

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 Divestitures.  We regularly review and evaluate our existing operations to determine whether our business model should change through the divestiture of certain businesses. Accordingly, from time to time, we may divest or wind-down certain non-core businesses and reallocate our resources to businesses that better align with our long-term strategic direction.

OVERVIEW OF RESULTS AND BUSINESS TRENDS

General. As the coronavirus disease 2019 ("COVID-19") spread globally, we responded quickly to ensure the health and safety of our employees, clients and the communities we support. Our high-end consulting focus and the technologies we deployed have allowed our staff to support clients and projects remotely without interruption. We remain focused on providing clients with the highest level of service and our 450 global offices are operational, supporting our programs and projects. By Leading with Science®, we are responding to the challenges of COVID-19, with the commitment of our 21,000 staff supported by technological innovation. Our government business, which represents approximately 60% of our revenue, has been stable, while our commercial business experienced relatively more impact. Much of our commercial business has continued due to regulatory drivers, but we have seen project delays in the industrial sectors. Our diversified end-markets have allowed us to redeploy staff to areas of uninterrupted or increased demand, and we have made decisions to align our cost structures with our clients' projects. The actions we have taken to navigate through this worldwide pandemic, the strength of our balance sheet, and our technical leadership position us well to address the global challenges of providing clean water, environmental restoration, and the impacts of climate change.

In the first nine months of fiscal 2021, revenue increased 3.6% compared to the prior-year period. Our revenue includes contributions from acquisitions that did not contribute to our revenue in the first nine months of fiscal 2020. Our year-over-year revenue comparisons were also impacted by the decision to dispose of our Canadian turn-key pipeline activities in the fourth quarter of fiscal 2019 and the subsequent wind-down of those activities in fiscal 2020, which included the disposal of related equipment.

U.S. State and Local Government.  Our U.S. state and local government revenue increased 20.3% in the first nine months of fiscal 2021 compared to the same period last year. The increase reflects continued broad-based growth in our U.S. state and local government project-related infrastructure business, particularly with increased revenue from municipal water infrastructure work in the metropolitan areas of California, Texas, and Florida. Our disaster response activities also increased compared to the first nine months of fiscal 2020. Most of our work for U.S. state and local governments relates to critical water and environmental programs, which we expect to continue to grow for the remainder of this fiscal year. The risk of further budgetary constraints to our clients is mitigated with the passage of the American Rescue Plan Act of 2021, signed into law on March 11, 2021, which provides financial support for state and local governments.

U.S. Federal Government.  Our U.S. federal government revenue increased 9.2% in the first nine months of fiscal 2021 compared to the prior-year period. This increase includes the contributions from acquisitions, which did not have comparable revenue in the first nine months of fiscal 2020. During periods of economic volatility, our U.S. federal government business has historically been the most stable and predictable. We expect our U.S. federal government revenue to grow for the remainder of fiscal 2021 due to continued increased federal advanced analytics activity. However, U.S. federal spending amounts and priorities could change significantly from our current expectations, which could have a significant positive or negative impact on our fiscal 2021 revenue.

U.S. Commercial.  Our U.S. commercial revenue decreased 11.0% in the first nine months of fiscal 2021 compared to the same period last year. The decline was primarily due to reduced industrial activity as a result of the COVID-19 pandemic. We currently expect our U.S. commercial revenue to grow for the remainder of fiscal 2021 with higher revenue from renewable energy and environmental programs; however, if conditions due to the COVID-19 pandemic worsen or are prolonged, it could have a negative impact on our revenue for the remainder of the fiscal year.

International.  Our international revenue increased 0.4% in the first nine months of fiscal 2021 compared to the prior-year period. Excluding the contribution from a fiscal 2021 acquisition and the impact of the aforementioned prior-year disposal of our Canadian turn-key pipeline activities, our international revenue increased 1.1% in the first nine months of fiscal 2021 compared to the same period last year. The revenue growth primarily reflects increased infrastructure activity in Canada and fewer restrictions related to the COVID-19 pandemic in the third quarter of fiscal 2021. We currently expect our overall international government work to grow for the remainder of fiscal 2021.

RESULTS OF OPERATIONS

Consolidated Results of Operations

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	Three Months Ended							Nine Months Ended
	June 27, 2021		June 28, 2020		Change			June 27, 2021		June 28, 2020		Change
					$		%					$		%
	($ in thousands)
Revenue	$	801,633	$	709,771	$	91,862	12.9%	$	2,321,500	$	2,241,527	$	79,973	3.6%
Subcontractor costs	(163,590)		(149,494)		(14,096)		(9.4)	(478,461)		(482,768)		4,307		0.9
Revenue, net of subcontractor costs (1)	638,043		560,277		77,766		13.9	1,843,039		1,758,759		84,280		4.8
Other costs of revenue	(512,347)		(445,880)		(66,467)		(14.9)	(1,488,549)		(1,437,625)		(50,924)		(3.5)
Gross profit	125,696		114,397		11,299		9.9	354,490		321,134		33,356		10.4
Selling, general and administrative expenses	(55,859)		(50,822)		(5,037)		(9.9)	(157,788)		(148,299)		(9,489)		(6.4)
Contingent consideration - fair value adjustments	(30)		(50)		20		40.0	163		1,521		(1,358)		(89.3)
Income from operations	69,807		63,525		6,282		9.9	196,865		174,356		22,509		12.9
Interest expense	(2,737)		(3,564)		827		23.2	(8,585)		(10,412)		1,827		17.5
Income before income tax expense	67,070		59,961		7,109		11.9	188,280		163,944		24,336		14.8
Income tax expense	(15,146)		(14,458)		(688)		(4.8)	(38,380)		(34,710)		(3,670)		(10.6)
Net income	51,924		45,503		6,421		14.1	149,900		129,234		20,666		16.0
Net income attributable to noncontrolling interests	(21)		(6)		(15)		(250.0)	(44)		(29)		(15)		51.7
Net income attributable to Tetra Tech	$	51,903	$	45,497	$	6,406	14.1	$	149,856	$	129,205	$	20,651	16.0
Diluted earnings per share	$	0.95	$	0.83	$	0.12	14.5%	$	2.74	$	2.34	$	0.40	17.1%
(1)    We believe that the presentation of “Revenue, net of subcontractor costs”, which is a non-U.S. GAAP financial measure, enhances investors’ ability to analyze our business trends and performance because it substantially measures the work performed by our employees. While providing services, we routinely subcontract various services and, under certain U.S. Agency for International Development programs, issue grants. Generally, these subcontractor costs and grants are passed through to our clients and, in accordance with U.S. GAAP and industry practice, are included in our revenue when it is our contractual responsibility to procure or manage these activities. The grants are included as part of our subcontractor costs. Because subcontractor services can vary significantly from project to project and period to period, changes in revenue may not necessarily be indicative of our business trends. Accordingly, we segregate subcontractor costs from revenue to promote a better understanding of our business by evaluating revenue exclusive of costs associated with external service providers.

In the third quarter of fiscal 2021, revenue and revenue, net of subcontractor costs, increased $91.9 million, or 12.9%, and $77.8 million, or 13.9%, respectively, compared to the year-ago quarter. Excluding the net contributions from the aforementioned acquisitions/disposal, our revenue grew $67.2 million, or 9.5%, respectively, compared to the third quarter of fiscal 2020. Our GSG segment's revenue and revenue, net of subcontractor costs, increased $56.5 million, or 13.1%, and $36.7 million, or 11.5%, respectively, in the third quarter of fiscal 2021 compared to last year's third quarter. Our CIG segment's revenue and revenue, net of subcontractor costs, increased $36.4 million, or 12.5%, and $41.0 million, or 17.0%, respectively, in the third quarter of fiscal 2021 compared to the third quarter of fiscal 2020.

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In the first nine months of fiscal 2021, revenue and revenue, net of subcontractor costs, increased $80.0 million, or 3.6%, and increased $84.3 million, or 4.8%, respectively, compared to the prior-year period. Excluding the net contributions from the aforementioned acquisitions/disposal, our revenue for the first nine months of fiscal 2021 was comparable to the prior-year period. Our GSG segment's revenue and revenue, net of subcontractor costs, increased $104.7 million, or 7.9%, and $78.0 million, or 8.0%, respectively, in the first nine months of fiscal 2021 compared to the same period last year. Our CIG segment's revenue decreased $19.0 million, or 2.0%, and revenue, net of subcontractor costs, increased $5.7 million, or 0.7% in the first nine months of fiscal 2021 compared to the first nine months of fiscal 2020. Our quarterly and year-to-date results for our GSG and CIG segments are described below under "Government Services Group" and "Commercial/International Services Group", respectively.

The following table reconciles our reported results to non-U.S. GAAP adjusted results, which exclude gains on non-core dispositions, earn-out adjustments, COVID-19 impact and RCM results. The gains on non-core dispositions in the third quarter and first nine months of fiscal 2020 relate to the disposal of our Canadian turn-key pipeline activities that commenced in the fourth quarter of fiscal 2019. The effective tax rate applied to the adjustments to earnings per share ("EPS") to arrive at adjusted EPS averaged 24.3% in the first nine months of fiscal 2020. We applied the relevant marginal statutory tax rate based on the nature of the adjustments and tax jurisdiction in which they occur. Both EPS and adjusted EPS were calculated using diluted weighted-average common shares outstanding for the respective periods as reflected in our consolidated statements of income.

During the second quarter of fiscal 2020, we took actions in response to the COVID-19 pandemic to ensure the health and safety of our employees, clients, and communities. These actions included activating our Business Continuity Plan globally, which enabled 95% of our workforce to work remotely and all 450 of our global offices to remain operational supporting our programs and projects. This required incremental costs for employee relocation, expansion of our virtual private network capabilities, enhanced security, and sanitizing of our offices. In addition, we incurred severance costs to right-size select operations where projects were cancelled specifically due to COVID-19 concerns and the resulting macroeconomic conditions. These incremental costs totaled $8.2 million in the second quarter of fiscal 2020. Although the charges were recognized in the second quarter of fiscal 2020, substantially all of these costs were paid in cash in the third quarter of fiscal 2020.

	Three Months Ended							Nine Months Ended
	June 27, 2021		June 28, 2020		Change			June 27, 2021		June 28, 2020		Change
					$		%					$		%
	($ in thousands)
Income from operations	$	69,807	$	63,525	$	6,282	9.9%	$	196,865	$	174,356	$	22,509	12.9%
RCM	—		1		(1)		NM	(1)		—		(1)		NM
Non-core dispositions	—		(4,494)		4,494		NM	—		(7,478)		7,478		NM
Earn-out adjustments	—		550		(550)		NM	—		(421)		421		NM
COVID-19	—		—		—		NM	—		8,233		(8,233)		NM
Adjusted income from operations (1)	$	69,807	$	59,582	$	10,225	17.2%	$	196,864	$	174,690	$	22,174	12.7%
EPS	$	0.95	$	0.83	$	0.12	14.5%	$	2.74	$	2.34	$	0.40	17.1%
Non-core dispositions	—		(0.06)		0.06		NM	—		(0.10)		0.10		NM
Earn-out adjustments	—		0.01		(0.01)		NM	—		(0.01)		0.01		NM
COVID-19	—				—		NM	—		0.11		(0.11)		NM
Adjusted EPS (1)	$	0.95	$	0.78	$	0.17	21.8%	$	2.74	$	2.34	$	0.40	17.1%

NM = not meaningful

(1) Non-GAAP financial measure

29

Our operating income increased $6.3 million and $22.5 million in the third quarter and first nine months of fiscal 2021, respectively, compared to fiscal 2020 periods. Our GSG segment's operating income increased $6.2 million and $22.6 million in the third quarter and first nine months of fiscal 2021, respectively, compared to the prior-year periods. These results are described below under "Government Services Group." Our CIG segment's operating income increased $5.2 million and $7.7 million in the third quarter and first nine months of fiscal 2021, respectively, compared to the year-ago periods. These results are described below under "Commercial/International Services Group."

Our net interest expense decreased $0.8 million and $1.8 million in the third quarter and first nine months of fiscal 2021, respectively, compared to the prior-year periods. The decreases primarily reflect reduced borrowings.

Our income tax expense increased $0.7 million and $3.7 million in the third quarter and first nine months of fiscal 2021, respectively, compared to the same periods last year due to increased pre-tax income. Our effective tax rates for the first nine months of fiscal 2021 and 2020 were 20.4% and 21.2%, respectively. Income tax expense was reduced by $8.7 million and $7.0 million of excess tax benefits on share-based payments in the nine months of fiscal 2021 and 2020, respectively. Excluding the impact of the excess tax benefits on share-based payments, our effective tax rates in the first nine months of fiscal 2021 and 2020 were 25.0% and 25.4%, respectively.

Our EPS was $0.95 and $2.74 in the third quarter and first nine months of fiscal 2021, compared to $0.83 and $2.34 in the prior-year periods, respectively. On the same basis as our adjusted operating income, EPS was $0.95 and $2.74 in the third quarter and first nine months of fiscal 2021, compared to $0.78 and $2.34 in fiscal 2020 periods, respectively.

Segment Results of Operations

Government Services Group

	Three Months Ended							Nine Months Ended
	June 27, 2021		June 28, 2020		Change			June 27, 2021		June 28, 2020		Change
					$		%					$		%
	($ in thousands)
Revenue	$	488,700	$	432,180	$	56,520	13.1%	$	1,431,151	$	1,326,487	$	104,664	7.9%
Subcontractor costs	(132,751)		(112,946)		(19,805)		(17.5)	(383,198)		(356,505)		(26,693)		(7.5)
Revenue, net of subcontractor costs	$	355,949	$	319,234	$	36,715	11.5	$	1,047,953	$	969,982	$	77,971	8.0
Income from operations	$	49,297	$	43,100	$	6,197	14.4%	$	143,106	$	120,495	$	22,611	18.8%

Revenue and revenue, net of subcontractor costs, increased $56.5 million, or 13.1%, and $36.7 million, or 11.5%, respectively, in the third quarter of fiscal 2021 compared to the year-ago quarter. For the first nine months of fiscal 2021, revenue and revenue, net of subcontractor costs, increased $104.7 million, or 7.9%, and $78.0 million, or 8.0%, respectively, compared to the prior-year period. These increases reflect higher U.S. state and local government activities related to water and environmental programs, and disaster response. Additionally, the increases also reflect contributions from the aforementioned acquisitions.

Operating income increased $6.2 million and $22.6 million in the third quarter and first nine months of fiscal 2021, respectively, compared to the prior-year periods, reflecting the higher revenue. In addition, we incurred $1.6 million of incremental costs for actions to respond to the COVID-19 pandemic in the second quarter of fiscal 2020. Our operating margin, based on revenue, net of subcontractor costs, improved to 13.7% in the first nine months of fiscal 2021 compared to 12.4% in the same period last year. Excluding the COVID-19 charges, our operating margin was 12.6% in the first nine months of fiscal 2020. The improved operating margin was primarily due to our increased focus on high-end consulting services and improved labor utilization.

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Commercial/International Services Group

	Three Months Ended							Nine Months Ended
	June 27, 2021		June 28, 2020		Change			June 27, 2021		June 28, 2020		Change
					$		%					$		%
	($ in thousands)
Revenue	$	327,434	$	291,021	$	36,413	12.5%	$	931,586	$	950,597	$	(19,011)	(2.0)	%
Subcontractor costs	(45,393)		(49,983)		4,590		9.2	(137,088)		(161,797)		24,709		15.3
Revenue, net of subcontractor costs	$	282,041	$	241,038	$	41,003	17.0	$	794,498	$	788,800	$	5,698	0.7
Income from operations	$	34,017	$	28,848	$	5,169	17.9%	$	89,886	$	82,156	$	7,730	9.4	%

Revenue and revenue, net of subcontractor costs, increased $36.4 million, or 12.5%, and $41.0 million, or 17.0%, respectively, in the third quarter of fiscal 2021 compared to the prior-year quarter. For the first nine months of fiscal 2021, revenue and revenue, net of subcontractor costs, decreased $19.0 million, or 2.0%, and increased $5.7 million, or 0.7%, respectively, compared to the year-ago period. Excluding the impact of the disposal of our Canadian turn-key pipeline activities, revenue increased 11.8% and decreased 1.5% in the third quarter and first nine months of fiscal 2021, respectively, compared to fiscal 2020 periods. Revenue growth in the third quarter of fiscal 2021 reflects increased infrastructure activity in Canada and fewer restrictions related to the COVID-19 pandemic in the third quarter of fiscal 2021. The decline in the first nine months of fiscal 2021 was primarily due to the adverse impact of the COVID-19 pandemic during the first half of fiscal 2021 compared to the first half of fiscal 2020.

