10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

ý Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended December 28, 2013

or

¨ Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Commission File Number 001-14423

PLEXUS CORP.

(Exact name of registrant as specified in charter)

Wisconsin	39-1344447
(State of Incorporation)	(IRS Employer Identification No.)

One Plexus Way

Neenah, Wisconsin 54956

(Address of principal executive offices)(Zip Code)

Telephone Number (920) 969-6000

(Registrant’s telephone number, including Area Code)

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  ý    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  ý    No  ¨

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

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

As of January 27, 2014, there were 33,934,291 shares of Common Stock of the Company outstanding.

PLEXUS CORP.

TABLE OF CONTENTS

December 28, 2013

PART I. FINANCIAL INFORMATION	3
ITEM 1. FINANCIAL STATEMENTS	3
Condensed Consolidated Statements of Comprehensive Income	3
Condensed Consolidated Balance Sheets	4
Condensed Consolidated Statements of Cash Flows	5
Notes to Condensed Consolidated Financial Statements	6
ITEM  2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	14
“Safe Harbor” Cautionary Statement	14
Overview	15
Results of Operations	15
Reportable Segments	18
Liquidity and Capital Resources	18
Contractual Obligations, Commitments and Off-Balance Sheet Obligations	21
Disclosure About Critical Accounting Policies	22
New Accounting Pronouncements	22
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	23
ITEM 4. CONTROLS AND PROCEDURES	24
PART II. OTHER INFORMATION	25
ITEM 1A. Risk Factors	25
ITEM 2. Unregistered Sales of Equity Securities and Use Of Proceeds	25
ITEM 6. Exhibits	26
SIGNATURES	27

2

PART I.     FINANCIAL INFORMATION

ITEM 1.    FINANCIAL STATEMENTS

PLEXUS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands, except per share data)

Unaudited

	Three Months Ended
	December 28, 2013			December 29, 2012
Net sales	$	533,905		$	530,532
Cost of sales	482,403			479,370
Gross profit	51,502			51,162
Selling and administrative expenses	26,136			29,678
Restructuring charges	3,605			—
Operating income	21,761			21,484
Other income (expense):
Interest expense	(2,815		)	(3,720		)
Interest income	639			397
Miscellaneous	240			(475		)
Income before income taxes	19,825			17,686
Income tax expense	2,162			1,070
Net income	$	17,663		$	16,616
Earnings per share:
Basic	$	0.52		$	0.48
Diluted	$	0.51		$	0.47
Weighted average shares outstanding:
Basic	33,730			34,836
Diluted	34,693			35,283
Comprehensive income:
Net income	$	17,663		$	16,616
Other comprehensive income (loss):
Derivative instrument fair market value adjustment—net of income tax	(523		)	(511		)
Foreign currency translation adjustments	2,421			2,625
Other comprehensive income	1,898			2,114
Total comprehensive income	$	19,561		$	18,730

See notes to condensed consolidated financial statements.

3

PLEXUS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except per share data)

Unaudited

	December 28, 2013			September 28, 2013
ASSETS
Current assets:
Cash and cash equivalents	$	324,156		$	341,865
Accounts receivable, net of allowances of $1,204 and $1,008, respectively	300,275			305,350
Inventories	440,482			404,020
Deferred income taxes	3,933			3,917
Prepaid expenses and other	24,164			23,870
Total current assets	1,093,010			1,079,022
Property, plant and equipment, net	333,985			325,061
Deferred income taxes	2,482			2,510
Other	43,937			41,091
Total assets	$	1,473,414		$	1,447,684
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt and capital lease obligations	$	3,796		$	3,574
Accounts payable	337,300			313,404
Customer deposits	45,496			69,295
Accrued liabilities:
Salaries and wages	37,759			42,553
Other	50,630			42,550
Total current liabilities	474,981			471,376
Long-term debt and capital lease obligations, net of current portion	256,949			257,773
Deferred income taxes	2,128			2,128
Other liabilities	17,335			17,106
Total non-current liabilities	276,412			277,007
Total liabilities	751,393			748,383
Commitments and contingencies
Shareholders’ equity:
Preferred stock, $.01 par value, 5,000 shares authorized, none issued or outstanding	—			—
Common stock, $.01 par value, 200,000 shares authorized, 49,549 and 49,176 shares issued, respectively, and 33,787 and 33,600 shares outstanding, respectively	495			492
Additional paid-in capital	459,458			449,368
Common stock held in treasury, at cost, 15,762 and 15,576 shares, respectively	(456,902		)	(449,968		)
Retained earnings	696,835			679,172
Accumulated other comprehensive income	22,135			20,237
Total shareholders’ equity	722,021			699,301
Total liabilities and shareholders’ equity	$	1,473,414		$	1,447,684

See notes to condensed consolidated financial statements.

4

PLEXUS CORP. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

Unaudited

	Three Months Ended
	December 28, 2013			December 29, 2012
Cash flows from operating activities
Net income	$	17,663		$	16,616
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation	11,470			11,957
Amortization of intangibles	516			516
Gain on sale of property, plant and equipment	(72		)	(69		)
Deferred income taxes	(7		)	66
Stock based compensation expense	2,558			2,785
Changes in operating assets and liabilities:
Accounts receivable	5,891			33,365
Inventories	(35,587		)	(22,814		)
Prepaid expenses and other	(3,547		)	(3,047		)
Accounts payable	29,273			(22,478		)
Customer deposits	(23,960		)	(48		)
Accrued liabilities and other	(527		)	(8,342		)
Cash flows provided by operating activities	3,671			8,507
Cash flows from investing activities
Payments for property, plant and equipment	(21,795		)	(25,843		)
Proceeds from sales of property, plant and equipment	113			82
Cash flows used in investing activities	(21,682		)	(25,761		)
Cash flows from financing activities
Proceeds from revolving credit facility	45,000			—
Payments on revolving credit facility, debt and capital lease obligations	(46,016		)	(648		)
Repurchases of common stock	(6,934		)	(6,070		)
Proceeds from exercise of stock options	7,535			48
Cash flows used in financing activities	(415		)	(6,670		)
Effect of exchange rate changes on cash and cash equivalents	717			488
Net decrease in cash and cash equivalents	(17,709		)	(23,436		)
Cash and cash equivalents:
Beginning of period	341,865			297,619
End of period	$	324,156		$	274,183

See notes to condensed consolidated financial statements.

5

PLEXUS CORP. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

FOR THE THREE MONTHS ENDEDDECEMBER 28, 2013 AND DECEMBER 29, 2012

Unaudited

NOTE 1—BASIS OF PRESENTATION AND ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements included herein have been prepared by Plexus Corp. and its subsidiaries (together “Plexus” or the “Company”) without audit and pursuant to the rules and regulations of the United States (“U.S.”) Securities and Exchange Commission (“SEC”). In the opinion of the Company, the accompanying condensed consolidated financial statements reflect all adjustments, which include normal recurring adjustments necessary for the fair statement of the consolidated financial position of the Company as of December 28, 2013 and September 28, 2013, and the results of operations for the three months endedDecember 28, 2013 and December 29, 2012, and the cash flows for the same three month periods.

Certain information and footnote disclosures, normally included in financial statements prepared in accordance with generally accepted accounting principles, have been condensed or omitted pursuant to the SEC’s rules and regulations dealing with interim financial statements. However, the Company believes that the disclosures made in the condensed consolidated financial statements included herein are adequate to make the information presented not misleading. It is suggested that these condensed consolidated financial statements be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2013 Annual Report on Form 10-K.

The Company’s reportable segments consist of the “Americas” (“AMER”) segment, “Asia-Pacific” (“APAC”) segment and “Europe, Middle East, and Africa” (“EMEA”) segment. Refer to Note 9, "Business Segments," for further details on reportable segments.

Cash and Cash Equivalents

Cash and cash equivalents include highly liquid investments with original maturities of three months or less at the time of purchase and are classified as Level 1 in the fair level hierarchy described below.

Fair Value of Financial Instruments

The Company holds financial instruments consisting of cash and cash equivalents, accounts receivable, accounts payable, debt, derivatives, and capital lease obligations. The carrying values of cash and cash equivalents, accounts receivable, accounts payable, derivatives, and capital lease obligations as reported in the condensed consolidated financial statements approximate fair value. Accounts receivable were reflected at net realizable value based on anticipated losses due to potentially uncollectible balances. Anticipated losses were based on management’s analysis of historical losses and changes in customers’ credit status. The fair value of the Company’s long-term debt was $247.2 million and $246.8 million as of December 28, 2013 and September 28, 2013, respectively. The carrying value of the Company’s long-term debt was $250.0 million for both the periods ended December 28, 2013 and September 28, 2013. The Company uses quoted market prices when available or discounted cash flows to calculate the fair value of its debt. If measured at fair value in the financial statements, long-term debt (including the current portion) would be classified as Level 2 in the fair value hierarchy described below. Refer to Note 5, "Derivatives and Fair Value Measurements," for further details on derivatives.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (or exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting guidance establishes a fair value hierarchy based on three levels of inputs that may be used to measure fair value. The input levels are:

Level 1: Quoted (observable) market prices in active markets for identical assets or liabilities.

Level 2: Inputs other than Level 1 that are observable, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.

Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the asset or liability.

NOTE 2—INVENTORIES

6

Inventories are stated at the lower of cost (on a first-in, first-out basis) or market value. The stated cost is comprised of direct materials, labor, and overhead. The major classes of inventories, net of applicable lower of cost or market write-downs, were as follows (in thousands):

	December 28, 2013		September 28, 2013
Raw materials	$	310,643	$	288,559
Work-in-process	63,494		57,883
Finished goods	66,345		57,578
	$	440,482	$	404,020

Per contractual terms, customer deposits are received by the Company to offset obsolete and excess inventory risks. The total amount of customer deposits related to inventory and included within current liabilities on the accompanying Condensed Consolidated Balance Sheets as of December 28, 2013 and September 28, 2013 was $42.0 million and $51.6 million, respectively. The decrease in the customer deposits balance is primarily related to the return of $11.0 million of inventory related deposits to Juniper Networks, Inc. ("Juniper") in the first fiscal quarter of 2014.

NOTE 3—PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following categories (in thousands):

	December 28, 2013		September 28, 2013
Land, buildings and improvements	$	267,611	$	212,195
Machinery and equipment	315,223		312,941
Computer hardware and software	93,567		91,565
Construction in progress	27,183		67,518
	703,584		684,219
Less: accumulated depreciation	369,599		359,158
	$	333,985	$	325,061

The reduction in the construction in progress balance at December 28, 2013 was primarily due to the capitalization of assets related to the Neenah footprint expansion. The most significant component of the construction in progress balance at December 28, 2013 is related to footprint expansion in Guadalajara, Mexico. The major component of the construction in progress balance at September 28, 2013 was related to footprint expansion in Neenah.

NOTE 4—DEBT

On May 15, 2012, the Company entered into a five-year, $250 million senior unsecured credit facility that terminates on May 15, 2017 (the “Credit Facility”). The Credit Facility includes a $160 million revolving credit facility and a $90 million term loan. The revolving credit facility may be increased by $100 million (the "increase option") to $260 million generally by mutual agreement of the Company, the lenders, the letter of credit issuers and the administrative agent named in the related credit agreement (the "Credit Agreement"), subject to certain customary conditions. Quarterly principal repayments of the term loan of $3.75 million per quarter began on June 29, 2012 and ended on March 28, 2013. The final $75 million payment is due on May 15, 2017. In the fiscal first quarter of 2014, the Company borrowed and repaid $45.0 million under the revolving credit facility. As of December 28, 2013, the Company had term loan borrowings of $75 million and no revolving borrowings outstanding under the Credit Facility.

The financial covenants (as defined under the Credit Agreement) require that the Company maintain, as of each fiscal quarter end, a maximum total leverage ratio and a minimum interest coverage ratio. As of December 28, 2013, the Company was in compliance with all financial covenants of the Credit Agreement. Borrowings under the Credit Facility, at the Company's option, bear interest at a defined base rate or the LIBOR rate plus, in each case, an applicable margin based upon the Company's leverage ratio as defined in the Credit Agreement. Rates would increase upon negative changes in specified Company financial metrics and would decrease to no less than LIBOR plus 1.00% or base rate plus 0% upon reduction in the current total leverage ratio. As of December 28, 2013, the Company had a borrowing rate of LIBOR plus 1.13%. As of December 28, 2013, all outstanding debt under the Credit Facility is at a fixed interest rate as a result of the interest rate swap

7

contract discussed in Note 5, "Derivatives and Fair Value Measurements." There is no floating rate debt outstanding under the Credit Facility as of December 28, 2013. The Company is also required to pay an annual commitment fee on the unused revolver credit commitment based on the Company's leverage ratio; the fee was 0.2% as of December 28, 2013.

In the second quarter of fiscal 2012, the Company incurred approximately $0.9 million in new debt issuance costs in connection with the Credit Facility, which are being amortized over the five-year term of the Credit Facility.

The Company also has outstanding 5.20% Senior Notes, due on June 15, 2018 (the “Notes”); $175 million principal of the Notes was outstanding as of both December 28, 2013 and September 28, 2013. At December 28, 2013, the Company was in compliance with all financial covenants relating to the Notes, which are consistent with those in the Credit Agreement discussed above.

NOTE 5—DERIVATIVES AND FAIR VALUE MEASUREMENTS

All derivatives are recognized in the accompanying Condensed Consolidated Balance Sheets at their estimated fair value. The Company uses derivatives to manage the variability of foreign currency obligations and interest rates. The Company has cash flow hedges related to variable rate debt and forecasted foreign currency obligations, in addition to fair value hedges to manage foreign currency exposures associated with certain foreign currency denominated assets and liabilities. The Company does not enter into derivatives for speculative purposes. Changes in the fair value of the derivatives that qualify as cash flow hedges are recorded in “Accumulated other comprehensive income” in the accompanying Condensed Consolidated Balance Sheets until earnings are affected by the variability of the cash flows.

The Company enters into forward currency exchange contracts on a rolling basis. The Company had cash flow hedges outstanding with a notional value of $60.0 million as of December 28, 2013. These forward currency contracts fix the exchange rates for the settlement of future foreign currency obligations that have yet to be realized. The total fair value of the cash flow hedges was a $1.5 millionliability as of December 28, 2013 and a $1.0 million liability as of September 28, 2013.

In addition, the Company had fair value derivatives outstanding with a notional value of $25.0 million as of December 28, 2013. The Company has not designated these derivative instruments as hedging instruments. The net settlement amount (fair value) related to these contracts is recorded on the Condensed Consolidated Balance Sheets as either a current or long-term asset or liability and as an element of other (income) expense. The total fair value of these derivatives was a $0.1 millionasset as of December 28, 2013. No contracts were outstanding as of September 28, 2013.

On June 4, 2013, the Company entered into an interest rate swap contract to replace the three interest rate swap contracts that matured on April 4, 2013, as described below. The new interest rate swap contract is related to the $75.0 million term loan under the Credit Facility. This interest rate swap pays the Company variable interest at the one month LIBOR rate, and the Company pays the counterparty a fixed interest rate. The fixed interest rate for the contract is 0.875%. Based on the terms of the interest rate swap contract and the underlying debt, the interest rate contract was determined to be effective, and thus qualifies as a cash flow hedge. As such, any changes in the fair value of the interest rate swap are recorded in “Accumulated other comprehensive income” on the accompanying Condensed Consolidated Balance Sheets until earnings are affected by the variability of cash flows. The total fair value of the interest rate swap contract was a $0.1 million asset as of December 28, 2013 and a $0.03 million asset as of September 28, 2013. The notional amount of the Company’s interest rate swap was $75.0 million as of December 28, 2013 and September 28, 2013.

The Company previously entered into three interest rate swap contracts related to the term loans under its prior credit facility that had an initial total notional value of $150 million and matured on April 4, 2013, which resulted in a $2.0 million discrete tax benefit in the three months ended June 29, 2013. The fixed interest rates for each of these contracts were 4.415%, 4.490% and 4.435%, respectively. These interest rate swap contracts were originally entered into to convert $150 million of the variable rate term loan under the prior credit facility into fixed rate debt. Based on the terms of the interest rate swap contracts and the underlying debt, these interest rate contracts were determined to be effective, and thus qualified as a cash flow hedge. As such, any changes in the fair value of these interest rate swaps were recorded in “Accumulated other comprehensive income” on the accompanying Condensed Consolidated Balance Sheets until earnings were affected by the variability of cash flows. The total fair value of these interest rate swap contracts was a $1.7 million liability as of December 29, 2012.