Operating income increased $5.2 million and $7.7 million in the third quarter and first nine months of fiscal 2021, respectively, compared to fiscal 2020 periods. In the second quarter of fiscal 2020, we incurred $6.6 million of incremental costs for actions to respond to the COVID-19 pandemic. Additionally, operating income in the third quarter and first nine months of fiscal 2021 included gains of $2.0 million compared to gains in the same periods of fiscal 2020 of $4.5 million and $7.5 million, respectively, related to the disposition of our Canadian pipeline activities. Excluding these COVID-19 charges and disposition gains, operating income increased $7.7 million and $6.6 million in the third quarter and first nine months of fiscal 2021, respectively, compared to fiscal 2020 periods. Our operating margin, based on revenue, net of subcontractor costs, improved to 11.3% in the first nine months of fiscal 2021 compared to 10.4% in the same period last year. Excluding the COVID-19 charges and disposition gains, our operating margin was 11.1% in the first nine months of fiscal 2021 compared to 10.3% in the same period last year. The improved operating margin was primarily due to our increased focus on high-end consulting services and improved labor utilization.

Remediation and Construction Management

	Three Months Ended						Nine Months Ended
	June 27, 2021		June 28, 2020		Change		June 27, 2021		June 28, 2020		Change
					$						$
	($ in thousands)
Revenue	$	143	$	48	$	95	$	613	$	198	$	415
Subcontractor costs	(90)		(43)		(47)		(25)		(221)		196
Revenue, net of subcontractor costs	$	53	$	5	$	48	$	588	$	(23)	$	611
Income (loss) from operations	$	—	$	(1)	$	1	$	1	$	—	$	1

RCM's projects were substantially complete at the end of fiscal 2018. There were no significant operating activities in RCM for the third quarter and first nine months of fiscal 2021 and 2020.

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Backlog

The following table provides a reconciliation between remaining unsatisfied performance obligations ("RUPOs") and backlog:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
RUPOs	$	3,231,133	$	3,218,973
Items impacting comparability:
Contract term	18,775		20,312
Backlog	$	3,249,908	$3,239,285

Backlog generally represents the dollar amount of revenues we expect to realize in the future when we perform the work. The difference between RUPOs and backlog relates to contract terms. Specifically, our backlog does not consider the impact of termination for convenience clauses within the contracts. The contract term and thus remaining performance obligation on certain of our operations and maintenance contracts, are limited to the notice period required for contract termination (usually 30, 60, or 90 days).

Financial Condition, Liquidity and Capital Resources

Capital Requirements.  As of June 27, 2021, we had $234.3 million of cash and cash equivalents and access to an additional $721 million of borrowings available under our credit facility. During the first nine months of fiscal 2021, we generated $226.5 million of cash from operations. To date, we have not experienced any significant deterioration in our financial condition or liquidity due to the COVID-19 pandemic and our credit facilities remain available.

Our primary sources of liquidity are cash flows from operations and borrowings under our credit facilities. Our primary uses of cash are to fund working capital, capital expenditures, stock repurchases, cash dividends and repayment of debt, as well as to fund acquisitions and earn-out obligations from prior acquisitions. We believe that our existing cash and cash equivalents, operating cash flows and borrowing capacity under our credit agreement, as described below, will be sufficient to meet our capital requirements for at least the next 12 months including any additional resources needed to address the COVID-19 pandemic.

We use a variety of tax planning and financing strategies to manage our worldwide cash and deploy funds to locations where they are needed. We have no need or plans to repatriate foreign earnings at this time.

On January 27, 2020, the Board of Directors authorized a new $200 million stock repurchase program, which was included in our remaining balance of $207.8 million as of fiscal 2020 year-end. In the first nine months of fiscal 2021, we repurchased and settled 368,177 shares with an average price of $122.22 per share for a total cost of $45.0 million in the open market. At June 27, 2021, we had a remaining balance of $162.8 million under our stock repurchase program.

On November 9, 2020, the Board of Directors declared a quarterly cash dividend of $0.17 per share payable on December 11, 2020 to stockholders of record as of the close of business on November 30, 2020. On January 25, 2021, the Board of Directors declared a quarterly cash dividend of $0.17 per share payable on February 26, 2021 to stockholders of record as of the close of business on February 10, 2021. On April 26, 2021, the Board of Directors declared a quarterly cash dividend of $0.20 per share payable on May 28, 2021 to stockholders of record as of the close of business on May 12, 2021.

Subsequent Event.  On July 26, 2021, the Board of Directors declared a quarterly cash dividend of $0.20 per share payable on September 3, 2021 to stockholders of record as of the close of business on August 20, 2021.

Cash Equivalents and Restricted Cash.  As of June 27, 2021, cash equivalents and restricted cash were $234.3 million, an increase of $76.8 million compared to the fiscal 2020 year-end. The increase was due to net cash provided by operating activities, partially offset by net repayments of long-term debt, stock repurchases, as well as payments for business acquisitions and contingent earn-out payments.

Operating Activities.  For the first nine months of fiscal 2021, net cash provided by operating activities was $226.5 million, an increase of $32.0 million compared to the prior-year period. The increase primarily reflects an increase in earnings

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adjusted for non-cash items of $23.8 million and improved working capital in the first nine months of fiscal 2021 compared to the same period last year.

Investing Activities.  For the first nine months of fiscal 2021, net cash used in investing activities was $23.1 million, an increase of $2.4 million compared to the year-ago period. The increase was due to the proceeds from sales of equipment related to the disposal of our Canadian turn-key pipeline activities in the fiscal 2020 period, partially offset by lower payments for business acquisitions in the current year period compared to the prior-year period.

Financing Activities.  For the first nine months of fiscal 2021, net cash used in financing activities was $137.5 million, a decrease of $15.1 million compared to the fiscal 2020 period. The decrease was due to decreased stock repurchases and payments of contingent earn-outs compared to the prior-year period. This change was partially offset by a net increase of repayments of debt compared to the year-ago period.

Debt Financing. On July 30, 2018, we entered into a Second Amended and Restated Credit Agreement (“Amended Credit Agreement”) with a total borrowing capacity of $1 billion that will mature in July 2023. The Amended Credit Agreement is a $700 million senior secured, five-year facility that provides for a $250 million term loan facility (the “Amended Term Loan Facility”), a $450 million revolving credit facility (the “Amended Revolving Credit Facility”), and a $300 million accordion feature that allows us to increase the Amended Credit Agreement to $1 billion subject to lender approval. The Amended Credit Agreement allows us to, among other things, (i) refinance indebtedness under our Credit Agreement dated as of May 7, 2013; (ii) finance certain permitted open market repurchases of our common stock, permitted acquisitions, and cash dividends and distributions; and (iii) utilize the proceeds for working capital, capital expenditures and other general corporate purposes. The Amended Revolving Credit Facility includes a $100 million sublimit for the issuance of standby letters of credit, a $20 million sublimit for swingline loans, and a $200 million sublimit for multicurrency borrowings and letters of credit.

The entire Amended Term Loan Facility was drawn on July 30, 2018. The Amended Term Loan Facility is subject to quarterly amortization of principal at 5% annually beginning December 31, 2018. We may borrow on the Amended Revolving Credit Facility, at our option, at either (a) a Eurocurrency rate plus a margin that ranges from 1.00% to 1.75% per annum, or (b) a base rate for loans in U.S. dollars (the highest of the U.S. federal funds rate plus 0.50% per annum, the bank’s prime rate or the Eurocurrency rate plus 1.00%) plus a margin that ranges from 0% to 0.75% per annum. In each case, the applicable margin is based on our Consolidated Leverage Ratio, calculated quarterly. The Amended Term Loan Facility is subject to the same interest rate provisions. The Amended Credit Agreement expires on July 30, 2023, or earlier at our discretion upon payment in full of loans and other obligations.

As of June 27, 2021, we had $246.5 million. in outstanding borrowings under the Amended Credit Agreement, which was comprised of $218.8 million under the Term Loan Facility and $27.7 million outstanding under the Amended Revolving Credit Facility at a year-to-date weighted-average interest rate of 1.28% per annum. In addition, we had $0.7 million in standby letters of credit under the Amended Credit Agreement. Our average effective weighted-average interest rate on borrowings outstanding during the nine months ended June 27, 2021 under the Amended Credit Agreement, including the effects of interest rate swap agreements described in Note 14, “Derivative Financial Instruments” of the “Notes to Consolidated Financial Statements”, was 3.28%. At June 27, 2021, we had $421.0 million of available credit under the Amended Revolving Credit Facility, all of which could be borrowed without a violation of our debt covenants.

The Amended Credit Agreement contains certain affirmative and restrictive covenants, and customary events of default. The financial covenants provide for a maximum Consolidated Leverage Ratio of 3.00 to 1.00 (total funded debt/EBITDA, as defined in the Amended Credit Agreement) and a minimum Consolidated Interest Coverage Ratio of 3.00 to 1.00 (EBITDA/Consolidated Interest Charges, as defined in the Amended Credit Agreement). Our obligations under the Amended Credit Agreement are guaranteed by certain of our domestic subsidiaries and are secured by first priority liens on (i) the equity interests of certain of our subsidiaries, including those subsidiaries that are guarantors or borrowers under the Amended Credit Agreement, and (ii) the accounts receivable, general intangibles and intercompany loans, and those of our subsidiaries that are guarantors or borrowers. At June 27, 2021, we were in compliance with these covenants with a consolidated leverage ratio of 0.98x and a consolidated interest coverage ratio of 25.08x.

In addition to the Amended Credit Agreement, we maintain other credit facilities, which may be used for bank overdrafts, short-term cash advances and bank guarantees. At June 27, 2021, there was $2.5 million outstanding under these facilities and the aggregate amount of standby letters of credit outstanding was $55.3 million. As of June 27, 2021, we had bank overdrafts of $3.6 million related to our U.S. and U.K. disbursement bank accounts. This balance is reported in the "Current portion of long-term debt and other short-term borrowings" on our consolidated balance sheet as of June 27, 2021. The change in bank overdraft balance is classified as cash flows from financing activities on our consolidated statements of cash flows as we believe these overdrafts to be a form of short-term financing from the bank due to our ability to fund the overdraft with the overdraft protection on the bank accounts or our other credit facilities if needed.

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Inflation.  We believe our operations have not been, and, in the foreseeable future, are not expected to be, materially adversely affected by inflation or changing prices due to the average duration of our projects and our ability to negotiate prices as contracts end and new contracts begin.

Dividends.  Our Board of Directors has authorized the following dividends in fiscal 2021:

	Dividend  Per Share		Record Date	Total Maximum Payment (in thousands)		Payment Date
November 9, 2020	$	0.17	November 30, 2020	$	9,198	December 11, 2020
January 25, 2021	$	0.17	February 10, 2021	$	9,212	February 26, 2021
April 26, 2021	$	0.20	May 12, 2021	$	10,831	May 28, 2021
July 26, 2021	$	0.20	August 20, 2021	N/A		September 3, 2021

Income Taxes

We evaluate the realizability of our deferred tax assets by assessing the valuation allowance and adjust the allowance, if necessary. The factors used to assess the likelihood of realization are our forecast of future taxable income and available tax planning strategies that could be implemented to realize the net deferred tax assets. The ability or failure to achieve the forecasted taxable income in the applicable taxing jurisdictions could affect the ultimate realization of deferred tax assets. Based on future operating results in certain jurisdictions, it is likely that the current valuation allowance positions of those jurisdictions could be adjusted in the next 12 months (including as soon as the fourth quarter of fiscal 2021), particularly in the United Kingdom where we have a valuation allowance of approximately $12.5 million primarily related to the realizability of net operating loss carry-forwards.

As of June 27, 2021 and September 27, 2020, the liability for income taxes associated with uncertain tax positions was $12.8 million and $9.7 million, respectively. 

It is reasonably possible that the amount of the unrecognized benefit with respect to certain of our unrecognized tax positions may significantly decrease within the next 12 months. These liabilities represent our current estimates of the additional tax liabilities that we may be assessed when the related audits are concluded. If these audits are resolved in a manner more unfavorable than our current expectations, our additional tax liabilities could be materially higher than the amounts currently recorded resulting in additional tax expense.

Off-Balance Sheet Arrangements

In the ordinary course of business, we may use off-balance sheet arrangements if we believe that such arrangements would be an efficient way to lower our cost of capital or help us manage the overall risks of our business operations. We do not believe that such arrangements have had a material adverse effect on our financial position or our results of operations.

The following is a summary of our off-balance sheet arrangements:

•Letters of credit and bank guarantees are used primarily to support project performance and insurance programs. We are required to reimburse the issuers of letters of credit and bank guarantees for any payments they make under the outstanding letters of credit or bank guarantees. Our Amended Credit Agreement and additional letter of credit facilities cover the issuance of our standby letters of credit and bank guarantees and are critical for our normal operations. If we default on the Amended Credit Agreement or additional credit facilities, our inability to issue or renew standby letters of credit and bank guarantees would impair our ability to maintain normal operations. At June 27, 2021, we had $0.7 million in standby letters of credit outstanding under our Amended Credit Agreement and $55.3 million in standby letters of credit outstanding under our additional letter of credit facilities.

•From time to time, we provide guarantees and indemnifications related to our services. If our services under a guaranteed or indemnified project are later determined to have resulted in a material defect or other material deficiency, then we may be responsible for monetary damages or other legal remedies. When sufficient information about claims on guaranteed or indemnified projects is available and monetary damages or other costs or losses are determined to be probable, we recognize such guaranteed losses.

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•In the ordinary course of business, we enter into various agreements as part of certain unconsolidated subsidiaries, joint ventures, and other jointly executed contracts where we are jointly and severally liable. We enter into these agreements primarily to support the project execution commitments of these entities. The potential payment amount of an outstanding performance guarantee is typically the remaining cost of work to be performed by or on behalf of third parties under engineering and construction contracts. However, we are not able to estimate other amounts that may be required to be paid in excess of estimated costs to complete contracts and, accordingly, the total potential payment amount under our outstanding performance guarantees cannot be estimated. For cost-plus contracts, amounts that may become payable pursuant to guarantee provisions are normally recoverable from the client for work performed under the contract. For lump sum or fixed-price contracts, this amount is the cost to complete the contracted work less amounts remaining to be billed to the client under the contract. Remaining billable amounts could be greater or less than the cost to complete. In those cases where costs exceed the remaining amounts payable under the contract, we may have recourse to third parties, such as owners, co-venturers, subcontractors or vendors, for claims.

•In the ordinary course of business, our clients may request that we obtain surety bonds in connection with contract performance obligations that are not required to be recorded in our consolidated balance sheets. We are obligated to reimburse the issuer of our surety bonds for any payments made thereunder. Each of our commitments under performance bonds generally ends concurrently with the expiration of our related contractual obligation.

Critical Accounting Policies

Our critical accounting policies are disclosed in our Annual Report on Form 10-K for the fiscal year ended September 27, 2020. To date, there have been no material changes in our critical accounting policies as reported in our 2020 Annual Report on Form 10-K.

New Accounting Pronouncements

For information regarding recent accounting pronouncements, see “Notes to Consolidated Financial Statements” included in Part I, Item 1 of this Quarterly Report.

Financial Market Risks

We do not enter into derivative financial instruments for trading or speculation purposes. In the normal course of business, we have exposure to both interest rate risk and foreign currency transaction and translation risk, primarily related to the Canadian and Australian dollar, and British Pound.

We are exposed to interest rate risk under our Amended Credit Agreement. We can borrow, at our option, under both the Amended Term Loan Facility and Amended Revolving Credit Facility. We may borrow on the Amended Revolving Credit Facility, at our option, at either (a) a Eurocurrency rate plus a margin that ranges from 1.00% to 1.75% per annum, or (b) a base rate for loans in U.S. dollars (the highest of the U.S. federal funds rate plus 0.50% per annum, the bank’s prime rate or the Eurocurrency rate plus 1.00%) plus a margin that ranges from 0% to 0.75% per annum. Borrowings at the base rate have no designated term and may be repaid without penalty any time prior to the Facility’s maturity date. Borrowings at a Eurodollar rate have a term no less than 30 days and no greater than 180 days and may be prepaid without penalty. Typically, at the end of such term, such borrowings may be rolled over at our discretion into either a borrowing at the base rate or a borrowing at a Eurodollar rate with similar terms, not to exceed the maturity date of the Facility. The Facility matures on July 30, 2023. At June 27, 2021, we had borrowings outstanding under the Credit Agreement of $246.5 million at a year-to-date weighted-average interest rate of 1.28% per annum.