The tables below present information regarding the fair values of derivative instruments (as defined in Note 1, "Basis of Presentation and Accounting Policies") and the effects of derivative instruments on the Company’s Condensed Consolidated Financial Statements:

8

Fair Values of Derivative Instruments
In thousands of dollars
	Asset Derivatives					Liability Derivatives
		December 28, 2013		September 28, 2013			December 28, 2013		September 28, 2013
Derivatives designated as hedging instruments	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
Interest rate swaps	Prepaid expenses and other	$	135	$	34	Current liabilities – other	$	—	$	—
Forward contracts	Prepaid expenses and other	$	—	$	—	Current liabilities – other	$	1,491	$	999

Fair Values of Derivative Instruments
In thousands of dollars
	Asset Derivatives					Liability Derivatives
		December 28, 2013		September 28, 2013			December 28, 2013		September 28, 2013
Derivatives not designated as hedging instruments	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
Forward contracts	Prepaid expenses and other	$	135	$	—	Current liabilities – other	$	—	$	—

The Effect of Derivative Instruments on the Condensed Statements of Comprehensive Income
for the Three Months Ended
In thousands of dollars
Derivatives in Cash Flow Hedging Relationships	Amount of Gain or (Loss) Recognized in Other Comprehensive Income (“OCI”) on Derivative (Effective Portion)						Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	December 28, 2013			December 29, 2012				December 28, 2013			December 29, 2012				December 28, 2013		December 29, 2012
Interest rate swaps	$	(31	)	$	(805	)	Interest income (expense)	$	(132	)	$	(786	)	Other income (expense)	$	—	$	—
Forward contracts	$	(743	)	$	79		Selling and administrative expenses	$	(250	)	$	493		Other income (expense)	$	—	$	—
Treasury rate locks	$	—		$	—		Interest income (expense)	$	79		$	79		Other income (expense)	$	—	$	—
Income tax (benefit) expense	$	—		$	—		Income tax (benefit) expense	$	52		$	—		Income tax (benefit) expense	$	—	$	—

For the three months endedDecember 28, 2013, the derivative instruments that are not designated as hedging instruments resulted in the recognition of a $0.1 million gain recorded in other (income) expense on the Condensed Consolidated Statement of Comprehensive Income.

During the third quarter of fiscal 2011, when the fixed interest rate for the Company's issuance of $175 million of Notes was determined, all three related treasury rate lock contracts that were previously entered into settled and the Company received proceeds of $2.3 million, which is being amortized over the seven year term of the related debt.

The following table lists the fair values of assets/(liabilities) of the Company’s derivatives as of December 28, 2013, by input level as defined above (in thousands):

Derivatives	Level 1		Level 2			Level 3		Total
Interest rate swaps	$	—	$	135		$	—	$	135
Foreign currency forward contracts - designated as hedging instruments	$	—	$	(1,491	)	$	—	$	(1,491	)
Foreign currency forward contracts - not designated as hedging instruments	$	—	$	135		$	—	$	135

9

The fair value of interest rate swaps and foreign currency forward contracts is determined using a market approach which includes obtaining directly or indirectly observable values from third parties active in the relevant markets. The primary input in the fair value of the interest rate swaps is the relevant LIBOR forward curve. Inputs in the fair value of the foreign currency forward contracts include prevailing forward and spot prices for currency and interest rate forward curves.

NOTE 6—EARNINGS PER SHARE

The following is a reconciliation of the amounts utilized in the computation of basic and diluted earnings per share (in thousands, except per share amounts):

	Three Months Ended
	December 28, 2013		December 29, 2012
Basic and Diluted Earnings Per Share:
Net income	$	17,663	$	16,616
Basic weighted average common shares outstanding	33,730		34,836
Dilutive effect of share-based awards outstanding	963		447
Diluted weighted average shares outstanding	34,693		35,283
Earnings per share:
Basic	$	0.52	$	0.48
Diluted	$	0.51	$	0.47

For the three months endedDecember 28, 2013 and December 29, 2012, stock options and stock-settled SARs for approximately 0.5 million and 2.1 million shares, respectively, were not included in the computation of diluted earnings per share because the options' and stock-settled SARs' exercise prices were greater than the average market price of the Company's common shares and, therefore, their effect would be anti-dilutive.

As a result of the Company's stock repurchase programs, there were fewer shares outstanding for the three months endedDecember 28, 2013 as compared to the three months endedDecember 29, 2012. Refer to Note 12, "Shareholders' Equity" for further information on the Company's stock repurchase programs.

NOTE 7—STOCK-BASED COMPENSATION

The Company recognized $2.6 million and $2.8 million of compensation expense associated with stock-based awards for the three months endedDecember 28, 2013 and December 29, 2012, respectively.

The Company uses the Black-Scholes valuation model to determine the fair value of stock options and stock-settled SARs. The Company uses the fair value at the date of grant to value restricted stock units ("RSUs") and unrestricted stock awards. The Company recognizes stock-based compensation expense over the stock-based awards’ vesting period.

NOTE 8—INCOME TAXES

Income tax expense for the three months endedDecember 28, 2013 and December 29, 2012 was $2.2 million and $1.1 million, respectively. The effective tax rates for the three months endedDecember 28, 2013 and December 29, 2012 were 11 percent and 6 percent, respectively. The increase in the effective tax rate for the three months endedDecember 28, 2013, compared to the effective tax rate for the prior year period, was primarily due to an increase in income in China. A tax holiday reducing the tax rate for an entity in China expired on December 31, 2013. The Company anticipates the end of this holiday will have a negligible impact to the annualized effective tax rate for fiscal 2014. As demonstrated in recent quarters, the Company's overall tax rate will vary during the year based on the mix of forecasted earnings by taxing jurisdiction.

As of December 28, 2013, there was no material change in the amount of unrecognized tax benefits recorded for uncertain tax positions as compared to fiscal 2013 year end. The Company recognizes accrued interest and penalties related to uncertain tax positions in income tax expense. The amount of interest and penalties recorded for both the three months endedDecember 28, 2013 and December 29, 2012 was not material.

It is reasonably possible that a number of uncertain tax positions related to federal and state tax positions may be settled within the next 12 months. The Company is currently under examination by taxing authorities in the U.S.; however, the Company is not currently under examination in any of the foreign jurisdictions in which the Company has significant operations.

10

The Company maintains valuation allowances when it is more likely than not that all or a portion of a deferred tax asset will not be realized. During the three months endedDecember 28, 2013, the Company continued to record a full valuation allowance against its net deferred tax assets in the U.S., Germany, Romania and the U.K., as it is more likely than not that these assets will not be fully realized based primarily on historical performance. The Company will continue to provide a valuation allowance against its net deferred tax assets in each of the applicable jurisdictions going forward until the need for a valuation allowance is eliminated. The need for a valuation allowance will be eliminated when the Company determines it is more likely than not that the deferred tax assets will be realized.

NOTE 9—BUSINESS SEGMENTS

Reportable segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in assessing performance and allocating resources.

The Company uses an internal management reporting system, which provides important financial data to evaluate performance and allocate the Company’s resources on a regional basis. Net sales for segments are attributed to the region in which the product is manufactured or service is performed. The services provided, manufacturing processes used, class of customers serviced and order fulfillment processes used are similar and generally interchangeable across the segments. A segment’s performance is evaluated based upon its operating income (loss). A segment’s operating income (loss) includes its net sales less cost of sales and selling and administrative expenses, but excludes corporate and other costs, interest expense, other income (loss), and income taxes. Corporate and other costs primarily represent corporate selling and administrative expenses, and restructuring and impairment costs, if any. These costs are not allocated to the segments, as management excludes such costs when assessing the performance of the segments. Inter-segment transactions are generally recorded at amounts that approximate arm’s length transactions. The accounting policies for the regions are the same as for the Company taken as a whole.

11

Information about the Company’s three reportable segments for the three months endedDecember 28, 2013 and December 29, 2012, respectively, follows (in thousands):

	Three Months Ended
	December 28, 2013			December 29, 2012
Net sales:
AMER	$	265,009		$	259,024
APAC	270,150			272,429
EMEA	26,814			28,170
Elimination of inter-segment sales	(28,068		)	(29,091		)
	$	533,905		$	530,532
Operating income (loss):
AMER	$	17,056		$	19,278
APAC	31,942			25,200
EMEA	(2,465		)	(222		)
Corporate and other costs	(24,772		)	(22,772		)
	$	21,761		$	21,484
Other income (expense):
Interest expense	$	(2,815	)	$	(3,720	)
Interest income	639			397
Miscellaneous	240			(475		)
Income before income taxes	$	19,825		$	17,686
	December 28, 2013			September 28, 2013
Total assets:
AMER	$	436,872		$	423,048
APAC	874,714			828,672
EMEA	106,597			111,977
Corporate	55,231			83,987
	$	1,473,414		$	1,447,684

NOTE 10—GUARANTEES

The Company offers certain indemnifications under its customer manufacturing agreements. In the normal course of business, the Company may from time to time be obligated to indemnify its customers or its customers’ customers against damages or liabilities arising out of the Company’s negligence, misconduct, breach of contract, or infringement of third party intellectual property rights. Certain agreements have extended broader indemnification, and while most agreements have contractual limits, some do not. However, the Company generally does not provide for such indemnities and seeks indemnification from its customers for damages or liabilities arising out of the Company’s adherence to customers’ specifications or designs or use of materials furnished, or directed to be used, by its customers. The Company does not believe its obligations under such indemnities are material.

In the normal course of business, the Company also provides its customers a limited warranty covering workmanship, and in some cases materials, on products manufactured by the Company. Such warranty generally provides that products will be free from defects in the Company’s workmanship and meet mutually agreed-upon specifications for periods generally ranging from 12 months to 24 months. If a product fails to comply with the Company’s limited warranty, the Company’s obligation is generally limited to correcting, at its expense, any defect by repairing or replacing such defective product. The Company’s warranty generally excludes defects resulting from faulty customer-supplied components, design defects or damage caused by any party or cause other than the Company.

The Company provides for an estimate of costs that may be incurred under its limited warranty at the time product revenue is recognized and establishes additional reserves for specifically identified product issues. These costs primarily include labor and

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materials, as necessary, associated with repair or replacement and are included in the Company’s accompanying Condensed Consolidated Balance Sheets in other current accrued liabilities. The primary factors that affect the Company’s warranty liability include the value and the number of shipped units and historical and anticipated rates of warranty claims. As these factors are impacted by actual experience and future expectations, the Company assesses the adequacy of its recorded warranty liabilities and adjusts the amounts as necessary.

Below is a table summarizing the activity related to the Company’s limited warranty liability for fiscal 2013 and for the three months endedDecember 28, 2013 (in thousands):

Limited warranty liability, as of September 29, 2012	$	5,145
Accruals for warranties issued during the period	1,168
Settlements (in cash or in kind) during the period	(371		)
Limited warranty liability, as of September 28, 2013	5,942
Accruals for warranties issued during the period	387
Settlements (in cash or in kind) during the period	(260		)
Limited warranty liability, as of December 28, 2013	$	6,069

NOTE 11—LITIGATION

The Company is party to lawsuits in the ordinary course of business. Management does not believe that these proceedings, individually or in the aggregate, will have a material positive or adverse effect on the Company’s consolidated financial position, results of operations or cash flows.

NOTE 12—SHAREHOLDERS' EQUITY

On August 19, 2013, the Board of Directors approved a stock repurchase program under which the Company is authorized to repurchase up to $30 million of its common stock. During the three months endedDecember 28, 2013, the Company repurchased 173,884 shares for approximately $6.9 million, at an average price of $39.88 per share. These shares were recorded as treasury stock. In addition, as of December 28, 2013, the Company had a commitment of approximately $0.5 million to purchase 12,214 shares, which were purchased before December 28, 2013, but settled after the end of the fiscal first quarter.

On October 23, 2012, the Board of Directors approved a stock repurchase program under which the Company was authorized to repurchase up to $50 million of its common stock. During the three months ended December 29, 2012, the Company repurchased 262,422 shares for approximately $6.1 million, at an average price of $23.13 per share. The Company repurchased 1,821,698 shares under this program in fiscal 2013 for approximately $49.9 million, at an average price of $27.37 per share. These shares were recorded as treasury stock.

NOTE 13—RESTRUCTURING COSTS

For the three months ended December 28, 2013, the Company incurred restructuring costs of $3.6 million, which consisted of the following:

• $1.5 million of rent and associated costs resulting from the early exit of operating leases for two existing Neenah, Wisconsin facilities;

• $1.8 million of moving costs to consolidate two existing Neenah, Wisconsin and one existing Appleton, Wisconsin (being sometimes referred to as the "Fox Cities") facilities into the new Neenah, Wisconsin manufacturing facility; and

• $0.3 million of severance from the reduction of the Company's workforce in the Fox Cities, Wisconsin and in the United Kingdom.

The Company's restructuring cost accrual activity for the three months ended December 28, 2013 is included in the table below:

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	Employee
	Termination				Other
	and Severance		Lease		Exit
	Costs		Obligations		Costs			Total
Accrual balance, September 28, 2013	$	—	$	—	$	—		$	—
Restructuring costs	0.3		1.8		1.5			3.6
Amounts utilized	—		—		(0.7		)	(0.7		)
Accrual balance, December 28, 2013	$	0.3	$	1.8	$	0.8		$	2.9

The accrual balance is expected to be utilized in the remainder of fiscal 2014.

NOTE 14—NEW ACCOUNTING PRONOUNCEMENTS

In July 2013, the Financial Accounting Standards Board (“FASB”) issued new guidance for unrecognized tax benefits that exist along with a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The guidance requires an entity to present an unrecognized tax benefit as a reduction of a deferred tax asset for an net operating loss ("NOL") carryforward, or similar tax loss or tax credit carryforward, rather than as a liability when (1) the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and (2) the entity intends to use the deferred tax asset for that purpose. This guidance is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Early adoption and retrospective application are permitted. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements.

In July 2013, the FASB issued amended guidance that permits the Fed Funds Effective Swap Rate (also referred to as the Overnight Index Swap Rate, or "OIS") to be used as a U.S. benchmark interest rate for hedge accounting purposes, in addition to Treasury obligations of the U.S. government ("UST") and the London Interbank Offered Rate ("LIBOR"). The amendments also remove the restriction on using different benchmark rates for similar hedges. This update is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements or results of operations.

In March 2013, the FASB issued amended guidance for cumulative translation adjustments upon derecognition of certain subsidiaries or groups of assets within a foreign entity or of an investment in a foreign entity. These amendments provide guidance on releasing cumulative translation adjustments when a reporting entity ceases to have a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity.  In addition, these amendments provide guidance on the release of cumulative translation adjustment in partial sales of equity method investments and in step acquisitions.  The amendments are effective on a prospective basis for fiscal years and interim reporting periods within those years, beginning after December 15, 2013. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

“SAFE HARBOR” CAUTIONARY STATEMENT:

The statements contained in this Form 10-Q that are guidance or which are not historical facts (such as statements in the future tense and statements including believe, expect, intend, plan, anticipate, goal, target and similar terms and concepts), including all discussions of periods which are not yet completed, are forward-looking statements that involve risks and uncertainties. These risks and uncertainties include, but are not limited to: the risk of customer delays, changes, cancellations or forecast inaccuracies in both ongoing and new programs; the poor visibility of future orders, particularly in view of changing economic conditions; the adequacy of restructuring and similar charges as compared to actual expenses; the economic performance of the industries, sectors and customers we serve; the effects of the volume of revenue from certain sectors or programs on our margins in particular periods; our ability to secure new customers, maintain our current customer base and deliver product on a timely basis; the particular risks relative to new or recent customers or programs, which risks include customer and other delays, start-up costs, potential inability to execute, the establishment of appropriate terms of agreements, and the lack of a track record of order volume and timing; the risks of concentration of work for certain customers; our ability to manage successfully a complex business model characterized by high customer and product mix, low volumes and demanding quality, regulatory, and other requirements; the risk that new program wins and/or customer demand may not result in the expected revenue or profitability; the fact that customer orders may not lead to long-term relationships; the effects of shortages and

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delays in obtaining components as a result of economic cycles or natural disasters; the risks associated with excess and obsolete inventory, including the risk that inventory purchased on behalf of our customers may not be consumed or otherwise paid for by the customer, resulting in an inventory write-off; the weakness of areas of the global economy; the effect of changes in the pricing and margins of products; the effect of start-up costs of new programs and facilities, such as our new facilities in China, Romania and the United States, our announced plans to open a new facility in Mexico and our other recent, planned and potential future expansions or replacements; increasing regulatory and compliance requirements; possible unexpected costs and operating disruption in transitioning programs; raw materials and component cost fluctuations; the potential effect of fluctuations in the value of the currencies in which we transact business; the potential effects of regional results on our taxes and ability to use deferred tax assets; the potential effect of world or local events or other events outside our control (such as drug cartel-related violence in Mexico, changes in oil prices, terrorism and weather events); the impact of increased competition; and other risks detailed below in “Risk Factors”, otherwise herein, and in our Securities and Exchange Commission filings (particularly in Part I, Item 1A of our annual report on Form 10-K for the fiscal year ended September 28, 2013).