In August 2018, we entered into five interest rate swap agreements with five banks to fix the variable interest rate on $250 million of our Amended Term Loan Facility. The objective of these interest rate swaps was to eliminate the variability of our cash flows on the amount of interest expense we pay under our Credit Agreement. As of June 27, 2021, the notional principal of our outstanding interest swap agreements was $218.8 million ($43.8 million each.) Our year-to-date average effective interest rate on borrowings outstanding under the Credit Agreement, including the effects of interest rate swap agreements, at June 27, 2021, was 3.28%. For more information, see Note 14, “Derivative Financial Instruments” of the “Notes to Consolidated Financial Statements”.

Most of our transactions are in U.S. dollars; however, some of our subsidiaries conduct business in foreign currencies, primarily the Canadian and Australian dollar, and British Pound. Therefore, we are subject to currency exposure and volatility because of currency fluctuations. We attempt to minimize our exposure to these fluctuations by matching revenue and expenses

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in the same currency for our contracts. For the first nine months of fiscal 2021 and 2020, we reported $1.8 million of foreign currency loss and $0.2 million of foreign currency gain, respectively, in “Selling, general and administrative expenses” on our consolidated statements of income.

We have foreign currency exchange rate exposure in our results of operations and equity primarily because of the currency translation related to our foreign subsidiaries where the local currency is the functional currency. To the extent the U.S. dollar strengthens against foreign currencies, the translation of these foreign currency denominated transactions will result in reduced revenue, operating expenses, assets and liabilities. Similarly, our revenue, operating expenses, assets and liabilities will increase if the U.S. dollar weakens against foreign currencies. For the first nine months of fiscal 2021 and 2020, 29.2% and 30.1% of our consolidated revenue, respectively, was generated by our international business. For the first nine months of fiscal 2021, the effect of foreign exchange rate translation on the consolidated balance sheets was an increase in our equity by $54.5 million compared to a decrease in equity of $11.4 million in the first nine months of fiscal 2020. These amounts were recognized as adjustments to equity through other comprehensive income.

Item 3.           Quantitative and Qualitative Disclosures about Market Risk

Please refer to the information we have included under the heading “Financial Market Risks” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 2 of this Form 10-Q which is incorporated herein by reference.

Item 4.           Controls and Procedures

Evaluation of disclosure controls and procedures and changes in internal control over financial reporting.  As of June 27, 2021, we carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures. Based on our management’s evaluation (with the participation of our principal executive officer and principal financial officer), our principal executive officer and principal financial officer have concluded that, as of the end of the period covered by this report, our disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) under the Exchange Act), were effective.

Changes in internal control over financial reporting.  There were no changes in our internal control over financial reporting that occurred during the quarter ended June 27, 2021 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II.               OTHER INFORMATION

Item 1.           Legal Proceedings

For information regarding legal proceedings, see Note 16, "Commitments and Contingencies" included in the "Notes to Consolidated Financial Statements" included in Part I, Item 1 of this Form 10-Q which is incorporated herein by reference.

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Item 1A.                Risk Factors

There have been no material changes in our risk factors disclosed in Part I, Item 1A in our 2020 Annual Report on Form 10-K. For updated disclosures related to interest and exchange rate risks, see “Financial Market Risks” in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 2 of this Form 10-Q which is incorporated herein by reference.

Item 2.                                                         Unregistered Sales of Equity Securities and Use of Proceeds

On January 27, 2020, the Board of Directors authorized a new $200 million stock repurchase program, which was included in our remaining balance of $207.8 million as of fiscal 2020 year-end. In the first nine months of fiscal 2021, we repurchased and settled 368,177 shares with an average price of $122.22 per share for a total cost of $45.0 million in the open market. At June 27, 2021, we had a remaining balance of $162.8 million under our stock repurchase program.

Below is a summary of the stock repurchases that were traded and settled during the first nine months of fiscal 2021:

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Dollar Value that May Yet be Purchased Under the Plans or Programs (in thousands)
September 28, 2020 - October 25, 2020	45,574	$	102.67	45,574	$	203,134
October 26, 2020 - November 22, 2020	46,975	110.67		46,975	197,935
November 23, 2020 - December 27, 2020	42,864	119.50		42,864	192,813
December 28, 2020 - January 24, 2021	33,790	125.46		33,790	188,574
January 25, 2021 - February 21, 2021	37,992	132.50		37,992	183,540
February 22, 2021 - March 28, 2021	42,519	134.69		42,519	177,813
March 29, 2021 - April 25, 2021	32,405	136.36		32,405	173,394
April 26, 2021 - May 23, 2021	41,534	125.17		41,534	168,195
May 24, 2021 - June 27, 2021	44,524	120.88		44,524	162,813

Item 4.                                                         Mine Safety Disclosures

Section 1503 of the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act") requires domestic mine operators to disclose violations and orders issued under the Mine Act by Mine Safety and Health Administration. We do not act as the owner of any mines, but we may act as a mining operator as defined under the Mine Act where we may be an independent contractor performing services or construction at such mine. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Act and Item 104 of Regulation S-K is included in Exhibit 95.

Item 6.                                                         Exhibits

The following documents are filed as Exhibits to this Report:

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31.1	Chief Executive Officer Certification pursuant to Rule 13a-14(a)/15d-14(a).
31.2	Chief Financial Officer Certification pursuant to Rule 13a-14(a)/15d-14(a).
32.1	Certification of Chief Executive Officer pursuant to Section 1350.
32.2	Certification of Chief Financial Officer pursuant to Section 1350.
95	Mine Safety Disclosure.
101	The following financial information from our Company’s Quarterly Report on Form 10-Q, for the period ended June 27, 2021, formatted in Inline eXtensible Business Reporting Language: (i) Consolidated Balance Sheets (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Comprehensive Income, (iv) Consolidated Statements of Cash Flows, (v) Consolidated Statements of Equity, (vi) Notes to Consolidated Financial Statements.

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SIGNATURES

    Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

 

Dated: July 30, 2021	TETRA TECH, INC.
	By:	/s/ DAN L. BATRACK
		Dan L. Batrack
		Chairman and Chief Executive Officer
		(Principal Executive Officer)
	By:	/s/ STEVEN M. BURDICK
		Steven M. Burdick
		Executive Vice President, Chief Financial Officer
		(Principal Financial Officer)
	By:	/s/ BRIAN N. CARTER
		Brian N. Carter
		Senior Vice President, Corporate Controller
		(Principal Accounting Officer)

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EX-31.1

Exhibit 31.1

Chief Executive Officer Certification Pursuant to

Rule 13a-14(a)/15d-14(a)

I, Dan L. Batrack, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Tetra Tech, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: July 30, 2021   

/s/ Dan L. Batrack

Dan L. Batrack

Chairman, Chief Executive Officer and President

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

Chief Financial Officer Certification Pursuant to

Rule 13a-14(a)/15d-14(a)

I, Steven M. Burdick, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Tetra Tech, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

(a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: July 30, 2021 

/s/ Steven M. Burdick

Steven M. Burdick

Chief Financial Officer

(Principal Financial Officer)

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer Pursuant to

Section 1350

In connection with the Quarterly Report of Tetra Tech, Inc. (the “Company”) on Form 10-Q for the quarterly period ended June 27, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dan L. Batrack, Chief Executive Officer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.The Report fully complies with requirements of Section 13(a) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Dan L. Batrack

Dan L. Batrack

Chairman, Chief Executive Officer and President

July 30, 2021

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Tetra Tech, Inc. and will be retained by Tetra Tech, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished to the Securities and Exchange Commission as an exhibit to the Form 10-Q and shall not be considered filed as part of the Form 10-Q.

EX-32.2

Exhibit 32.2

Certification of Chief Financial Officer Pursuant to

Section 1350

In connection with the Quarterly Report of Tetra Tech, Inc. (the “Company”) on Form 10-Q for the quarterly period ended June 27, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Steven M. Burdick, Chief Financial Officer and Treasurer of the Company, hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1.The Report fully complies with requirements of Section 13(a) of the Securities Exchange Act of 1934; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Steven M. Burdick

Steven M. Burdick

Chief Financial Officer

July 30, 2021

A signed original of this written statement required by Section 906, or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Tetra Tech, Inc. and will be retained by Tetra Tech, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished to the Securities and Exchange Commission as an exhibit to the Form 10-Q and shall not be considered filed as part of the Form 10-Q.

EX-95

Exhibit 95

MINE SAFETY DISCLOSURES

The following table shows, for each project performed at U.S. mines that is subject to the Federal Mine Safety and Health Act of 1977 (“MSHA”), the information required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K. Section references are to sections of MSHA.

3 Month Period Ending June 27, 2021	Tetra Tech, Inc.
Alleged violations of mandatory health or safety standards that could significantly and substantially contribute to the cause and effect of a mine safety or health hazard (#)	0
Section 104(b) orders (#)	0
Section 104(d) citations and orders (#)	0
Section 110(b)(2) violations (#)	0
Section 107(a) orders (#)	0
Proposed assessments under MSHA ($) whole dollars	0
Mining-related fatalities (#)	0
Section 104(e) notice	0
Notice of the potential for a pattern of violations under Section 104(e)	0
Legal actions before the Federal Mine Safety and Health Review Commission (“FMSHRC”) initiated (#)	0
Legal actions before the FMSHRC resolved	0
Legal actions pending before the FMSHRC, end of period	-
Contests of citations and orders reference in Subpart B of 29 CFR Part 2700	0
Contests of proposed penalties referenced in Subpart C of 29 CFR Part 2700 (#)	0
Complaints for compensation referenced in Subpart D of 29 CFR Part 2700 (#)	0
Complaints of discharge, discrimination or interference reference in Subpart E of 29 CFR Part 2700 (#)	0
Applications for temporary relief referenced in Subpart F of 29 CFR Part 2700 (#)	0
Appeals of judges’ decisions or orders reference in Subpart H of 29 CFR Part 2700 (#)	0
Total pending legal actions (#)	0

XML

Cover - shares	9 Months Ended
	Jun. 27, 2021	Jul. 19, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 27, 2021
Document Transition Report	false
Entity File Number	0-19655
Entity Registrant Name	TETRA TECH, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-4148514
Entity Address, Address Line One	3475 East Foothill Boulevard
Entity Address, City or Town	Pasadena
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91107
City Area Code	626
Local Phone Number	351-4664
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	TTEK
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		54,071,184
Entity Central Index Key	0000831641
Amendment Flag	false
Current Fiscal Year End Date	--10-03
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 27, 2021	Sep. 27, 2020
Current assets:
Cash and cash equivalents	$ 234,266	$ 157,515
Accounts receivable, net	664,393	649,035
Contract assets	91,405	92,632
Prepaid expenses and other current assets	95,576	81,094
Income taxes receivable	20,781	19,509
Total current assets	1,106,421	999,785
Property and equipment, net	36,001	35,507
Right-of-use assets, operating leases	213,236	239,396
Investments in unconsolidated joint ventures	8,180	7,332
Goodwill	1,051,796	993,498
Intangible assets, net	9,160	13,943
Deferred tax assets	34,627	32,052
Other long-term assets	51,500	57,045
Total assets	2,510,921	2,378,558
Current liabilities:
Accounts payable	132,602	111,804
Accrued compensation	193,185	199,801
Contract liabilities	179,127	171,905
Short-term lease liabilities, operating leases	64,911	69,650
Current portion of long-term debt and other short-term borrowings	16,252	49,264
Current contingent earn-out liabilities	16,320	16,142
Other current liabilities	208,951	174,890
Total current liabilities	811,348	793,456
Deferred tax liabilities	17,715	16,316
Long-term debt	234,020	242,395
Long-term lease liabilities, operating leases	173,080	191,955
Long-term contingent earn-out liabilities	14,904	16,475
Other long-term liabilities	67,359	80,588
Commitments and contingencies (Note 16)
Equity:
Preferred stock - authorized, 2,000 shares of $0.01 par value; no shares issued and outstanding at June 27, 2021 and September 27, 2020	0	0
Common stock - authorized, 150,000 shares of $0.01 par value; issued and outstanding, 54,071 and 53,797 shares at June 27, 2021 and September 27, 2020, respectively	541	538
Accumulated other comprehensive loss	(102,401)	(161,786)
Retained earnings	1,294,260	1,198,567
Tetra Tech stockholders’ equity	1,192,400	1,037,319
Noncontrolling interests	95	54
Total stockholders' equity	1,192,495	1,037,373
Total liabilities and stockholders' equity	$ 2,510,921	$ 2,378,558

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 27, 2021	Sep. 27, 2020
Statement of Financial Position [Abstract]
Preferred stock, authorized shares (in shares)	2,000,000	2,000,000
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, authorized shares (in shares)	150,000,000	150,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	54,071,000	53,797,000
Common stock, shares outstanding (in shares)	54,071,000	53,797,000

XML

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Revenue	$ 801,633	$ 709,771	$ 2,321,500	$ 2,241,527
Gross profit	125,696	114,397	354,490	321,134
Selling, general and administrative expenses	(55,859)	(50,822)	(157,788)	(148,299)
Contingent consideration – fair value adjustments	(30)	(50)	163	1,521
Income from operations	69,807	63,525	196,865	174,356
Interest expense	(2,737)	(3,564)	(8,585)	(10,412)
Income before income tax expense	67,070	59,961	188,280	163,944
Income tax expense	(15,146)	(14,458)	(38,380)	(34,710)
Net income	51,924	45,503	149,900	129,234
Net income attributable to noncontrolling interests	(21)	(6)	(44)	(29)
Net income attributable to Tetra Tech	$ 51,903	$ 45,497	$ 149,856	$ 129,205
Earnings per share attributable to Tetra Tech:
Basic (in dollars per share)	$ 0.96	$ 0.84	$ 2.77	$ 2.38
Diluted (in dollars per share)	$ 0.95	$ 0.83	$ 2.74	$ 2.34
Weighted-average common shares outstanding:
Basic (in shares)	54,117	53,985	54,095	54,366
Diluted (in shares)	54,666	54,692	54,698	55,161
Subcontractor costs
Cost of revenue	$ (163,590)	$ (149,494)	$ (478,461)	$ (482,768)
Other costs of revenue
Cost of revenue	$ (512,347)	$ (445,880)	$ (1,488,549)	$ (1,437,625)

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 51,924	$ 45,503	$ 149,900	$ 129,234
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	11,159	21,685	54,527	(11,428)
Gain (loss) on cash flow hedge valuations, net of tax	1,498	(30)	4,864	(5,726)
Other comprehensive income (loss), net of tax	12,657	21,655	59,391	(17,154)
Comprehensive income, net of tax	64,581	67,158	209,291	112,080
Comprehensive income attributable to noncontrolling interests, net of tax	23	2	50	23
Comprehensive income attributable to Tetra Tech, net of tax	$ 64,558	$ 67,156	$ 209,241	$ 112,057

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020
Cash flows from operating activities:
Net income	$ 149,900	$ 129,234
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	16,811	19,066
Equity in income of unconsolidated joint ventures	(3,513)	(5,200)
Distributions of earnings from unconsolidated joint ventures	2,773	5,280
Amortization of stock-based awards	16,261	13,494
Deferred income taxes	123	2,767
Provision for losses on accounts receivables	(4,355)	539
Fair value adjustments to contingent consideration	(163)	(1,521)
Gain on sale of property and equipment	(110)	(9,693)
Changes in operating assets and liabilities, net of effects of business acquisitions:
Accounts receivable and contract assets	15,354	148,818
Prepaid expenses and other assets	17,243	1,566
Accounts payable	19,712	(98,029)
Accrued compensation	(7,332)	(39,978)
Contract liabilities	3,083	17,328
Other liabilities	1,389	10,305
Income taxes receivable/payable	(638)	574
Net cash provided by operating activities	226,538	194,550
Cash flows from investing activities:
Payments for business acquisitions, net of cash acquired	(17,154)	(28,505)
Capital expenditures	(6,234)	(9,360)
Proceeds from sale of property and equipment	333	17,162
Net cash used in investing activities	(23,055)	(20,703)
Cash flows from financing activities:
Proceeds from borrowings	165,570	298,364
Repayments on long-term debt	(173,895)	(297,856)
Bank overdrafts	(33,770)	0
Repurchases of common stock	(45,000)	(102,188)
Taxes paid on vested restricted stock	(17,589)	(11,143)
Stock options exercised	10,703	8,263
Dividends paid	(29,241)	(25,590)
Payments of contingent earn-out liabilities	(12,374)	(22,434)
Principal payments on finance leases	(1,908)	0
Net cash used in financing activities	(137,504)	(152,584)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	10,772	(334)
Net increase in cash, cash equivalents and restricted cash	76,751	20,929
Cash, cash equivalents and restricted cash at beginning of period	157,515	120,901
Cash, cash equivalents and restricted cash at end of period	234,266	141,830
Cash paid during the period for:
Interest	7,044	9,738
Income taxes, net of refunds received of $2.0 million and $1.4 million	36,664	30,259
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	234,266	141,658
Restricted cash	0	172
Total cash, cash equivalents and restricted cash	$ 234,266	$ 141,830