OVERVIEW

Plexus Corp. and its subsidiaries (together “Plexus,” the “Company,” or “we”) participate in the Electronic Manufacturing Services (“EMS”) industry. We deliver optimized Product Realization solutions through a unique Product Realization Value Stream services model. This customer focused services model seamlessly integrates innovative product conceptualization, design, commercialization, manufacturing, fulfillment and sustaining services to deliver comprehensive end-to-end solutions for customers in the Americas ("AMER"), Asia-Pacific ("APAC") and Europe, Middle East and Africa ("EMEA") regions. Customer service is provided to over 140 branded product companies in the Networking/Communications, Healthcare/Life Sciences, Industrial/Commercial and Defense/Security/Aerospace market sectors. Our customers’ products typically require exceptional production and supply-chain flexibility, necessitating an optimized demand-pull-based manufacturing and supply chain solution across an integrated global platform. Many of our customers’ products require complex configuration management and direct order fulfillment to their customers across the globe. In such cases we provide global logistics management and after-market service and repair. Our customers’ products may have stringent requirements for quality, reliability and regulatory compliance. We offer our customers the ability to outsource all phases of product realization, including product specifications; development, design and design verification; regulatory compliance support; prototyping and new product introduction; manufacturing test equipment development; materials sourcing, procurement and supply-chain management; product assembly/manufacturing, configuration and test; order fulfillment, logistics and service/repair.

We provide most of our contract manufacturing services on a turnkey basis, which means that we procure some or all of the materials required for product assembly. We provide some services on a consignment basis, which means that the customer supplies the necessary materials, and we provide the labor and other services required for product assembly. Turnkey services require material procurement and warehousing, in addition to manufacturing, and involve greater resource investments than consignment services. Other than certain test equipment and software used for internal operations, we do not design or manufacture our own proprietary products.

The following information should be read in conjunction with our Condensed Consolidated Financial Statements included herein, the “Risk Factors” section in Part I, Item 1A of our annual report on Form 10-K for the fiscal year ended September 28, 2013 and our “Safe Harbor” Cautionary Statement included above.

Recent Developments

Our new Neenah, Wisconsin manufacturing facility, which is replacing one owned and two leased facilities, opened in the fiscal first quarter of 2014. Consolidation of the three Fox Cities facilities into our new facility resulted in $3.5 million of restructuring charges in the first fiscal quarter of 2014. The consolidation is expected to result in approximately $0.6 million of additional restructuring charges in the second fiscal quarter of 2014.

An additional $0.1 million of restructuring charges were incurred in the first fiscal quarter of 2014 for severance from the reduction of our workforce at our United Kingdom facility. No additional costs are expected.

RESULTS OF OPERATIONS

Consolidated Performance Summary

The following table presents selected consolidated financial data (dollars in millions, except per share data):

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	Three Months Ended
	December 28, 2013			December 29, 2012
Net sales	$	533.9		$	530.5
Gross profit	51.5			51.2
Gross margin	9.6		%	9.6		%
Operating income	21.8			21.5
Operating margin	4.1		%	4.1		%
Net income	17.7			16.6
Earnings per share (diluted)	$	0.51		$	0.47
Return on invested capital	14.5		%	12.6		%

Net sales. For the three months endedDecember 28, 2013, net sales increased by $3.4 million, or 0.6 percent, compared to the three months endedDecember 29, 2012, primarily as a result of new product ramps and market share wins in the healthcare/life sciences sector, as well as a $23.3 million increase in revenue from a key customer in the networking/communications sector driven by new product ramps. These increases were partially offset by a $64.1 million decrease in revenue from Juniper Networks, Inc. ("Juniper") related to its disengagement in 2013. Juniper related revenue was not significant to our net sales in the first quarter of fiscal 2014, as compared to 12% of our net sales in the same period of fiscal 2013. We expect no further revenue from Juniper in fiscal 2014.

Our net sales by market sector for the indicated periods were as follows (in millions):

	Three Months Ended
Market Sector	December 28, 2013		December 29, 2012
Networking/Communications	$	163.1	$	198.8
Industrial/Commercial	135.6		131.0
Healthcare/Life Sciences	164.9		133.0
Defense/Security/Aerospace	70.3		67.7
	$	533.9	$	530.5

Networking/Communications. Net sales for the networking/communications sector decreased $35.7 million for the three months endedDecember 28, 2013 as compared to the three months endedDecember 29, 2012. The decrease was primarily a result of a reduction in net sales to Juniper of $64.1 million, related to its disengagement, partially offset by an increase of $23.3 million in net sales to a customer in this sector as a result of new product ramps as well as market share gains with other existing customers.

Industrial/Commercial. Net sales for the industrial/commercial sector increased $4.6 million for the three months endedDecember 28, 2013 compared to the three months endedDecember 29, 2012. The increase was driven by $10.1 million in incremental revenue from a new customer combined with new product ramps and market share gains with other existing customers. This was partially offset by a $13.3 million reduction in revenue due to a customer disengagement.

Healthcare/Life Sciences. Net sales for the healthcare/life sciences sector increased $31.9 million for the three months endedDecember 28, 2013 compared to the three months endedDecember 29, 2012; $12.5 million of the increase was due to new program ramps and market share gains with an existing key customer, with the remainder resulting from increased net sales to various customers within the sector as a result of new program ramps and increased end-market demand.

Defense/Security/Aerospace. Net sales for the defense/security/aerospace sector increased $2.6 million for the three months endedDecember 28, 2013 compared to the three months endedDecember 29, 2012. The increase was the result of increased net sales to most customers in this sector, new program ramps and increased end-market demand.

Gross profit. For the three months endedDecember 28, 2013, gross profit increased $0.3 million, or 0.6 percent, compared to the three months endedDecember 29, 2012 in line with the percentage increase in net sales. Overall gross margin remained consistent at 9.6 percent. Contribution margin increased by $4.1 million as a result of favorable changes in customer mix and decreased material costs in the APAC region. This favorable effect was largely offset by a $3.6 million increase in fixed costs

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due to our investment in a new manufacturing facility in Neenah, Wisconsin and increased depreciation and personnel expenses associated with the new manufacturing facility in Romania, which opened in June 2013.

Operating income. For the three months endedDecember 28, 2013, operating income increased $0.3 million compared to the three months endedDecember 29, 2012. A $3.6 million decrease in selling and administrative expenses (“S&A”) as compared to the prior year period was offset by $3.6 million of restructuring charges in the three months endedDecember 28, 2013 primarily related to the consolidation of facilities into our new Neenah, Wisconsin manufacturing facility, which opened in the fiscal first quarter of 2014. As a result, operating margin remained consistent at 4.1 percent for the three months endedDecember 28, 2013 and December 29, 2012.

Other income (expense). Other income (expense) decreased to $1.9 million of expense for the three months endedDecember 28, 2013, as compared to $3.8 million of expense for the three months endedDecember 29, 2012. The decrease in other expense was primarily the result of a $0.9 million decrease in interest expense related to lower fixed interest rates resulting from interest rate swaps, as discussed in Note 5, "Derivatives and Fair Value Measurements," in Notes to Condensed Consolidated Financial Statements, a $0.6 million reduction in currency exchange loss and a $0.2 million increase in interest income in the current period as compared to the prior year period.