XML

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020
Statement of Cash Flows [Abstract]
Income tax refunds	$ 2.0	$ 1.4

XML

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Tetra Tech Equity	Non-Controlling Interests
Beginning balance (in shares) at Sep. 29, 2019		54,565
Beginning balance at Sep. 29, 2019	$ 989,464	$ 546	$ 78,132	$ (160,584)	$ 1,071,192	$ 989,286	$ 178
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	129,234				129,205	129,205	29
Other comprehensive income (loss)	(17,154)			(17,148)		(17,148)	(6)
Distributions paid to noncontrolling interests	(69)						(69)
Cash dividends per common share	(25,590)				(25,590)	(25,590)
Stock-based compensation	13,494		13,494			13,494
Restricted & performance shares released (in shares)		210
Restricted & performance shares released	(11,143)	$ 2	(11,145)			(11,143)
Stock options exercised (in shares)		283
Stock options exercised	8,263	$ 3	8,260			8,263
Shares issued for Employee Stock Purchase Plan (in shares)		168
Shares issued for Employee Stock Purchase Plan	8,715	$ 1	8,714			8,715
Stock repurchases (in shares)		(1,338)
Stock repurchases	(102,188)	$ (13)	(97,455)		(4,720)	(102,188)
Ending balance (in shares) at Jun. 28, 2020		53,888
Ending balance at Jun. 28, 2020	993,026	$ 539	0	(177,732)	1,170,087	992,894	132
Beginning balance (in shares) at Mar. 29, 2020		54,142
Beginning balance at Mar. 29, 2020	950,238	$ 541	10,473	(199,391)	1,138,485	950,108	130
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	45,503				45,497	45,497	6
Other comprehensive income (loss)	21,655			21,659		21,659	(4)
Cash dividends per common share	(9,175)				(9,175)	(9,175)
Stock-based compensation	4,057		4,057			4,057
Restricted & performance shares released (in shares)		(5)
Restricted & performance shares released	(45)		(45)			(45)
Stock options exercised (in shares)		14
Stock options exercised	336		336			336
Stock repurchases (in shares)		(263)
Stock repurchases	(19,543)	$ (2)	(14,821)		(4,720)	(19,543)
Ending balance (in shares) at Jun. 28, 2020		53,888
Ending balance at Jun. 28, 2020	993,026	$ 539	0	(177,732)	1,170,087	992,894	132
Beginning balance (in shares) at Sep. 27, 2020		53,797
Beginning balance at Sep. 27, 2020	1,037,373	$ 538	0	(161,786)	1,198,567	1,037,319	54
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	149,900				149,856	149,856	44
Other comprehensive income (loss)	59,391			59,385		59,385	6
Distributions paid to noncontrolling interests	(9)						(9)
Cash dividends per common share	(29,241)				(29,241)	(29,241)
Stock-based compensation	16,261		16,261			16,261
Restricted & performance shares released (in shares)		213
Restricted & performance shares released	(17,589)	$ 2	(17,591)			(17,589)
Stock options exercised (in shares)		304
Stock options exercised	10,703	$ 4	10,699			10,703
Shares issued for Employee Stock Purchase Plan (in shares)		124
Shares issued for Employee Stock Purchase Plan	10,706	$ 1	10,705			10,706
Stock repurchases (in shares)		(367)
Stock repurchases	(45,000)	$ (4)	(20,074)		(24,922)	(45,000)
Ending balance (in shares) at Jun. 27, 2021		54,071
Ending balance at Jun. 27, 2021	1,192,495	$ 541	0	(102,401)	1,294,260	1,192,400	95
Beginning balance (in shares) at Mar. 28, 2021		54,158
Beginning balance at Mar. 28, 2021	1,147,228	$ 542	0	(115,056)	1,261,661	1,147,147	81
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	51,924				51,903	51,903	21
Other comprehensive income (loss)	12,657			12,655		12,655	2
Distributions paid to noncontrolling interests	(9)						(9)
Cash dividends per common share	(10,831)				(10,831)	(10,831)
Stock-based compensation	5,695		5,695			5,695
Restricted & performance shares released (in shares)		2
Restricted & performance shares released	(101)		(101)			(101)
Stock options exercised (in shares)		29
Stock options exercised	932	$ 1	931			932
Stock repurchases (in shares)		(118)
Stock repurchases	(15,000)	$ (2)	(6,525)		(8,473)	(15,000)
Ending balance (in shares) at Jun. 27, 2021		54,071
Ending balance at Jun. 27, 2021	$ 1,192,495	$ 541	$ 0	$ (102,401)	$ 1,294,260	$ 1,192,400	$ 95

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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares							3 Months Ended		9 Months Ended
	May 28, 2021	Feb. 26, 2021	Dec. 11, 2020	May 29, 2020	Feb. 28, 2020	Dec. 13, 2019	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Statement of Stockholders' Equity [Abstract]
Dividend paid per share (in dollars per share)	$ 0.20	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.20	$ 0.17	$ 0.54	$ 0.47

XML

Basis of Presentation

9 Months Ended

Jun. 27, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited consolidated financial statements and related notes of Tetra Tech, Inc. (“we,” “us,” “our” or "Tetra Tech") have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. They do not include all of the information and footnotes required by U.S. GAAP for complete financial statements and, therefore, should be read in conjunction with the audited consolidated financial statements and the notes contained in our Annual Report on Form 10-K for the fiscal year ended September 27, 2020.

These financial statements reflect all normal recurring adjustments that are considered necessary for a fair statement of our financial position, results of operations and cash flows for the interim periods presented. The results of operations and cash flows for any interim period are not necessarily indicative of results for the full year or for future years.

XML

Recent Accounting Pronouncements

9 Months Ended

Jun. 27, 2021

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board ("FASB") issued updated guidance, Accounting Standards Update ("ASU") 2016-13, related to the measurement of credit losses for certain financial assets. This guidance replaces the current incurred loss methodology with an expected credit loss methodology. It requires us to recognize an allowance equal to our current estimate of all contractual cash flows that we do not expect to collect. We adopted this guidance in the first quarter of fiscal 2021, and the adoption did not have a material impact on our consolidated financial statements. Our estimate considered relevant information about past events, current conditions, and reasonable and supportable forecasts impacting the collectability of the reported amounts.

In August 2018, the FASB issued updated guidance modifying certain fair value measurement disclosures. The guidance contains additional disclosures to enable users of the financial statements to better understand the entity’s assumptions used to develop significant unobservable inputs for Level 3 fair value measurements, but also eliminates the requirement for entities to disclose the amount of and reasons for transfers between Level 1 and Level 2 investments within the fair value hierarchy. We adopted this guidance in the first quarter of fiscal 2021, and the adoption did not have a material impact on our consolidated financial statements.

In December 2019, the FASB issued guidance simplifying the accounting for income taxes by removing certain exceptions to general principles in Topic 740 and amending certain existing guidance for clarity. This guidance is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2020 (first quarter of fiscal 2022 for us). Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In May 2020, the Securities and Exchange Commission issued guidance amending certain financial disclosures about acquired and disposed businesses. The amendments are designed to assist registrants in making more meaningful determinations of whether a subsidiary or an acquired or disposed business is significant, and to improve the related disclosure requirements. The guidance is effective for fiscal years beginning after December 31, 2020 (first quarter of fiscal 2022 for us). We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

XML

Revenue and Contract Balances

9 Months Ended

Jun. 27, 2021

Revenue from Contract with Customer [Abstract]

Revenue and Contract Balances

Revenue and Contract Balances

Disaggregation of Revenue

We disaggregate revenue by client sector and contract type, as we believe it best depicts how the nature, timing, and uncertainty of revenue and cash flows are affected by economic factors. The following tables present revenue disaggregated by client sector and contract type:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Client Sector:
U.S. state and local government	$	135,717	$	97,163	$	390,464	$	324,670
U.S. federal government (1)	265,999		243,414		799,560		731,977
U.S. commercial	153,100		168,491		454,607		510,770
International (2)	246,817		200,703		676,869		674,110
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Contract Type:
Fixed-price	$	294,568	$	275,810	$	841,118	$	802,477
Time-and-materials	379,705		309,123		1,082,143		1,047,900
Cost-plus	127,360		124,838		398,239		391,150
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527

(1)     Includes revenue generated under U.S. federal government contracts performed outside the United States.

(2) Includes revenue generated from foreign operations, primarily in Canada, Australia, the United Kingdom, and revenue generated from non-U.S. clients.

Other than the U.S. federal government, no single client accounted for more than 10% of our revenue for the three and nine months ended June 27, 2021 and June 28, 2020.

Contract Assets and Contract Liabilities

We invoice customers based on the contractual terms of each contract. However, the timing of revenue recognition may differ from the timing of invoice issuance.

Contract assets represent revenue recognized in excess of the amounts for which we have the contractual right to bill our customers. Such amounts are recoverable from customers based upon various measures of performance, including achievement of certain milestones or completion of a contract. In addition, many of our time and materials arrangements are billed in arrears pursuant to contract terms that are standard within the industry, resulting in contract assets and/or unbilled receivables being recorded, as revenue is recognized in advance of billings. Contract retentions, included in contract assets, represent amounts withheld by clients until certain conditions are met or the project is completed, which may extend beyond one year.

Contract liabilities consist of billings in excess of revenue recognized. Contract liabilities decrease as we recognize revenue from the satisfaction of the related performance obligation and increase as billings in advance of revenue recognition occur. Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. There were no substantial non-current contract assets or liabilities for the periods presented. Net contract assets/liabilities consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Contract assets (1)	$	91,405	$	92,632
Contract liabilities	(179,127)		(171,905)
Net contract liabilities	$	(87,722)	$	(79,273)

(1)     Includes $8.5 million and $12.3 million of contract retentions as of June 27, 2021 and September 27, 2020, respectively.

In the first nine months of fiscal 2021 and 2020, we recognized revenue of approximately $108 million and $106 million, respectively, from amounts included in the contract liability balances at the end of fiscal 2020 and 2019, respectively.

We recognize revenue primarily using the cost-to-cost measure of progress to estimate progress towards completion. Changes in those estimates could result in the recognition of cumulative catch-up adjustments to the contract’s inception-to-date revenue, costs and profit in the period in which such changes are made. As a result, we recognized net favorable operating income adjustments of $1.7 million and $2.8 million in the third quarter and first nine months of fiscal 2021, respectively, compared to a net unfavorable adjustment of $2.8 million in the first nine months of fiscal 2020 (all in the second quarter). Changes in revenue and cost estimates could also result in a projected loss, determined at the contract level, which would be recorded immediately in earnings. As of June 27, 2021 and September 27, 2020, our consolidated balance sheets included liabilities for anticipated losses of $8.0 million and $13.2 million, respectively. The estimated cost to complete these related contracts as of June 27, 2021 and September 27, 2020 was approximately $81 million and $118 million, respectively.

Accounts Receivable, Net

Net accounts receivable consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Billed	$	431,613	$	402,818
Unbilled	236,174		253,364
Total accounts receivable	667,787		656,182
Allowance for doubtful accounts	(3,394)		(7,147)
Total accounts receivable, net	$	664,393	$	649,035

Billed accounts receivable represent amounts billed to clients that have not been collected. Unbilled accounts receivable, which represent an unconditional right to payment subject only to the passage of time, include unbilled amounts typically resulting from revenue recognized but not yet billed pursuant to contract terms or billed after the period end date. Substantially all of our unbilled receivables at June 27, 2021 are expected to be billed and collected within 12 months. The allowance for doubtful accounts represents amounts that are expected to become uncollectible or unrealizable in the future. We determine an estimated allowance for uncollectible accounts based on management's consideration of trends in the actual and forecasted credit quality of our clients, including delinquency and payment history; type of client, such as a government agency or a commercial sector client; and general economic and industry conditions, including the potential impacts of the coronavirus disease 2019 ("COVID-19") pandemic, that may affect our clients' ability to pay. The $3.8 million decline in our allowance for doubtful accounts in the first nine months of fiscal 2021 primarily reflects the collection of accounts receivable we previously determined were likely uncollectible related to our Canadian turn-key pipeline activities that we decided to dispose of in the fourth quarter of fiscal 2019.

Total accounts receivable at June 27, 2021 and September 27, 2020 included approximately $11 million for each period (all in our Remediation Construction Management ("RCM") segment), related to claims, including requests for equitable adjustment, on contracts that provide for price redetermination. Claims are amounts in excess of agreed contract prices that we seek to collect from our clients or other third parties for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price, or other causes of unanticipated additional costs. Factors considered in determining whether revenue associated with claims (including change orders in dispute and unapproved change orders in regards to both scope and price) should be recognized include the following: (a) the contract or other evidence provides a legal basis for the claim, (b) additional costs were caused by circumstances that were unforeseen at the contract date and not the result of deficiencies in our performance, (c) claim-related costs are identifiable and considered reasonable in view of the work performed, and (d) evidence supporting the claim is objective and verifiable. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period when a client agreement is obtained, or a claims resolution occurs.

We regularly evaluate all unsettled claim amounts and record appropriate adjustments to revenue when it is probable that the claim will result in a different contract value than the amount previously estimated. In the first nine months of fiscal 2021 (all in the second quarter), we recognized increases to revenue and related gains of $2.8 million in our Commercial/

International Services Group ("CIG"). In the first nine months of fiscal 2020, we recorded net losses in operating income related to claims of $4.4 million in our CIG segment.

No single client accounted for more than 10% of our accounts receivable at June 27, 2021 and September 27, 2020.

Remaining Unsatisfied Performance Obligations (“RUPOs”)

Our RUPOs represent a measure of the total dollar value of work to be performed on contracts awarded and in progress. We had $3.2 billion of RUPOs as of June 27, 2021. RUPOs increase with awards from new contracts or additions on existing contracts and decrease as work is performed and revenue is recognized on existing contracts. RUPOs may also decrease when projects are canceled or modified in scope. We include a contract within our RUPOs when the contract is awarded and an agreement on contract terms has been reached.

We expect to satisfy our RUPOs as of June 27, 2021 over the following periods:

	Amount
	(in thousands)
Within 12 months	$	1,950,987
Beyond	1,280,146
Total	$	3,231,133

Although RUPOs reflect business that is considered to be firm, cancellations, deferrals or scope adjustments may occur. RUPOs are adjusted to reflect any known project cancellations, revisions to project scope and cost, foreign currency exchange fluctuations and project deferrals, as appropriate. Our operations and maintenance contracts can generally be terminated by the clients without a substantive financial penalty. Therefore, the remaining performance obligations on such contracts are limited to the notice period required for the termination (usually 30, 60, or 90 days).

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Acquisitions

9 Months Ended

Jun. 27, 2021

Business Combination and Asset Acquisition [Abstract]

Acquisitions

Acquisitions

In the second quarter of fiscal 2021, we acquired Coanda Research and Development Corporation ("CRD"), based in Burnaby, British Columbia. CRD provides world-class expertise in computational fluid dynamics and utilizes industry-leading capabilities to solve complex engineering science problems for commercial customers, across a broad range of industries and is part of our CIG segment.

In the third quarter of fiscal 2021, we acquired The Kaizen Company (“KZN”) and IBRA-RMAC Automation Solutions (“IRM”). KZN is based in Washington, DC and provides international development advisory and management consulting services offering a suite of innovative tools that support advanced solutions in health, education, governance, peace and stability, and sustainable economic growth. IRM is based in San Diego, California, and provides digital water transformation consulting services and an innovative suite of tools to address complex water system modernization challenges. Both KZN and IRM are part of our Government Services Group ("GSG") segment.

The total fair value of the purchase price of these three acquisitions completed during the first nine months of fiscal 2021 was $29.1 million. This amount was comprised of $18.9 million in initial cash payments made to the sellers, and $10.2 million for the estimated fair value of contingent earn-out obligations, with a maximum of $19.0 million, based upon the achievement of specified operating income targets in each of the three to four years following the acquisition.

We acquired Segue Technologies, Inc. ("SEG"), a leading information technology management consulting firm based in Arlington, Virginia and BlueWater Federal Solutions, Inc. ("BWF"), a leading information technology management consulting firm based in Chantilly, Virginia in the second and fourth quarters of fiscal 2020, respectively. SEG and BWF are both part of our GSG segment. The total fair value of the purchase price for these two acquisitions was $88.6 million. This amount was comprised of $71.4 million in initial cash payments made to the sellers, $0.7 million of payables related to estimated post-closing adjustments for net assets acquired, and $16.5 million for the estimated fair value of contingent earn-out obligations, with a maximum of $28.0 million, based upon the achievement of specified operating income targets in each of the three years following the acquisitions.

Goodwill additions resulting from the recent acquisitions of KZN, IRM and CRD are primarily attributable to the significant technical expertise residing in an embedded workforce that is sought out by clients, and the synergies expected to arise after the acquisitions. The fiscal 2020 goodwill additions represent the value of a workforce with distinct expertise in the high-end information technology field, in the areas of data analytics, modeling and simulation, cloud, and agile software development. In addition, these acquired capabilities, when combined with our existing global consulting and engineering business, result in opportunities that allow us to provide services under contracts that could not have been pursued individually by either us or the acquired companies. The results of these acquisitions were included in our consolidated financial statements from their respective closing dates. These acquisitions were not considered material, individually or in the aggregate, to our consolidated financial statements. As a result, no pro forma information has been provided.

Backlog, client relations and trade name intangible assets include the fair value of existing contracts and the underlying customer relationships with lives ranging from one to ten years, and trade names with lives ranging from three to five years. For detailed information regarding our intangible assets, see Note 5, “Goodwill and Intangible Assets”.

Most of our acquisition agreements include contingent earn-out agreements, which are generally based on the achievement of future operating income thresholds. The contingent earn-out arrangements are based on our valuations of the acquired companies and reduce the risk of overpaying for acquisitions if the projected financial results are not achieved. The fair values of any earn-out arrangements are included as part of the purchase price of the acquired companies on their respective acquisition dates. For each transaction, we estimate the fair value of contingent earn-out payments as part of the initial purchase price and record the estimated fair value of contingent consideration as a liability in “Current contingent earn-out liabilities” and “Long-term contingent earn-out liabilities” on the consolidated balance sheets. We consider several factors when determining that contingent earn-out liabilities are part of the purchase price, including the following: (1) the valuation of our acquisitions is not supported solely by the initial consideration paid, and the contingent earn-out formula is a critical and material component of the valuation approach to determining the purchase price; and (2) the former owners of acquired companies that remain as key employees receive compensation other than contingent earn-out payments at a reasonable level compared with the compensation of our other key employees. The contingent earn-out payments are not affected by employment termination.

We measure our contingent earn-out liabilities at fair value on a recurring basis using significant unobservable inputs classified within Level 3 of the fair value hierarchy. We use a probability-weighted discounted income approach as a valuation technique to convert future estimated cash flows to a single present value amount. The significant unobservable inputs used in the fair value measurements are operating income projections over the earn-out period (generally two or three years), and the probability outcome percentages we assign to each scenario. Significant increases or decreases to either of these inputs in isolation would result in a significantly higher or lower liability, with a higher liability capped by the contractual maximum of the contingent earn-out obligation. Ultimately, the liability will be equivalent to the amount paid, and the difference between the fair value estimate and amount paid will be recorded in earnings. The amount paid that is less than or equal to the contingent earn-out liability on the acquisition date is reflected as cash used in financing activities in our consolidated statements of cash flows. Any amount paid in excess of the contingent earn-out liability on the acquisition date is reflected as cash used in operating activities in our consolidated statements of cash flows.

We evaluated our estimated fair value of contingent consideration liabilities for each individual acquisition on a quarterly basis, which included a review of their financial results to-date, the status of ongoing projects in their RUPOs, and the inventory of prospective new contract awards. We also considered the potential impact of the global economic disruption due to the COVID-19 pandemic on our operating income projections over the various earn-out periods. The updated fair value could differ materially from the initial estimates. Changes in the estimated fair value of our contingent earn-out liabilities related to the time component of the present value calculation are reported in interest expense. During the first nine months of fiscal 2021 and 2020, we recorded adjustments to our contingent earn-out liabilities and reported a net gain in operating income of $0.2 million and $1.5 million, respectively (substantially all in the second quarters of fiscal 2021 and 2020).

At June 27, 2021, there was a total potential maximum of $68.2 million of outstanding contingent consideration related to acquisitions. Of this amount, $31.2 million was estimated as the fair value and accrued on our consolidated balance sheet. If the global economic disruption related to the COVID-19 pandemic is prolonged, we could have significant reductions in our contingent earn-out liabilities and related gains in our operating income in future periods.

Subsequent Event. On July 26, 2021, we acquired Hoare Lea, a leader in sustainable engineering design. Based in Bristol, United Kingdom, Hoare Lea was established in 1862 and is an award-winning high-end consultancy firm in the United Kingdom, with more than 900 employees, providing innovative solutions to complex engineering and design challenges for sustainable infrastructure and high performance buildings. Hoare Lea will be included in our CIG segment.

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Goodwill and Intangible Assets

9 Months Ended

Jun. 27, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

The following table summarizes the changes in the carrying value of goodwill by reportable segment:

	GSG		CIG		Total
	(in thousands)
Balance at September 27, 2020	$	516,315	$	477,183	$	993,498
Acquisition activity	14,891		3,675		18,566
Translation	10,099		29,633		39,732
Balance at June 27, 2021	$	541,305	$	510,491	$	1,051,796

Our goodwill balances reflect foreign currency translation adjustments related to our foreign subsidiaries with functional currencies that are different than our reporting currency. These amounts are presented net of reductions from historical impairment adjustments. The gross amounts of goodwill for GSG were $559.0 million and $534.0 million at June 27, 2021 and September 27, 2020, respectively, excluding accumulated impairment of $17.7 million for each period. The gross amounts of goodwill for CIG were $632.0 million and $598.7 million at June 27, 2021 and September 27, 2020, respectively, excluding accumulated impairment of $121.5 million for each period.

We perform our annual goodwill impairment review at the beginning of our fiscal fourth quarter. Our most recent annual review at June 29, 2020 (i.e. the first day of our fourth quarter in fiscal 2020) indicated that we had no impairment of goodwill, and all of our reporting units had estimated fair values that were in excess of their carrying values, including goodwill. All of our reporting units had estimated fair values that exceeded their carrying values by more than 80%, with the exception of our former Asia/Pacific ("ASP") reporting unit, which was in our CIG reportable segment. Our former ASP reporting unit had an estimated fair value that exceeded its carrying value by less than 20%.

We also regularly evaluate whether events and circumstances have occurred that may indicate a potential change in the recoverability of goodwill. We perform interim goodwill impairment reviews between our annual reviews if certain events and circumstances have occurred, such as a deterioration in general economic conditions; an increase in the competitive environment; a change in management, key personnel, strategy or customers; negative or declining cash flows; or a decline in actual or planned revenue or earnings compared with actual and projected results of relevant prior periods. Although we believe that our estimates of fair value for these reporting units are reasonable, if financial performance for these reporting units falls significantly below our expectations or market prices for similar business decline, the goodwill for these reporting units could become impaired.    

On September 2, 2020, Australia announced that it had fallen into economic recession, defined as two consecutive quarters of negative growth, for the first time since 1991 including 7% negative growth in the quarter ending June 30, 2020. This prompted a strategic review of our former ASP reporting unit. As a result of the economic recession in Australia, our revenue growth and profit margin forecasts for our former ASP reporting unit declined from the previous forecast used for our annual goodwill impairment review as of June 29, 2020. We also performed an interim goodwill impairment review of our former ASP reporting unit in September 2020 and recorded a $15.8 million goodwill impairment charge. As a result of the impairment charge, the estimated fair value of our former ASP reporting unit equaled its carrying value of $144.9 million, including $95.5 million of goodwill, at September 27, 2020. On September 28, 2020 (the first day of our fiscal 2021), we merged our former ASP reporting unit into our Client Account Management reporting unit.

The following table presents the gross amount and accumulated amortization of our acquired identifiable intangible assets with finite useful lives included in “Intangible assets, net” on the consolidated balance sheets:

	June 27, 2021					September 27, 2020
	Weighted- Average Remaining Life (in Years)	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
	($ in thousands)
Client relations	2.5	$	48,444	$	(42,587)	$	60,775	$	(53,392)
Backlog	0.7	32,292		(30,027)		37,682		(32,761)
Trade names	1.6	7,162		(6,124)		7,964		(6,325)
Total		$	87,898	$	(78,738)	$	106,421	$	(92,478)

Amortization expense for the three and nine months ended June 27, 2021 was $2.2 million and $7.8 million, respectively, compared to $2.6 million and $9.0 million for the prior-year periods. Estimated amortization expense for the remainder of fiscal 2021 and succeeding years is as follows:

	Amount
	(in thousands)
2021	$	2,093
2022	4,072
2023	2,138
2024	754
2025	103
Total	$	9,160

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Property and Equipment

9 Months Ended

Jun. 27, 2021

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Equipment, furniture and fixtures	$	98,289	$	90,942
Leasehold improvements	36,280		34,569
Total property and equipment	134,569		125,511
Accumulated depreciation	(98,568)		(90,004)
Property and equipment, net	$	36,001	$	35,507

The depreciation expense related to property and equipment was $3.1 million and $9.0 million for the three and nine months ended June 27, 2021, respectively, compared to $3.7 million and $10.1 million for the prior-year periods.

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Stock Repurchase and Dividends

9 Months Ended

Jun. 27, 2021

Stock Repurchase And Dividends [Abstract]

Stock Repurchase and Dividends

Stock Repurchase and DividendsOn January 27, 2020, the Board of Directors authorized a new $200 million stock repurchase program, which was included in our remaining balance of $207.8 million as of fiscal 2020 year-end. In the first nine months of fiscal 2021, we repurchased and settled 368,177 shares with an average price of $122.22 per share for a total cost of $45.0 million in the open market. At June 27, 2021, we had a remaining balance of $162.8 million under our stock repurchase program.

The following table presents dividends declared and paid in the first nine months of fiscal 2021 and 2020:

Declare Date	Dividend Paid Per Share		Record Date	Payment Date	Dividend Paid (in thousands)
November 9, 2020	$	0.17	November 30, 2020	December 11, 2020	$	9,198
January 25, 2021	$	0.17	February 10, 2021	February 26, 2021	9,212
April 26, 2021	$	0.20	May 12, 2021	May 28, 2021	10,831
Total dividend paid as of June 27, 2021					$	29,241
November 11, 2019	$	0.15	December 2, 2019	December 13, 2019	$	8,190
January 27, 2020	$	0.15	February 12, 2020	February 28, 2020	8,225
April 27, 2020	$	0.17	May 13, 2020	May 29, 2020	9,175
Total dividend paid as of June 28, 2020					$	25,590

Subsequent Event.  On July 26, 2021, the Board of Directors declared a quarterly cash dividend of $0.20 per share payable on September 3, 2021 to stockholders of record as of the close of business on August 20, 2021.

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Leases

9 Months Ended

Jun. 27, 2021

Leases [Abstract]

Leases

Leases

In February 2016, the FASB issued ASU 2016-02 “Leases (Topic 842)”, which is a new standard related to leases to increase transparency and comparability among organizations by requiring the recognition of right-of-use (“ROU”) assets obtained in exchange for lease liabilities on the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases.

We elected to adopt the standard, and available practical expedients, effective September 30, 2019 (the first day of our fiscal 2020). These practical expedients allowed us to keep the lease classification assessed under the previous lease accounting standard (ASC 840) without reassessment under the new standard, and allowed all separate lease components, including non-lease components, to be accounted for as a single lease component for all existing leases prior to adoption of the new standard.

We adopted this new standard under the modified retrospective transition approach without adjusting comparative periods in the financial statements, as allowed under Leases (Topic 842), and implemented internal controls and key system functionality to enable the preparation of financial information on adoption. The standard had a material impact on our consolidated balance sheets but did not have an impact on the consolidated income statements. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases, while accounting for finance leases remained substantially unchanged. Our finance leases are primarily for certain information technology equipment and the related ROU and lease liabilities were immaterial, and included in "Other current liabilities" and "Other long-term liabilities" accordingly on our consolidated balance sheets at June 27, 2021 and September 27, 2020.

We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets and current and long-term operating lease liabilities in the consolidated balance sheets.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, incremental borrowing rates are used based on the information available at commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for operating lease payments is recognized on a straight-line basis over the lease term.

Our operating leases are primarily for corporate and project office spaces. To a much lesser extent, we have operating leases for vehicles and equipment. Our operating leases have remaining lease terms of one month to twelve years, some of which may include options to extend the leases for up to five years.

The components of lease costs are as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating lease cost	$	22,423	$	21,152	$	67,132	$	63,919
Sublease income	(21)		(573)		(81)		(1,688)
Other	—		18		—		54
Total lease cost	$	22,402	$	20,597	$	67,051	$	62,285

Supplemental cash flow information related to leases is as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating cash flows for operating leases	$	20,217	$	18,634	$	56,616	$	60,138
Right-of-use assets obtained in exchange for new operating lease liabilities	$	9,672	$	7,505	$	43,394	$	305,141

Supplemental balance sheet and other information related to leases are as follows:

	Balance at
	June 27, 2021			September 27, 2020
	(in thousands)
Operating leases:
Right-of-use assets	$	213,236		$	239,396
Lease liabilities:
Current	64,911			69,650
Long-term	173,080			191,955
Total operating lease liabilities	$	237,991		$	261,605
Weighted-average remaining lease term:
Operating leases	5 years			5 years
Weighted-average discount rate:
Operating leases	2.3		%	2.5		%

As of June 27, 2021, we do not have any material additional operating leases that have not yet commenced.

A maturity analysis of the future undiscounted cash flows associated with our operating lease liabilities is as follows:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
2021	$	18,813	$	75,074
2022	70,378		64,972
2023	49,755		44,733
2024	36,221		30,991
2025	26,810		21,466
Beyond	52,411		44,169
Total lease payments	254,388		281,405
Less: imputed interest	(16,397)		(19,800)
Total present value of lease liabilities	$	237,991	$	261,605

Leases

Leases

In February 2016, the FASB issued ASU 2016-02 “Leases (Topic 842)”, which is a new standard related to leases to increase transparency and comparability among organizations by requiring the recognition of right-of-use (“ROU”) assets obtained in exchange for lease liabilities on the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases.

We elected to adopt the standard, and available practical expedients, effective September 30, 2019 (the first day of our fiscal 2020). These practical expedients allowed us to keep the lease classification assessed under the previous lease accounting standard (ASC 840) without reassessment under the new standard, and allowed all separate lease components, including non-lease components, to be accounted for as a single lease component for all existing leases prior to adoption of the new standard.

We adopted this new standard under the modified retrospective transition approach without adjusting comparative periods in the financial statements, as allowed under Leases (Topic 842), and implemented internal controls and key system functionality to enable the preparation of financial information on adoption. The standard had a material impact on our consolidated balance sheets but did not have an impact on the consolidated income statements. The most significant impact was the recognition of ROU assets and lease liabilities for operating leases, while accounting for finance leases remained substantially unchanged. Our finance leases are primarily for certain information technology equipment and the related ROU and lease liabilities were immaterial, and included in "Other current liabilities" and "Other long-term liabilities" accordingly on our consolidated balance sheets at June 27, 2021 and September 27, 2020.

We determine if an arrangement is a lease at inception. Operating leases are included in operating lease ROU assets and current and long-term operating lease liabilities in the consolidated balance sheets.

ROU assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, incremental borrowing rates are used based on the information available at commencement date in determining the present value of lease payments. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. Lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option. Lease expense for operating lease payments is recognized on a straight-line basis over the lease term.

Our operating leases are primarily for corporate and project office spaces. To a much lesser extent, we have operating leases for vehicles and equipment. Our operating leases have remaining lease terms of one month to twelve years, some of which may include options to extend the leases for up to five years.

The components of lease costs are as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating lease cost	$	22,423	$	21,152	$	67,132	$	63,919
Sublease income	(21)		(573)		(81)		(1,688)
Other	—		18		—		54
Total lease cost	$	22,402	$	20,597	$	67,051	$	62,285

Supplemental cash flow information related to leases is as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating cash flows for operating leases	$	20,217	$	18,634	$	56,616	$	60,138
Right-of-use assets obtained in exchange for new operating lease liabilities	$	9,672	$	7,505	$	43,394	$	305,141

Supplemental balance sheet and other information related to leases are as follows:

	Balance at
	June 27, 2021			September 27, 2020
	(in thousands)
Operating leases:
Right-of-use assets	$	213,236		$	239,396
Lease liabilities:
Current	64,911			69,650
Long-term	173,080			191,955
Total operating lease liabilities	$	237,991		$	261,605
Weighted-average remaining lease term:
Operating leases	5 years			5 years
Weighted-average discount rate:
Operating leases	2.3		%	2.5		%

As of June 27, 2021, we do not have any material additional operating leases that have not yet commenced.