Income taxes. Effective annual income tax rates for the indicated periods were as follows:

	Three Months Ended
	December 28, 2013	December 29, 2012
Effective annual tax rate	11%	6%

Income tax expense increased to $2.2 million for the three months endedDecember 28, 2013, as compared to $1.1 million for the three months endedDecember 29, 2012, as a result of the increase in our effective tax rate. Our effective tax rate varies from the U.S. statutory rate of 35 percent primarily as a result of the amount of earnings from different U.S. and foreign jurisdictions, and tax holidays granted to our subsidiaries in Malaysia and China, where we derive a significant portion of our earnings. The effective tax rate for the three months endedDecember 28, 2013 is higher than the effective tax rate for the three months endedDecember 29, 2012 primarily as a result of increased income in China. A tax holiday reducing the tax rate for an entity in China expired on December 31, 2013. We anticipate that the end of this holiday will have a negligible impact to the annualized effective rate for fiscal 2014. Our overall effective tax rate will fluctuate in the future depending on the geographic distribution of our worldwide earnings.

The estimated annual effective tax rate for all of fiscal 2014 is expected to be between 9 percent and 11 percent.

Net income. Net income for the three months endedDecember 28, 2013 increased by $1.1 million, or 6.6 percent, to $17.7 million from $16.6 million for the three months endedDecember 29, 2012. Net income increased as a result of decreased other expense, as discussed above, partially offset by increased income tax expense, as discussed above.

Diluted earnings per share. Diluted earnings per share increased to $0.51 for the three months endedDecember 28, 2013 as compared to $0.47 for the three months endedDecember 29, 2012. The increase in diluted earnings per share for the period was primarily the result of the slight increase in net income noted above combined with a decrease in the number of shares outstanding as a result of our stock repurchase program.

Return on Invested Capital (“ROIC”). We use a 5-5 financial model which is aligned with our business strategy, and includes a ROIC goal of 5% over our weighted average cost of capital (“WACC”) and a 5% operating margin target. Our primary focus is our ROIC goal, which is designed to create shareholder value and generate enough cash to self-fund our targeted organic revenue growth rate of 12%.

We review our internal calculation of WACC annually, and our estimated WACC is 11.0% for fiscal 2014. By exercising discipline to generate ROIC in excess of our WACC, our goal is to create value for our shareholders. ROIC was 14.5% and 12.6% for the three months endedDecember 28, 2013 and December 29, 2012, respectively. The current period ROIC of 14.5% was calculated excluding restructuring charges of $3.6 million. The period over period increase in ROIC was due to higher annualized operating income and lower average invested capital (as defined below).

We define ROIC as tax-effected annualized operating income, excluding special items such as restructuring charges, divided by average invested capital over a rolling two-quarter period for the first quarter. Invested capital is defined as equity plus debt, less cash and cash equivalents. Other companies may not define or calculate ROIC in the same way. ROIC is a non-GAAP

17

financial measure which should be considered in addition to, not as a substitute for, measures of our financial performance prepared in accordance with United States generally accepted accounting principles (“GAAP”).

Non-GAAP financial measures, including ROIC, are used for internal management assessments because such measures provide additional insight into ongoing financial performance. In particular, we provide ROIC because we believe it offers insight into the metrics that are driving management decisions. We view ROIC as an important measure in evaluating the efficiency and effectiveness of our long-term capital requirements. We also use ROIC as a performance criteria in determining certain elements of compensation.

For a reconciliation of ROIC to our financial statements that were prepared using GAAP, see exhibit 99.1 to this quarterly report on Form 10-Q, which exhibit is incorporated herein by reference.

REPORTABLE SEGMENTS

A further discussion of financial performance by reportable segment is presented below (dollars in millions):

	Three Months Ended
	December 28, 2013			December 29, 2012
Net sales:
AMER	$	265.0		$	259.0
APAC	270.2			272.4
EMEA	26.8			28.2
Elimination of inter-segment sales	(28.1		)	(29.1		)
	$	533.9		$	530.5
Operating income (loss):
AMER	$	17.1		$	19.3
APAC	31.9			25.2
EMEA	(2.4		)	(0.2		)
Corporate and other costs	(24.8		)	(22.8		)
	$	21.8		$	21.5

Americas (AMER): Net sales for the three months endedDecember 28, 2013 increased $6.0 million, or 2.3 percent, as compared to the prior year period primarily due to a $13.7 million increase in net sales from a networking/communications sector customer, as a result of market share gains, and $10.0 million in net sales to a new customer in the industrial/commercial sector. This increase was partially offset by reduced sales to Juniper related to its disengagement. Operating income for the three months endedDecember 28, 2013 decreased $2.2 million, or 11.4 percent, as compared to the prior year period, due primarily to increased fixed costs associated with the facility expansion in Neenah, Wisconsin.

Asia-Pacific (APAC): Net sales for the three months endedDecember 28, 2013 decreased $2.2 million, or 0.8 percent, as compared to the prior year period. The decrease in net sales as compared to the prior period was driven by $39.5 million of reduced sales to Juniper related to its disengagement, partially offset by $23.3 million of increased net sales to a customer in the networking/communications sector, driven by new product ramps, as well as increases in net sales to various other customers resulting from new program ramps and market share gains. Operating income for the three months endedDecember 28, 2013 increased $6.7 million, or 26.6 percent, as compared to the prior year period due primarily to favorable changes in customer mix and lower materials cost.

Europe, Middle East, Africa (EMEA): Net sales for the three months endedDecember 28, 2013 decreased $1.4 million, or 5.0 percent, as compared to the prior year period due to the disengagement of a customer in the industrial/commercial sector. Operating loss for the three months endedDecember 28, 2013 increased $2.2 million, as compared to the prior year period, primarily due to $1.4 million of increased fixed manufacturing expenses, in both Romania and the United Kingdom, resulting from increased depreciation and personnel expenses associated with facility expansions.

LIQUIDITY AND CAPITAL RESOURCES

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Cash and cash equivalents were $324.2 million as of December 28, 2013 compared to $341.9 million as of September 28, 2013. The decrease in the balance of our cash and cash equivalents was due primarily to the return of $26.3 million in customer deposits to Juniper related to its disengagement.

As of December 28, 2013, approximately 94% of our cash balance was held outside of the U.S. by our foreign subsidiaries. Certain foreign countries impose taxes and overall penalties on transfers of cash; however, our intent is to permanently reinvest funds held in these countries. If this cash were remitted to the U.S., additional tax obligations may result that would reduce the amount of cash ultimately available to us in the U.S. Currently, we believe that cash held in the U.S., together with cash available under U.S. credit facilities and cash from foreign subsidiaries that could be remitted to the U.S. without tax consequences, will be sufficient to meet our U.S. liquidity needs for the next twelve months and for the foreseeable future.

Cash Flows. The table below shows a summary of cash flows for the periods presented (dollars in millions):

	Three Months Ended
	December 28, 2013			December 29, 2012
Cash provided by operating activities	$	3.7		$	8.5
Cash used in investing activities	(21.7		)	(25.8		)
Cash used in financing activities	$	(0.4	)	$	(6.7	)

Operating Activities. Cash flows provided by operating activities were $3.7 million for the three months endedDecember 28, 2013, as compared to cash flows provided by operating activities of $8.5 million for the three months endedDecember 29, 2012. Cash flows provided by operating activities decreased due to increased working capital needs (primarily related to inventory), partially offset by higher net income and a favorable change in accrued liabilities.

The following table shows a summary of cash cycle days for the periods indicated (in days):

	Three Months Ended
	December 28, 2013		December 29, 2012
Days in accounts receivable	51		50
Days in inventory	83		92
Days in accounts payable	(64	)	(61	)
Days in cash deposits	(8	)	(7	)
Annualized cash cycle	62		74

We calculate days in accounts receivable as accounts receivable for the respective quarter divided by annualized sales for the respective quarter by day. We calculate days in inventory, accounts payable, and cash deposits as each balance sheet line item for the respective quarter divided by annualized cost of sales for the respective quarter by day.