A maturity analysis of the future undiscounted cash flows associated with our operating lease liabilities is as follows:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
2021	$	18,813	$	75,074
2022	70,378		64,972
2023	49,755		44,733
2024	36,221		30,991
2025	26,810		21,466
Beyond	52,411		44,169
Total lease payments	254,388		281,405
Less: imputed interest	(16,397)		(19,800)
Total present value of lease liabilities	$	237,991	$	261,605

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Stockholders' Equity and Stock Compensation Plans	9 Months Ended
	Jun. 27, 2021
Stockholders' Equity Note [Abstract]
Stockholders' Equity and Stock Compensation Plans	Stockholders’ Equity and Stock Compensation Plans We recognize the fair value of our stock-based awards as compensation expense on a straight-line basis over the requisite service period in which the award vests. Stock-based compensation expense for the three and nine months ended June 27, 2021 was $5.7 million and $16.3 million, respectively, compared to $4.1 million and $13.5 million for the same periods last year. Most of these amounts were included in selling, general and administrative expenses on our consolidated statements of income. In the first nine months of fiscal 2021, we awarded 57,542 performance share units (“PSUs”) (all in the first quarter) to our non-employee directors and executive officers at a fair value of $153.03 per share on the award date. All PSUs are performance-based and vest, if at all, after the conclusion of the three-year performance period. The number of PSUs that ultimately vest is based 50% on the growth in our diluted earnings per share and 50% on our relative total shareholder return over the vesting period. Additionally, we awarded 117,084 restricted stock units (“RSUs”) to our non-employee directors, executive officers and employees at a fair value of $121.97 per share on the award date. All executive officer and employee RSUs have time-based vesting over a four-year period, and the non-employee director RSUs vest after one year.

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Earnings per Share ("EPS")

9 Months Ended

Jun. 27, 2021

Earnings Per Share [Abstract]

Earnings per Share ("EPS")

Earnings per Share (“EPS”)Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding, less unvested restricted stock for the period. Diluted EPS is computed by dividing net income by the weighted-average number of common shares outstanding and dilutive potential common shares for the period. Potential common shares include the weighted-average dilutive effects of outstanding stock options and unvested restricted stock using the treasury stock method.

The following table presents the number of weighted-average shares used to compute basic and diluted EPS:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	51,903	$	45,497	$	149,856	$	129,205
Weighted-average common shares outstanding – basic	54,117		53,985		54,095		54,366
Effect of dilutive stock options and unvested restricted stock	549		707		603		795
Weighted-average common shares outstanding – diluted	54,666		54,692		54,698		55,161
Earnings per share attributable to Tetra Tech:
Basic	$	0.96	$	0.84	$	2.77	$	2.38
Diluted	$	0.95	$	0.83	$	2.74	$	2.34

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Income Taxes

9 Months Ended

Jun. 27, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The effective tax rates for the first nine months of fiscal 2021 and 2020 were 20.4% and 21.2%, respectively. Income tax expense was reduced by $8.7 million and $7.0 million of excess tax benefits on share-based payments in the first nine months of fiscal 2021 and 2020, respectively. Excluding the impact of the excess tax benefits on share-based payments, our effective tax rates in the first nine months fiscal 2021 and 2020 were 25.0% and 25.4%, respectively.

As of June 27, 2021 and September 27, 2020, the liability for income taxes associated with uncertain tax positions was $12.8 million and $9.7 million, respectively. These uncertain tax positions substantially relate to ongoing examinations, which are not likely to be resolved within the next 12 months. These liabilities represent our current estimates of the additional tax liabilities that we may be assessed when the related audits are concluded. If these audits are resolved in a manner more unfavorable than our current expectations, our additional tax liabilities could be materially higher than the amounts currently recorded resulting in additional tax expense.

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Reportable Segments

9 Months Ended

Jun. 27, 2021

Segment Reporting [Abstract]

Reportable Segments

Reportable Segments

We manage our operations under two reportable segments. Our GSG reportable segment primarily includes activities with U.S. government clients (federal, state and local) and all activities with development agencies worldwide. Our CIG reportable segment primarily includes activities with U.S. commercial clients and international clients other than development agencies. Additionally, we continue to report the results of the wind-down of our non-core construction activities in the RCM reportable segment. Substantially, there has been no remaining backlog for RCM since fiscal 2018 as the projects were complete.

GSG provides consulting and engineering services primarily to U.S. government clients (federal, state and local) and development agencies worldwide. GSG supports U.S. government civilian and defense agencies with services in water, environment, sustainable infrastructure, information technology, and disaster management. GSG also provides engineering design services for U.S. municipal and commercial clients, especially in water infrastructure, solid waste, and high-end sustainable infrastructure designs. GSG also leads our support for development agencies worldwide, especially in the United States, United Kingdom, and Australia.

CIG primarily provides consulting and engineering services to U.S. commercial clients, and international clients that include both commercial and government sectors. CIG supports commercial clients across the Fortune 500, renewable energy, industrial, manufacturing, and aerospace markets. CIG also provides sustainable infrastructure and related environmental, engineering and project management services to commercial and local government clients across Canada, in Asia Pacific (primarily Australia and New Zealand), the United Kingdom, as well as Brazil and Chile.

Management evaluates the performance of these reportable segments based upon their respective segment operating income before the effect of amortization expense related to acquisitions, and other unallocated corporate expenses. We account

for inter-segment revenues and transfers as if they were to third parties; that is, by applying a negotiated fee onto the costs of the services performed. All significant intercompany balances and transactions are eliminated in consolidation.

The following tables summarize financial information regarding our reportable segments:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Revenue
GSG	$	488,700	$	432,180	$	1,431,151	$	1,326,487
CIG	327,434		291,021		931,586		950,597
RCM	143		48		613		198
Elimination of inter-segment revenue	(14,644)		(13,478)		(41,850)		(35,755)
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Income from operations
GSG	$	49,297	$	43,100	$	143,106	$	120,495
CIG	34,017		28,848		89,886		82,156
RCM	—		(1)		1		—
Corporate (1)	(13,507)		(8,422)		(36,128)		(28,295)
Total	$	69,807	$	63,525	$	196,865	$	174,356

(1) Includes amortization of intangibles, other costs and other income not allocable to our reportable segments.

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Total Assets
GSG	$	642,830	$	649,417
CIG	470,009		479,238
RCM	11,760		14,258
Corporate (1)	1,386,322		1,235,645
Total	$	2,510,921	$	2,378,558

(1) Corporate assets consist of intercompany eliminations and assets not allocated to our reportable segments including goodwill, intangible assets, deferred income taxes and certain other assets.

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Fair Value Measurements	9 Months Ended
	Jun. 27, 2021
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value MeasurementsThe fair value of long-term debt was determined using the present value of future cash flows based on the borrowing rates currently available for debt with similar terms and maturities (Level 2 measurement, as described in “Critical Accounting Policies and Estimates” in our Annual Report on Form 10-K for the fiscal year ended September 27, 2020). The carrying value of our long-term debt approximated fair value at June 27, 2021 and September 27, 2020. At June 27, 2021, we had borrowings of $246.5 million outstanding under our Amended Credit Agreement, which were used to fund business acquisitions, working capital needs, stock repurchases, dividends, capital expenditures and contingent earn-outs.

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Derivative Financial Instruments

9 Months Ended

Jun. 27, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

Derivative Financial InstrumentsWe often use certain interest rate derivative contracts to hedge interest rate exposures on our variable rate debt. Also, we may enter in foreign currency derivative contracts with financial institutions to reduce the risk that cash flows and earnings could adversely be affected by foreign currency exchange rate fluctuations. Our hedging program is not designated for trading or speculative purposes.

We recognize derivative instruments as either assets or liabilities on the accompanying consolidated balance sheets at fair value. We record changes in the fair value (i.e., gains or losses) of the derivatives that have been designated as cash flow hedges in our consolidated balance sheets as accumulated other comprehensive income, and in our consolidated statements of income for those derivatives designated as fair value hedges.

In fiscal 2018, we entered into five interest rate swap agreements that we designated as cash flow hedges to fix the interest rate on the borrowings under our term loan facility. As of June 27, 2021, the notional principal of our outstanding interest swap agreements was $218.8 million ($43.8 million each.) The interest rate swaps have a fixed interest rate of 2.79% and expire in July 2023 for all five agreements. At June 27, 2021 and September 27, 2020, the fair value of the effective portion of our interest rate swap agreements designated as cash flow hedges before tax effect was $(10.6) million and $(15.5) million, which were reported in "Other current liabilities" on our consolidated balance sheets. Additionally, the related gains of $1.5 million and $4.9 million for the three and nine months ended June 27, 2021, respectively, compared to related losses of $0.0 million and $5.7 million for the prior-year periods, were recognized and reported on our consolidated statements of comprehensive income. We expect to reclassify $5.7 million from accumulated other comprehensive loss to interest expense within the next twelve months. There were no other derivative instruments designated as hedging instruments for the first nine months of fiscal 2021.

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Reclassifications Out of Accumulated Other Comprehensive Income

9 Months Ended

Jun. 27, 2021

Equity [Abstract]

Reclassifications Out of Accumulated Other Comprehensive Income

Reclassifications Out of Accumulated Other Comprehensive Income

The accumulated balances and activities for the three and nine months ended June 27, 2021 and June 28, 2020 related to reclassifications out of accumulated other comprehensive income are summarized as follows:

	Three Months Ended
	Foreign Currency Translation Adjustments		Gain (Loss) on Derivative Instruments		Accumulated Other Comprehensive Income (Loss)
	(in thousands)
Balance at March 29, 2020	$	(182,822)	$	(16,569)	$	(199,391)
Other comprehensive income before reclassifications	21,689		1,279		22,968
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(1,309)		(1,309)
Net current-period other comprehensive income (loss)	21,689		(30)		21,659
Balance at June 28, 2020	$	(161,133)	$	(16,599)	$	(177,732)
Balance at March 28, 2021	$	(102,911)	$	(12,145)	$	(115,056)
Other comprehensive income before reclassifications	11,157		2,981		14,138
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(1,483)		(1,483)
Net current-period other comprehensive income	11,157		1,498		12,655
Balance at June 27, 2021	$	(91,754)	$	(10,647)	$	(102,401)
	Nine Months Ended
	Foreign Currency Translation Adjustments		Gain (Loss) on Derivative Instruments		Accumulated Other Comprehensive Income (Loss)
	(in thousands)
Balance at September 29, 2019	$	(149,711)	$	(10,873)	$	(160,584)
Other comprehensive loss before reclassifications	(11,422)		(3,200)		(14,622)
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(2,526)		(2,526)
Net current-period other comprehensive loss	(11,422)		(5,726)		(17,148)
Balance at June 28, 2020	$	(161,133)	$	(16,599)	$	(177,732)
Balance at September 27, 2020	$	(146,275)	$	(15,511)	$	(161,786)
Other comprehensive income before reclassifications	54,521		9,341		63,862
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(4,477)		(4,477)
Net current-period other comprehensive income	54,521		4,864		59,385
Balance at June 27, 2021	$	(91,754)	$	(10,647)	$	(102,401)
(1) This accumulated other comprehensive component is reclassified to “Interest expense” in our consolidated statements of income. See Note 14, “Derivative Financial Instruments”, for more information.

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Commitments and Contingencies	9 Months Ended
	Jun. 27, 2021
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are subject to certain claims and lawsuits typically filed against the consulting and engineering profession, alleging primarily professional errors or omissions. We carry professional liability insurance, subject to certain deductibles and policy limits, against such claims. However, in some actions, parties are seeking damages that exceed our insurance coverage or for which we are not insured. While management does not believe that the resolution of these claims will have a material adverse effect, individually or in aggregate, on our financial position, results of operations or cash flows, management acknowledges the uncertainty surrounding the ultimate resolution of these matters. On July 15, 2019, following an initial January 14, 2019 filing, the Civil Division of the United States Attorney's Office filed an amended complaint in intervention in three qui tam actions filed against our subsidiary, Tetra Tech EC, Inc. ("TtEC"), in the U.S. District Court for the Northern District of California. The complaint alleges False Claims Act violations and breach of contract related to TtEC's contracts to perform environmental remediation services at the former Hunters Point Naval Shipyard in San Francisco, California. TtEC disputes the claims and will defend this matter vigorously. We are currently unable to determine the probability of the outcome of this matter or the range of reasonably possible loss, if any.

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Related Party Transactions

9 Months Ended

Jun. 27, 2021

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

We often provide services to unconsolidated joint ventures. Revenue generated from the services we provided to unconsolidated joint ventures for the three and nine months of fiscal 2021 was $24.2 million and $69.8 million, respectively, compared to $19.0 million and $67.0 million for the same periods last year. Related reimbursable costs for the three and nine months of fiscal 2021 were $23.2 million and $67.2 million, respectively, compared to $18.4 million and $66.0 million for the same periods last year. Our consolidated balance sheets also included the following amounts related to these services:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Accounts receivable, net	$	21,102	$	20,884
Contract assets	4,669		3,261
Contract liabilities	2,709		478

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Recent Accounting Pronouncements (Policies)

9 Months Ended

Jun. 27, 2021

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board ("FASB") issued updated guidance, Accounting Standards Update ("ASU") 2016-13, related to the measurement of credit losses for certain financial assets. This guidance replaces the current incurred loss methodology with an expected credit loss methodology. It requires us to recognize an allowance equal to our current estimate of all contractual cash flows that we do not expect to collect. We adopted this guidance in the first quarter of fiscal 2021, and the adoption did not have a material impact on our consolidated financial statements. Our estimate considered relevant information about past events, current conditions, and reasonable and supportable forecasts impacting the collectability of the reported amounts.

In August 2018, the FASB issued updated guidance modifying certain fair value measurement disclosures. The guidance contains additional disclosures to enable users of the financial statements to better understand the entity’s assumptions used to develop significant unobservable inputs for Level 3 fair value measurements, but also eliminates the requirement for entities to disclose the amount of and reasons for transfers between Level 1 and Level 2 investments within the fair value hierarchy. We adopted this guidance in the first quarter of fiscal 2021, and the adoption did not have a material impact on our consolidated financial statements.

In December 2019, the FASB issued guidance simplifying the accounting for income taxes by removing certain exceptions to general principles in Topic 740 and amending certain existing guidance for clarity. This guidance is effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2020 (first quarter of fiscal 2022 for us). Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In May 2020, the Securities and Exchange Commission issued guidance amending certain financial disclosures about acquired and disposed businesses. The amendments are designed to assist registrants in making more meaningful determinations of whether a subsidiary or an acquired or disposed business is significant, and to improve the related disclosure requirements. The guidance is effective for fiscal years beginning after December 31, 2020 (first quarter of fiscal 2022 for us). We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

Revenue and Contract Assets and Contract Liabilities

We invoice customers based on the contractual terms of each contract. However, the timing of revenue recognition may differ from the timing of invoice issuance.

Contract assets represent revenue recognized in excess of the amounts for which we have the contractual right to bill our customers. Such amounts are recoverable from customers based upon various measures of performance, including achievement of certain milestones or completion of a contract. In addition, many of our time and materials arrangements are billed in arrears pursuant to contract terms that are standard within the industry, resulting in contract assets and/or unbilled receivables being recorded, as revenue is recognized in advance of billings. Contract retentions, included in contract assets, represent amounts withheld by clients until certain conditions are met or the project is completed, which may extend beyond one year.

Contract liabilities consist of billings in excess of revenue recognized. Contract liabilities decrease as we recognize revenue from the satisfaction of the related performance obligation and increase as billings in advance of revenue recognition occur. Contract assets and liabilities are reported in a net position on a contract-by-contract basis at the end of each reporting period. There were no substantial non-current contract assets or liabilities for the periods presented.We recognize revenue primarily using the cost-to-cost measure of progress to estimate progress towards completion. Changes in those estimates could result in the recognition of cumulative catch-up adjustments to the contract’s inception-to-date revenue, costs and profit in the period in which such changes are made.Our RUPOs represent a measure of the total dollar value of work to be performed on contracts awarded and in progress. We had $3.2 billion of RUPOs as of June 27, 2021. RUPOs increase with awards from new contracts or additions on existing contracts and decrease as work is performed and revenue is recognized on existing contracts. RUPOs may also decrease when projects are canceled or modified in scope. We include a contract within our RUPOs when the contract is awarded and an agreement on contract terms has been reached.Although RUPOs reflect business that is considered to be firm, cancellations, deferrals or scope adjustments may occur. RUPOs are adjusted to reflect any known project cancellations, revisions to project scope and cost, foreign currency exchange fluctuations and project deferrals, as appropriate. Our operations and maintenance contracts can generally be terminated by the clients without a substantive financial penalty. Therefore, the remaining performance obligations on such contracts are limited to the notice period required for the termination (usually 30, 60, or 90 days).