Days in accounts receivable for the three months endedDecember 28, 2013 increased by one day compared to the three months endedDecember 29, 2012 as there are no receivables related to Juniper for the current quarter compared to the prior year period.

Days in inventory for the three months endedDecember 28, 2013 decreased by nine days compared to the three months endedDecember 29, 2012, primarily due to the elimination of inventory held for Juniper related to its disengagement.

Days in accounts payable for the three months endedDecember 28, 2013 increased by three days compared to the three months endedDecember 29, 2012, primarily due to improved terms with suppliers and timing of materials purchases.

Days in cash deposits for the three months endedDecember 28, 2013 increased by 1 day compared to the three months endedDecember 29, 2012, primarily as a result of a $9.1 million increase in deposits from various customers.

We calculate annualized cash cycle as the sum of days in accounts receivable and days in inventory, less days in accounts payable and days in cash deposits. For the three months endedDecember 28, 2013 annualized cash cycle days improved by twelve days compared to the three months endedDecember 29, 2012 due to the factors noted above.

Free Cash Flow. Free cash flow (“FCF”), which we define as cash flow provided by (used in) operations less capital expenditures, decreased for the three months endedDecember 28, 2013, to a utilization of $18.1 million, as compared to a

19

utilization of $17.3 million for the three months endedDecember 29, 2012. The primary use of cash was to fund capital expenditures for footprint expansion in Neenah, Wisconsin and Guadalajara, Mexico.

Non-GAAP financial measures, including FCF, are used for internal management assessments because such measures provide additional insight into ongoing financial performance. In particular, we provide FCF because we believe it offers insight into the metrics that are driving management decisions. We view FCF as an important financial metric as it demonstrates our ability to generate cash and allows us to pursue opportunities that enhance shareholder value. FCF is a non-GAAP financial measure which should be considered in addition to, not as a substitute for, measures of our financial performance prepared in accordance with U.S. GAAP.

For a reconciliation of FCF to our financial statements that were prepared using GAAP, see below (in millions):

	Three Months Ended
	December 28, 2013			December 29, 2012
Cash provided by operating activities	$	3.7		$	8.5
Capital expenditures	(21.8		)	(25.8		)
Free cash flow	$	(18.1	)	$	(17.3	)

Investing Activities. Cash flows used in investing activities totaled $21.7 million for the three months endedDecember 28, 2013 as compared to cash flows used in investing activities of $25.8 million for the three months endedDecember 29, 2012. Cash flows used in investing activities decreased primarily due to the completion of footprint expansion in Neenah, Wisconsin.

We utilized available cash and operating cash flows as the sources for funding our operating requirements. We currently estimate capital expenditures for fiscal 2014 to be approximately $75 million of which $21.8 million of expenditures were made through the first quarter of fiscal 2014. A significant portion of the remaining fiscal 2014 capital expenditures is anticipated to be used to support new program ramps and leasehold improvements for our new manufacturing facility in Guadalajara, Mexico. We believe the estimated capital expenditures will continue to be funded from operations, and may be supplemented by short-term borrowings, if required.

Financing Activities.Cash flows used in financing activities totaled $0.4 million for the three months endedDecember 28, 2013, as compared to cash flows used in financing activities of $6.7 million for the three months endedDecember 29, 2012. In the quarter ended December 28, 2013, we borrowed and repaid $45.0 million under our revolving credit facility (described below). Cash flows used in financing activities for the three months endedDecember 28, 2013 were comprised primarily of $6.9 million of purchases of common stock as part of our stock repurchase program as well as payments on capital leases. Cash flows used in financing activities in the current quarter were offset by $7.5 million of proceeds received from the exercise of stock options. Cash flows used in financing activities for the three months endedDecember 29, 2012 were comprised primarily of purchases of common stock as part of our stock repurchase program.

On August 29, 2013, the Board of Directors approved a stock repurchase program under which the Company is authorized to repurchase up to $30 million of its common stock. As of December 28, 2013, the Company had repurchased 173,884 shares for approximately $6.9 million, at an average price of $39.88 per share. These shares were recorded as treasury stock. In addition, as of December 28, 2013, the Company had a commitment of approximately $0.5 million to purchase 12,214 shares, which were purchased before December 28, 2013, but settled after the end of the fiscal first quarter. It is anticipated that this program will continue to be funded with existing cash and is expected to be executed on a relatively consistent basis during the remainder of fiscal 2014.

On May 15, 2012, the Company entered into a five-year, $250 million senior unsecured credit facility that terminates on May 15, 2017 (the “Credit Facility”). The Credit Facility includes a $160 million revolving credit facility and a $90 million term loan. The revolving credit facility potentially may be increased by $100 million (the "increase option") to $260 million generally by mutual agreement of the Company, the lenders, the letter of credit issuers and the administrative agent named in the related credit agreement (the "Credit Agreement"), subject to certain customary conditions. Quarterly principal repayments of the Credit Facility term loan of $3.75 million per quarter ended on March 28, 2013. The final $75 million payment is due on May 15, 2017.

The financial covenants (as defined under the Credit Agreement) require that the Company maintain, as of each fiscal quarter end, a maximum total leverage ratio and a minimum interest coverage ratio. As of December 28, 2013, the Company was in compliance with all financial covenants of the Credit Facility. Borrowings under the Credit Facility, at the Company's option,

20

bear interest at a defined base rate or the LIBOR rate plus, in each case, an applicable margin based upon the Company's leverage ratio as defined in the Credit Agreement. Rates would increase upon negative changes in specified Company financial metrics and would decrease upon reduction in the current total leverage ratio, to no less than LIBOR plus 1.00% or the base rate plus 0%. We are also required to pay an annual commitment fee on the unused revolver credit commitment based on our leverage ratio; the fee was 0.2% as of December 28, 2013. On June 4, 2013, the Company entered into a new interest rate swap associated with the term loan which extends through May 5, 2017. As of September 28, 2013, all outstanding debt under the Credit Facility is at a fixed interest rate as a result of a fixed interest rate swap contract. There is no floating rate debt outstanding under the Credit Facility as of September 28, 2013.

The Note Purchase Agreement related to the $175.0 million in principal amount of the Company's 5.20% Senior Notes, due on June 15, 2018 (the "Notes"), contains certain financial covenants, which include a maximum total leverage ratio, a minimum interest coverage ratio and a minimum net worth test, all as defined in the agreements. As of December 28, 2013, we were in compliance with all such covenants relating to the Notes and the related Note Purchase Agreement, which are consistent with those in the Credit Agreement discussed above.

The Credit Facility and Note Purchase Agreement allow for the future payment of cash dividends or the future repurchases of shares provided that no event of default (including any failure to comply with a financial covenant) exists at the time of, or would be caused by, the dividend payment or the share repurchases. We have not paid cash dividends in the past and do not currently anticipate paying them in the future. However, we evaluate from time to time potential uses of excess cash, which in the future may include share repurchases above those already authorized, a special dividend or recurring dividends.

Based on current expectations, we believe that our projected cash flows from operations, available cash and cash equivalents, potential borrowings under the Credit Facility, and our leasing capabilities should be sufficient to meet our working capital and fixed capital requirements for the next twelve months and for the foreseeable future. If our future financing needs increase, we may need to arrange additional debt or equity financing. Accordingly, we evaluate and consider from time to time various financing alternatives to supplement our financial resources. However, particularly due to the current uncertainty of the credit and financial markets, we cannot be assured that we will be able to make any such arrangements on acceptable terms.

CONTRACTUAL OBLIGATIONS, COMMITMENTS AND OFF-BALANCE SHEET OBLIGATIONS

Our disclosures regarding contractual obligations and commercial commitments are located in various parts of our regulatory filings. Information in the following table provides a summary of our contractual obligations and commercial commitments as of December 28, 2013 (dollars in millions):

	Payments due by fiscal year
Contractual Obligations	Total		Remaining 2014		2015-2016		2017-2018		2019 and thereafter
Long-Term Debt Obligations (1,2)	$	294.3	$	7.7	$	20.7	$	265.9	$	—
Capital Lease Obligations	12.2		3.6		7.9		0.7		—
Operating Lease Obligations	43.2		9.6		14.8		6.7		12.1
Purchase Obligations (3)	344.5		330.0		14.2		—		0.3
Other Long-Term Liabilities on the Balance Sheet (4)	9.6		1.1		1.5		0.5		6.5
Other Long-Term Liabilities not on the Balance Sheet (5)	19.1		17.1		2.0		—		—
Total Contractual Cash Obligations	$	722.9	$	369.1	$	61.1	$	273.8	$	18.9

1) Includes amounts outstanding under the Credit Facility. As of December 28, 2013, the outstanding balance was $75.0 million. The amounts listed above include interest; see Note 4 in Notes to Condensed Consolidated Financial Statements for further information.