Accounts Receivable, Net

Billed accounts receivable represent amounts billed to clients that have not been collected. Unbilled accounts receivable, which represent an unconditional right to payment subject only to the passage of time, include unbilled amounts typically resulting from revenue recognized but not yet billed pursuant to contract terms or billed after the period end date. Substantially all of our unbilled receivables at June 27, 2021 are expected to be billed and collected within 12 months. The allowance for doubtful accounts represents amounts that are expected to become uncollectible or unrealizable in the future. We determine an estimated allowance for uncollectible accounts based on management's consideration of trends in the actual and forecasted credit quality of our clients, including delinquency and payment history; type of client, such as a government agency or a commercial sector client; and general economic and industry conditions, including the potential impacts of the coronavirus disease 2019 ("COVID-19") pandemic, that may affect our clients' ability to pay. The $3.8 million decline in our allowance for doubtful accounts in the first nine months of fiscal 2021 primarily reflects the collection of accounts receivable we previously determined were likely uncollectible related to our Canadian turn-key pipeline activities that we decided to dispose of in the fourth quarter of fiscal 2019. Claims are amounts in excess of agreed contract prices that we seek to collect from our clients or other third parties for delays, errors in specifications and designs, contract terminations, change orders in dispute or unapproved as to both scope and price, or other causes of unanticipated additional costs. Factors considered in determining whether revenue associated with claims (including change orders in dispute and unapproved change orders in regards to both scope and price) should be recognized include the following: (a) the contract or other evidence provides a legal basis for the claim, (b) additional costs were caused by circumstances that were unforeseen at the contract date and not the result of deficiencies in our performance, (c) claim-related costs are identifiable and considered reasonable in view of the work performed, and (d) evidence supporting the claim is objective and verifiable. This can lead to a situation in which costs are recognized in one period and revenue is recognized in a subsequent period when a client agreement is obtained, or a claims resolution occurs.We regularly evaluate all unsettled claim amounts and record appropriate adjustments to revenue when it is probable that the claim will result in a different contract value than the amount previously estimated.

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Revenue and Contract Balances (Tables)

9 Months Ended

Jun. 27, 2021

Revenue from Contract with Customer [Abstract]

Summary of revenue disaggregated by client sector and contract type

The following tables present revenue disaggregated by client sector and contract type:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Client Sector:
U.S. state and local government	$	135,717	$	97,163	$	390,464	$	324,670
U.S. federal government (1)	265,999		243,414		799,560		731,977
U.S. commercial	153,100		168,491		454,607		510,770
International (2)	246,817		200,703		676,869		674,110
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Contract Type:
Fixed-price	$	294,568	$	275,810	$	841,118	$	802,477
Time-and-materials	379,705		309,123		1,082,143		1,047,900
Cost-plus	127,360		124,838		398,239		391,150
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527

(1)     Includes revenue generated under U.S. federal government contracts performed outside the United States.

(2) Includes revenue generated from foreign operations, primarily in Canada, Australia, the United Kingdom, and revenue generated from non-U.S. clients.

Summary of net contract assets/liabilities

Net contract assets/liabilities consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Contract assets (1)	$	91,405	$	92,632
Contract liabilities	(179,127)		(171,905)
Net contract liabilities	$	(87,722)	$	(79,273)

(1)     Includes $8.5 million and $12.3 million of contract retentions as of June 27, 2021 and September 27, 2020, respectively.

Components of net accounts receivable

Net accounts receivable consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Billed	$	431,613	$	402,818
Unbilled	236,174		253,364
Total accounts receivable	667,787		656,182
Allowance for doubtful accounts	(3,394)		(7,147)
Total accounts receivable, net	$	664,393	$	649,035

Remaining performance obligation, expected timing

We expect to satisfy our RUPOs as of June 27, 2021 over the following periods:

	Amount
	(in thousands)
Within 12 months	$	1,950,987
Beyond	1,280,146
Total	$	3,231,133

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Goodwill and Intangible Assets (Tables)

9 Months Ended

Jun. 27, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of changes in the carrying value of goodwill

The following table summarizes the changes in the carrying value of goodwill by reportable segment:

	GSG		CIG		Total
	(in thousands)
Balance at September 27, 2020	$	516,315	$	477,183	$	993,498
Acquisition activity	14,891		3,675		18,566
Translation	10,099		29,633		39,732
Balance at June 27, 2021	$	541,305	$	510,491	$	1,051,796

Summary of acquired identifiable intangible assets with finite useful lives

The following table presents the gross amount and accumulated amortization of our acquired identifiable intangible assets with finite useful lives included in “Intangible assets, net” on the consolidated balance sheets:

	June 27, 2021					September 27, 2020
	Weighted- Average Remaining Life (in Years)	Gross Amount		Accumulated Amortization		Gross Amount		Accumulated Amortization
	($ in thousands)
Client relations	2.5	$	48,444	$	(42,587)	$	60,775	$	(53,392)
Backlog	0.7	32,292		(30,027)		37,682		(32,761)
Trade names	1.6	7,162		(6,124)		7,964		(6,325)
Total		$	87,898	$	(78,738)	$	106,421	$	(92,478)

Estimated amortization expense for the remainder of the fiscal year and the succeeding years

Estimated amortization expense for the remainder of fiscal 2021 and succeeding years is as follows:

	Amount
	(in thousands)
2021	$	2,093
2022	4,072
2023	2,138
2024	754
2025	103
Total	$	9,160

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Property and Equipment (Tables)

9 Months Ended

Jun. 27, 2021

Property, Plant and Equipment [Abstract]

Schedule of components of property and equipment

Property and equipment consisted of the following:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Equipment, furniture and fixtures	$	98,289	$	90,942
Leasehold improvements	36,280		34,569
Total property and equipment	134,569		125,511
Accumulated depreciation	(98,568)		(90,004)
Property and equipment, net	$	36,001	$	35,507

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Stock Repurchase and Dividends (Tables)

9 Months Ended

Jun. 27, 2021

Stock Repurchase And Dividends [Abstract]

Summary of dividends declared and paid

The following table presents dividends declared and paid in the first nine months of fiscal 2021 and 2020:

Declare Date	Dividend Paid Per Share		Record Date	Payment Date	Dividend Paid (in thousands)
November 9, 2020	$	0.17	November 30, 2020	December 11, 2020	$	9,198
January 25, 2021	$	0.17	February 10, 2021	February 26, 2021	9,212
April 26, 2021	$	0.20	May 12, 2021	May 28, 2021	10,831
Total dividend paid as of June 27, 2021					$	29,241
November 11, 2019	$	0.15	December 2, 2019	December 13, 2019	$	8,190
January 27, 2020	$	0.15	February 12, 2020	February 28, 2020	8,225
April 27, 2020	$	0.17	May 13, 2020	May 29, 2020	9,175
Total dividend paid as of June 28, 2020					$	25,590

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Leases (Tables)

9 Months Ended

Jun. 27, 2021

Leases [Abstract]

Summary of components of lease cost

The components of lease costs are as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating lease cost	$	22,423	$	21,152	$	67,132	$	63,919
Sublease income	(21)		(573)		(81)		(1,688)
Other	—		18		—		54
Total lease cost	$	22,402	$	20,597	$	67,051	$	62,285

Supplemental cash flow information related to leases is as follows:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Operating cash flows for operating leases	$	20,217	$	18,634	$	56,616	$	60,138
Right-of-use assets obtained in exchange for new operating lease liabilities	$	9,672	$	7,505	$	43,394	$	305,141

Summary of supplemental balance sheet and other information

Supplemental balance sheet and other information related to leases are as follows:

	Balance at
	June 27, 2021			September 27, 2020
	(in thousands)
Operating leases:
Right-of-use assets	$	213,236		$	239,396
Lease liabilities:
Current	64,911			69,650
Long-term	173,080			191,955
Total operating lease liabilities	$	237,991		$	261,605
Weighted-average remaining lease term:
Operating leases	5 years			5 years
Weighted-average discount rate:
Operating leases	2.3		%	2.5		%

Summary of maturity of future undiscounted cash flows associated with operating lease liabilities

A maturity analysis of the future undiscounted cash flows associated with our operating lease liabilities is as follows:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
2021	$	18,813	$	75,074
2022	70,378		64,972
2023	49,755		44,733
2024	36,221		30,991
2025	26,810		21,466
Beyond	52,411		44,169
Total lease payments	254,388		281,405
Less: imputed interest	(16,397)		(19,800)
Total present value of lease liabilities	$	237,991	$	261,605

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Earnings per Share ("EPS") (Tables)

9 Months Ended

Jun. 27, 2021

Earnings Per Share [Abstract]

Schedule of number of weighted-average shares used to compute basic and diluted EPS

The following table presents the number of weighted-average shares used to compute basic and diluted EPS:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	51,903	$	45,497	$	149,856	$	129,205
Weighted-average common shares outstanding – basic	54,117		53,985		54,095		54,366
Effect of dilutive stock options and unvested restricted stock	549		707		603		795
Weighted-average common shares outstanding – diluted	54,666		54,692		54,698		55,161
Earnings per share attributable to Tetra Tech:
Basic	$	0.96	$	0.84	$	2.77	$	2.38
Diluted	$	0.95	$	0.83	$	2.74	$	2.34

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Reportable Segments (Tables)

9 Months Ended

Jun. 27, 2021

Segment Reporting [Abstract]

Summarized financial information of reportable segments

The following tables summarize financial information regarding our reportable segments:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands)
Revenue
GSG	$	488,700	$	432,180	$	1,431,151	$	1,326,487
CIG	327,434		291,021		931,586		950,597
RCM	143		48		613		198
Elimination of inter-segment revenue	(14,644)		(13,478)		(41,850)		(35,755)
Total	$	801,633	$	709,771	$	2,321,500	$	2,241,527
Income from operations
GSG	$	49,297	$	43,100	$	143,106	$	120,495
CIG	34,017		28,848		89,886		82,156
RCM	—		(1)		1		—
Corporate (1)	(13,507)		(8,422)		(36,128)		(28,295)
Total	$	69,807	$	63,525	$	196,865	$	174,356

(1) Includes amortization of intangibles, other costs and other income not allocable to our reportable segments.

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Total Assets
GSG	$	642,830	$	649,417
CIG	470,009		479,238
RCM	11,760		14,258
Corporate (1)	1,386,322		1,235,645
Total	$	2,510,921	$	2,378,558

(1) Corporate assets consist of intercompany eliminations and assets not allocated to our reportable segments including goodwill, intangible assets, deferred income taxes and certain other assets.

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Reclassifications Out of Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Jun. 27, 2021

Equity [Abstract]

Summary of reclassifications out of accumulated other comprehensive income

The accumulated balances and activities for the three and nine months ended June 27, 2021 and June 28, 2020 related to reclassifications out of accumulated other comprehensive income are summarized as follows:

	Three Months Ended
	Foreign Currency Translation Adjustments		Gain (Loss) on Derivative Instruments		Accumulated Other Comprehensive Income (Loss)
	(in thousands)
Balance at March 29, 2020	$	(182,822)	$	(16,569)	$	(199,391)
Other comprehensive income before reclassifications	21,689		1,279		22,968
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(1,309)		(1,309)
Net current-period other comprehensive income (loss)	21,689		(30)		21,659
Balance at June 28, 2020	$	(161,133)	$	(16,599)	$	(177,732)
Balance at March 28, 2021	$	(102,911)	$	(12,145)	$	(115,056)
Other comprehensive income before reclassifications	11,157		2,981		14,138
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(1,483)		(1,483)
Net current-period other comprehensive income	11,157		1,498		12,655
Balance at June 27, 2021	$	(91,754)	$	(10,647)	$	(102,401)
	Nine Months Ended
	Foreign Currency Translation Adjustments		Gain (Loss) on Derivative Instruments		Accumulated Other Comprehensive Income (Loss)
	(in thousands)
Balance at September 29, 2019	$	(149,711)	$	(10,873)	$	(160,584)
Other comprehensive loss before reclassifications	(11,422)		(3,200)		(14,622)
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(2,526)		(2,526)
Net current-period other comprehensive loss	(11,422)		(5,726)		(17,148)
Balance at June 28, 2020	$	(161,133)	$	(16,599)	$	(177,732)
Balance at September 27, 2020	$	(146,275)	$	(15,511)	$	(161,786)
Other comprehensive income before reclassifications	54,521		9,341		63,862
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax (1)	—		(4,477)		(4,477)
Net current-period other comprehensive income	54,521		4,864		59,385
Balance at June 27, 2021	$	(91,754)	$	(10,647)	$	(102,401)
(1) This accumulated other comprehensive component is reclassified to “Interest expense” in our consolidated statements of income. See Note 14, “Derivative Financial Instruments”, for more information.

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Related Party Transactions (Tables)

9 Months Ended

Jun. 27, 2021

Related Party Transactions [Abstract]

Schedule of related party transactions

Our consolidated balance sheets also included the following amounts related to these services:

	Balance at
	June 27, 2021		September 27, 2020
	(in thousands)
Accounts receivable, net	$	21,102	$	20,884
Contract assets	4,669		3,261
Contract liabilities	2,709		478

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Revenue and Contract Balances - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 801,633	$ 709,771	$ 2,321,500	$ 2,241,527
Fixed-price
Disaggregation of Revenue [Line Items]
Revenue	294,568	275,810	841,118	802,477
Time-and-materials
Disaggregation of Revenue [Line Items]
Revenue	379,705	309,123	1,082,143	1,047,900
Cost-plus
Disaggregation of Revenue [Line Items]
Revenue	127,360	124,838	398,239	391,150
U.S. state and local government
Disaggregation of Revenue [Line Items]
Revenue	135,717	97,163	390,464	324,670
U.S. federal government
Disaggregation of Revenue [Line Items]
Revenue	265,999	243,414	799,560	731,977
U.S. commercial
Disaggregation of Revenue [Line Items]
Revenue	153,100	168,491	454,607	510,770
International
Disaggregation of Revenue [Line Items]
Revenue	$ 246,817	$ 200,703	$ 676,869	$ 674,110

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Revenue and Contract Balances - Summary of Contract Liabilities/Assets (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Sep. 27, 2020
Revenue from Contract with Customer [Abstract]
Contract assets	$ 91,405	$ 92,632
Contract liabilities	(179,127)	(171,905)
Net contract liabilities	(87,722)	(79,273)
Disaggregation of Revenue [Line Items]
Contract assets	91,405	92,632
Contract Retentions
Revenue from Contract with Customer [Abstract]
Contract assets	8,500	12,300
Disaggregation of Revenue [Line Items]
Contract assets	$ 8,500	$ 12,300

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Revenue and Contract Balances - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Mar. 29, 2020	Jun. 27, 2021	Jun. 28, 2020	Sep. 27, 2020
Disaggregation of Revenue [Line Items]
Contract liability revenue recognized during the period			$ 108,000	$ 106,000
Net favorable (unfavorable) operating income adjustments	$ 1,700	$ (2,800)	2,800	(2,800)
Liabilities for anticipated losses	8,000		8,000		$ 13,200
Estimated cost to complete the related contracts	81,000		$ 81,000		118,000
Period for billing and collecting unbilled receivables			12 months
Decline in allowance for doubtful accounts			$ 3,800
Unbilled accounts receivable related to claims and requests for equitable adjustment on contracts	11,000		11,000		$ 11,000
Remaining unsatisfied performance obligation	$ 3,231,133		$ 3,231,133
Remaining performance obligation, termination notice period one			30 days
Remaining performance obligation, termination notice period two			60 days
Remaining performance obligation, termination notice period three			90 days
CIG
Disaggregation of Revenue [Line Items]
Gains (losses) due to change in contract value			$ 2,800	$ (4,400)

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Revenue and Contract Balances - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Sep. 27, 2020
Revenue from Contract with Customer [Abstract]
Billed	$ 431,613	$ 402,818
Unbilled	236,174	253,364
Total accounts receivable	667,787	656,182
Allowance for doubtful accounts	(3,394)	(7,147)
Total accounts receivable, net	$ 664,393	$ 649,035

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Revenue and Contract Balances - Remaining Unsatisfied Performance Obligations (Details) $ in Thousands	Jun. 27, 2021 USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining unsatisfied performance obligation	$ 3,231,133
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-06-28
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining unsatisfied performance obligation	$ 1,950,987
Remaining unsatisfied performance obligation, expected timing of satisfaction	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-07-04
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining unsatisfied performance obligation	$ 1,280,146
Remaining unsatisfied performance obligation, expected timing of satisfaction

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Acquisitions - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 27, 2021 USD ($) acquisition	Sep. 27, 2020 USD ($) acquisition	Jun. 28, 2020 USD ($)	Jul. 26, 2021 employee
Business Acquisition [Line Items]
Contingent earn-out liability	$ 31,200		$ 31,200
Gain on fair value adjustment to contingent consideration	(30)	$ (50)	$ 163		$ 1,521
Minimum
Business Acquisition [Line Items]
Significant unobservable input, earn-out period			2 years
Minimum | Existing customer contracts
Business Acquisition [Line Items]
Useful life of intangible assets			1 year
Minimum | Trade names
Business Acquisition [Line Items]
Useful life of intangible assets			3 years
Maximum
Business Acquisition [Line Items]
Significant unobservable input, earn-out period			3 years
Maximum | Existing customer contracts
Business Acquisition [Line Items]
Useful life of intangible assets			10 years
Maximum | Trade names
Business Acquisition [Line Items]
Useful life of intangible assets			5 years
Series of individually immaterial business acquisitions
Business Acquisition [Line Items]
Number of acquisitions | acquisition			3
Fair value of acquisition purchase price			$ 29,100
Initial cash payments			18,900
Contingent earn-out liability	10,200		10,200
Aggregate maximum of contingent consideration	19,000		$ 19,000
Series of individually immaterial business acquisitions | Minimum
Business Acquisition [Line Items]
Earn-out period			3 years
Series of individually immaterial business acquisitions | Maximum
Business Acquisition [Line Items]
Earn-out period			4 years
SEG and BWF
Business Acquisition [Line Items]
Number of acquisitions | acquisition				2
Fair value of acquisition purchase price				$ 88,600
Initial cash payments				71,400
Contingent earn-out liability				16,500
Aggregate maximum of contingent consideration				$ 28,000
Earn-out period				3 years
Payables related to estimated post-closing adjustments				$ 700
All acquisitions
Business Acquisition [Line Items]
Aggregate maximum of contingent consideration	$ 68,200		$ 68,200
Hoare Lea | Subsequent Event
Business Acquisition [Line Items]
Number of employees (more than) | employee						900

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Goodwill and Intangible Assets - Goodwill (Details) $ in Thousands	9 Months Ended
	Jun. 27, 2021 USD ($)
Goodwill
Balance at beginning of the period	$ 993,498
Acquisition activity	18,566
Translation	39,732
Balance at end of the period	1,051,796
GSG
Goodwill
Balance at beginning of the period	516,315
Acquisition activity	14,891
Translation	10,099
Balance at end of the period	541,305
CIG
Goodwill
Balance at beginning of the period	477,183
Acquisition activity	3,675
Translation	29,633
Balance at end of the period	$ 510,491

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Goodwill and Intangible Assets - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 27, 2020	Jun. 27, 2021	Jun. 30, 2020	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020	Sep. 27, 2020	Jun. 29, 2020
Goodwill [Line Items]
Impairment of goodwill							$ 0
Carrying value	$ 2,378,558,000	$ 2,510,921,000			$ 2,510,921,000		2,378,558,000
Goodwill	993,498,000	1,051,796,000			1,051,796,000		993,498,000
Amortization expense		2,200,000		$ 2,600,000	7,800,000	$ 9,000,000.0
Australia
Goodwill [Line Items]
Percentage negative growth			7.00%
All reporting units excluding ASP
Goodwill [Line Items]
Percentage of excess of fair value over carrying value								80.00%
ASP
Goodwill [Line Items]
Impairment of goodwill	15,800,000
Carrying value	144,900,000						144,900,000
Goodwill	95,500,000						95,500,000
GSG
Goodwill [Line Items]
Gross amounts of goodwill	534,000,000.0	559,000,000.0			559,000,000.0		534,000,000.0
Accumulated impairment	17,700,000	17,700,000			17,700,000		17,700,000
Goodwill	516,315,000	541,305,000			541,305,000		516,315,000
CIG
Goodwill [Line Items]
Gross amounts of goodwill	598,700,000	632,000,000.0			632,000,000.0		598,700,000
Accumulated impairment	121,500,000	121,500,000			121,500,000		121,500,000
Goodwill	$ 477,183,000	$ 510,491,000			$ 510,491,000		$ 477,183,000
CIG | ASP
Goodwill [Line Items]
Percentage of excess of fair value over carrying value								20.00%

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Goodwill and Intangible Assets - Gross Amount, Accumulated Amortization and Estimated Amortization (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 27, 2021	Sep. 27, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Amount	$ 87,898	$ 106,421
Accumulated Amortization	(78,738)	(92,478)
Estimated amortization expense
2021	2,093
2022	4,072
2023	2,138
2024	754
2025	103
Total	$ 9,160	13,943
Client relations
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Life (in Years)	2 years 6 months
Gross Amount	$ 48,444	60,775
Accumulated Amortization	$ (42,587)	(53,392)
Backlog
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Life (in Years)	8 months 12 days
Gross Amount	$ 32,292	37,682
Accumulated Amortization	$ (30,027)	(32,761)
Trade names
Finite-Lived Intangible Assets [Line Items]
Weighted- Average Remaining Life (in Years)	1 year 7 months 6 days
Gross Amount	$ 7,162	7,964
Accumulated Amortization	$ (6,124)	$ (6,325)

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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020	Sep. 27, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 134,569		$ 134,569		$ 125,511
Accumulated depreciation	(98,568)		(98,568)		(90,004)
Property and equipment, net	36,001		36,001		35,507
Depreciation expense related to property and equipment	3,100	$ 3,700	9,000	$ 10,100
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	98,289		98,289		90,942
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 36,280		$ 36,280		$ 34,569

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Stock Repurchase and Dividends - Narrative (Details) - USD ($)									3 Months Ended		9 Months Ended
	Sep. 03, 2021	Jul. 26, 2021	May 28, 2021	Feb. 26, 2021	Dec. 11, 2020	May 29, 2020	Feb. 28, 2020	Dec. 13, 2019	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020	Sep. 27, 2020	Jan. 27, 2020
Stock Repurchase And Dividends [Abstract]
Maximum repurchase amount under stock repurchase program														$ 200,000,000
Remaining authorized amount under share repurchase program									$ 162,800,000		$ 162,800,000		$ 207,800,000
Shares repurchased (in shares)											368,177
Average price (in dollars per share)											$ 122.22
Total cost											$ 45,000,000.0
Subsequent Event [Line Items]
Dividend paid per share (in dollars per share)			$ 0.20	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.20	$ 0.17	$ 0.54	$ 0.47
Subsequent Event
Subsequent Event [Line Items]
Quarterly cash dividend declared (in dollars per share)		$ 0.20
Forecast | Subsequent Event
Subsequent Event [Line Items]
Dividend paid per share (in dollars per share)	$ 0.20

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Stock Repurchase and Dividends - Schedule of Dividends Declared and Paid (Details) - USD ($) $ / shares in Units, $ in Thousands							3 Months Ended		9 Months Ended
	May 28, 2021	Feb. 26, 2021	Dec. 11, 2020	May 29, 2020	Feb. 28, 2020	Dec. 13, 2019	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Stock Repurchase And Dividends [Abstract]
Dividend paid per share (in dollars per share)	$ 0.20	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.20	$ 0.17	$ 0.54	$ 0.47
Dividend Paid	$ 10,831	$ 9,212	$ 9,198	$ 9,175	$ 8,225	$ 8,190			$ 29,241	$ 25,590

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Leases - Narrative (Details)	Jun. 27, 2021
Lessee, Lease, Description [Line Items]
Renewal term (up to)	5 years
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 month
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	12 years

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Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Leases [Abstract]
Operating lease cost	$ 22,423	$ 21,152	$ 67,132	$ 63,919
Sublease income	(21)	(573)	(81)	(1,688)
Other	0	18	0	54
Total lease cost	$ 22,402	$ 20,597	$ 67,051	$ 62,285

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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Leases [Abstract]
Operating cash flows for operating leases	$ 20,217	$ 18,634	$ 56,616	$ 60,138
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 9,672	$ 7,505	$ 43,394	$ 305,141

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Leases - Supplemental Balance Sheet and Other Information (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Sep. 27, 2020
Operating leases:
Right-of-use assets	$ 213,236	$ 239,396
Lease liabilities:
Current	64,911	69,650
Long-term	173,080	191,955
Total operating lease liabilities	$ 237,991	$ 261,605
Weighted-average remaining lease term:
Operating leases	5 years	5 years
Weighted-average discount rate:
Operating leases	2.30%	2.50%

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Leases - Maturity Analysis of the Future Undiscounted Cash Flows of Operating and Finance Lease Liabilities (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Sep. 27, 2020
Leases [Abstract]
2021	$ 18,813
2022/2021	70,378	$ 75,074
2023/2022	49,755	64,972
2024/2023	36,221	44,733
2025/2024	26,810	30,991
2025		21,466
Beyond	52,411
Beyond		44,169
Total lease payments	254,388	281,405
Less: imputed interest	(16,397)	(19,800)
Total present value of lease liabilities	$ 237,991	$ 261,605

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Stockholders' Equity and Stock Compensation Plans (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 5.7	$ 4.1	$ 16.3	$ 13.5
Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares that ultimately vest depending on growth in diluted earnings per share			50.00%
Percentage of shares that ultimately vest depending on the shareholder return relative to peer group of companies over vesting period			50.00%
Performance-based restricted stock | Non-employee directors and executive officers
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			57,542
Fair value of awards granted (in dollars per share)			$ 153.03
Vesting period			3 years
Restricted stock units | Non-employee directors, executive officers and employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted (in shares)			117,084
Fair value of awards granted (in dollars per share)			$ 121.97
Restricted stock units | Executive officers and employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Restricted stock units | Non-employee director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year

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Earnings per Share ("EPS") - Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Earnings Per Share [Abstract]
Net income attributable to Tetra Tech	$ 51,903	$ 45,497	$ 149,856	$ 129,205
Weighted-average common shares outstanding – basic (in shares)	54,117	53,985	54,095	54,366
Effect of dilutive stock options and unvested restricted stock (in shares)	549	707	603	795
Weighted-average common stock outstanding – diluted (in shares)	54,666	54,692	54,698	55,161
Earnings per share attributable to Tetra Tech:
Basic (in dollars per share)	$ 0.96	$ 0.84	$ 2.77	$ 2.38
Diluted (in dollars per share)	$ 0.95	$ 0.83	$ 2.74	$ 2.34

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Income Taxes - Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Sep. 27, 2020
Income Tax Disclosure [Abstract]
Effective tax rate	20.40%	21.20%
Reduction in income tax expense due to excess tax benefits on share-based payments	$ 8.7	$ 7.0
Effective tax rate, excluding excess tax benefits on share-based payments	25.00%	25.40%
Liability for uncertain tax positions	$ 12.8		$ 9.7

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Reportable Segments - Financial Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 27, 2021 USD ($) segment	Jun. 28, 2020 USD ($)	Sep. 27, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
Revenue	$ 801,633	$ 709,771	$ 2,321,500	$ 2,241,527
Income from operations	69,807	63,525	196,865	174,356
Total Assets	2,510,921		2,510,921		$ 2,378,558
Operating segments | GSG
Segment Reporting Information [Line Items]
Revenue	488,700	432,180	1,431,151	1,326,487
Income from operations	49,297	43,100	143,106	120,495
Total Assets	642,830		642,830		649,417
Operating segments | CIG
Segment Reporting Information [Line Items]
Revenue	327,434	291,021	931,586	950,597
Income from operations	34,017	28,848	89,886	82,156
Total Assets	470,009		470,009		479,238
Operating segments | RCM
Segment Reporting Information [Line Items]
Revenue	143	48	613	198
Income from operations	0	(1)	1	0
Total Assets	11,760		11,760		14,258
Elimination of inter-segment revenue
Segment Reporting Information [Line Items]
Revenue	(14,644)	(13,478)	(41,850)	(35,755)
Corporate
Segment Reporting Information [Line Items]
Income from operations	(13,507)	$ (8,422)	(36,128)	$ (28,295)
Total Assets	$ 1,386,322		$ 1,386,322		$ 1,235,645

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Fair Value Measurements (Details) $ in Millions	Jun. 27, 2021 USD ($)
Amended Credit Agreement
Debt Instrument [Line Items]
Amount outstanding under credit facility	$ 246.5

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Derivative Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 27, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 27, 2021 USD ($)	Jun. 28, 2020 USD ($)	Sep. 30, 2018 agreement	Sep. 27, 2020 USD ($)
Derivative [Line Items]
Gains (losses) on cash flow hedges recognized in comprehensive income	$ 1,498	$ (30)	$ 4,864	$ (5,726)
Interest Rate Swap | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Number of derivative agreements | agreement					5
Notional amount	$ 218,800		$ 218,800
Fixed rate	2.79%		2.79%
Loss to be reclassified during next twelve months	$ 5,700		$ 5,700
Interest Rate Swap | Designated as cash flow hedges | Derivatives designated as hedging instruments | Other current liabilities
Derivative [Line Items]
Fair value of interest rate swap agreements	(10,600)		(10,600)			$ (15,500)
Interest Rate Swap 1 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	43,800		43,800
Interest Rate Swap 2 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	43,800		43,800
Interest Rate Swap 3 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	43,800		43,800
Interest Rate Swap 4 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	43,800		43,800
Interest Rate Swap 5 | Designated as cash flow hedges | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 43,800		$ 43,800

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Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Reclassifications out of accumulated other comprehensive loss
Beginning balance	$ 1,147,228	$ 950,238	$ 1,037,373	$ 989,464
Amounts reclassified from accumulated other comprehensive loss
Other comprehensive income (loss), net of tax	12,657	21,655	59,391	(17,154)
Ending balance	1,192,495	993,026	1,192,495	993,026
Accumulated Other Comprehensive Income (Loss)
Reclassifications out of accumulated other comprehensive loss
Beginning balance	(115,056)	(199,391)	(161,786)	(160,584)
Other comprehensive income (loss) before reclassifications	14,138	22,968	63,862	(14,622)
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax	(1,483)	(1,309)	(4,477)	(2,526)
Other comprehensive income (loss), net of tax	12,655	21,659	59,385	(17,148)
Ending balance	(102,401)	(177,732)	(102,401)	(177,732)
Foreign Currency Translation Adjustments
Reclassifications out of accumulated other comprehensive loss
Beginning balance	(102,911)	(182,822)	(146,275)	(149,711)
Other comprehensive income (loss) before reclassifications	11,157	21,689	54,521	(11,422)
Amounts reclassified from accumulated other comprehensive loss
Other comprehensive income (loss), net of tax	11,157	21,689	54,521	(11,422)
Ending balance	(91,754)	(161,133)	(91,754)	(161,133)
Gain (Loss) on Derivative Instruments
Reclassifications out of accumulated other comprehensive loss
Beginning balance				(10,873)
Gain (Loss) on Derivative Instruments
Reclassifications out of accumulated other comprehensive loss
Beginning balance	(12,145)	(16,569)	(15,511)
Other comprehensive income (loss) before reclassifications	2,981	1,279	9,341	(3,200)
Amounts reclassified from accumulated other comprehensive loss
Interest rate contracts, net of tax	(1,483)	(1,309)	(4,477)	(2,526)
Other comprehensive income (loss), net of tax	1,498	(30)	4,864	(5,726)
Ending balance	$ (10,647)	$ (16,599)	$ (10,647)	$ (16,599)

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Commitments and Contingencies (Details)	Jul. 15, 2019 action
Commitments and Contingencies Disclosure [Abstract]
Number of qui tam actions	3

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Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020	Sep. 27, 2020
Related Party Transactions [Abstract]
Related party revenues	$ 24,200	$ 19,000	$ 69,800	$ 67,000
Related party expenses	23,200	$ 18,400	67,200	$ 66,000
Accounts receivable, net	21,102		21,102		$ 20,884
Contract assets	4,669		4,669		3,261
Contract liabilities	$ 2,709		$ 2,709		$ 478