2) Includes $175.0 million in principal amount of Notes issued in fiscal 2011. The amounts listed above include interest; see Note 4 in Notes to Condensed Consolidated Financial Statements for further information.

3) As of December 28, 2013, purchase obligations consist of purchases of inventory and equipment in the ordinary course of business.

21

4) As of December 28, 2013, other long-term obligations on the balance sheet included deferred compensation obligations to certain of our former and current executive officers, as well as other key employees, and an asset retirement obligation. We have excluded from the above table the impact of approximately $7.5 million, as of December 28, 2013, related to unrecognized income tax benefits. The Company cannot make reliable estimates of the future cash flows by period related to this obligation.

5) As of December 28, 2013, other long-term obligations not on the balance sheet consisted of a commitment for salary continuation in the event employment of one executive officer of the Company is terminated without cause as well as commitments to complete a new manufacturing facility in Guadalajara, Mexico.

DISCLOSURE ABOUT CRITICAL ACCOUNTING POLICIES

Our critical accounting policies are disclosed in our 2013 annual report on Form 10-K. During the first quarter of fiscal 2014, there were no material changes to these policies.

NEW ACCOUNTING PRONOUNCEMENTS

See Note 14 in Notes to Condensed Consolidated Financial Statements for further information regarding new accounting pronouncements.

22

ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to market risk from changes in foreign exchange and interest rates. We selectively use financial instruments to reduce such risks.

Foreign Currency Risk

We do not use derivative financial instruments for speculative purposes. Our policy is to selectively hedge our foreign currency denominated transactions in a manner that partially offsets the effects of changes in foreign currency exchange rates. We typically use foreign currency contracts to hedge only those currency exposures associated with certain assets and liabilities denominated in non-functional currencies. Corresponding gains and losses on the underlying transaction generally offset the gains and losses on these foreign currency hedges. Our international operations create potential foreign exchange risk.

Our percentages of transactions denominated in currencies other than the U.S. dollar for the indicated periods were as follows:

	Three Months Ended
	December 28, 2013		December 29, 2012
Net sales	8	%	9	%
Total costs	6	%	17	%

The Company has evaluated the potential foreign currency exchange rate risk on transactions denominated in currencies other than the U.S. dollar for the periods presented above. Based on the Company’s overall currency exposure, as of December 28, 2013 a 10 percent change in the value of the U.S. dollar relative to our other transactional currencies would not have a material effect on the Company’s financial position, results of operations, or cash flows.

Interest Rate Risk

We have financial instruments, including cash equivalents, which are sensitive to changes in interest rates. We consider the use of interest rate swaps based on existing market conditions and have entered into interest rate swaps for our term loans. For more information, refer to Note 5, "Derivatives and Fair Value Measurements," in Notes to Condensed Consolidated Financial Statements. Interest rate swap agreements are subject to the further risk that the counterparties to these agreements may fail to comply with their obligations thereunder.

The primary objective of our investment activities is to preserve principal, while maximizing yields without significantly increasing market risk. To achieve this, we maintain our portfolio of cash equivalents in a variety of highly rated securities, money market funds and certificates of deposit, and limit the amount of principal exposure to any one issuer.

As of December 28, 2013, our only material interest rate risk is associated with our term loan under our Credit Facility. Through the use of interest rate swaps, as described above, we fixed the basis on which we pay interest, and the borrowings under the Note Purchase Agreement are based on a fixed interest rate, thus eliminating much of our interest rate risk.

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ITEM 4.    CONTROLS AND PROCEDURES

Disclosure Controls and Procedures: The Company maintains disclosure controls and procedures designed to ensure that the information the Company must disclose in its filings with the Securities and Exchange Commission (“SEC”) is recorded, processed, summarized and reported on a timely basis. The Company’s principal executive officer and principal financial officer have reviewed and evaluated, with the participation of the Company’s management, the Company’s disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) as of the end of the period covered by this report (the “Evaluation Date”). Based on such evaluation, the chief executive officer and chief financial officer have concluded that, as of the Evaluation Date, the Company’s disclosure controls and procedures are effective (a) in recording, processing, summarizing and reporting, on a timely basis, information required to be disclosed by the Company in the reports the Company files or submits under the Exchange Act, and (b) in assuring that information is accumulated and communicated to the Company’s management, including the chief executive officer and chief financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting: During the first quarter of fiscal 2014, there have been no changes to the Company’s internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

Limitations on the Effectiveness of Controls: Our management, including our chief executive officer and chief financial officer, does not expect that our disclosure controls and internal controls will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. Because of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the Company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple errors or mistakes. Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, a control may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

Notwithstanding the foregoing limitations on the effectiveness of controls, we have nonetheless reached the conclusion that the Company’s disclosure controls and procedures are effective at the reasonable assurance level.

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PART II. OTHER INFORMATION

ITEM 1A.    Risk Factors

In addition to the risks and uncertainties discussed herein, particularly those discussed in the “Safe Harbor” Cautionary Statement and "Management’s Discussion and Analysis of Financial Condition and Results of Operations" in Part I, Item 2, see the risk factors set forth in Part I, Item 1A of our annual report on Form 10-K for the fiscal year ended September 28, 2013.

ITEM 2.     Unregistered Sales Of Equity Securities and Use Of Proceeds

The following table provides the specified information about the repurchases of shares by the Company during the three months ended December 28, 2013.

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 approximate dollar value of shares that may yet be purchased under the plans or programs*
September 29 to October 26, 2013	—	$	—	—	$	30,000,000
October 27 to November 23, 2013	75,301	38.95		75,301	$	27,066,709
November 24 to December 28, 2013	98,583	40.58		98,583	$	23,065,795
Total	173,884	$	39.88	173,884

* On August 19, 2013, the Board of Directors approved a stock repurchase program under which the Company is authorized to repurchase up to $30 million of its common stock. As of December 28, 2013, the Company had repurchased 173,884 shares for approximately $6.9 million, at an average price of $39.88 per share. These shares were recorded as treasury stock. In addition, as of December 28, 2013, the Company had a commitment of approximately $0.5 million to purchase 12,214 shares, which were purchased before December 28, 2013, but settled after the end of the fiscal first quarter.

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ITEM 6.    Exhibits

31.1	Certification of Chief Executive Officer pursuant to Section 302(a) of the Sarbanes Oxley Act of 2002.
31.2	Certification of Chief Financial Officer pursuant to Section 302(a) of the Sarbanes Oxley Act of 2002.
32.1	Certification of the CEO pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of the CFO pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
99.1	Reconciliation of ROIC to GAAP Financial Statements
101	The following materials from Plexus Corp.’s Quarterly Report on Form 10-Q for the quarter ended December 28, 2013, formatted in XBRL (Extensible Business Reporting Language): (i) the Condensed Consolidated Statements of Comprehensive Income, (ii) the Condensed Consolidated Balance Sheets, (iii) the Condensed Consolidated Statements of Cash Flows, and (iv) Notes to Condensed Consolidated Financial Statements.
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document

26

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.

	Plexus Corp.
	Registrant
Date:1/31/14	/s/ Dean A. Foate
	Dean A. Foate
	Chairman, President and Chief Executive Officer
Date:1/31/14	/s/ Ginger M. Jones
	Ginger M. Jones
	Senior Vice President and Chief Financial Officer

27

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Dean A. Foate, certify that:

1. I have reviewed this quarterly report on Form 10-Q for the quarter ended December 28, 2013 of Plexus Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a 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 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-(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 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 the 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.

Date: January 31, 2014

/s/    Dean A. Foate        

Dean A. Foate

Chairman, President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Ginger M. Jones, certify that:

1. I have reviewed this quarterly report on Form 10-Q for the quarter ended December 28, 2013 of Plexus Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a 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 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-(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 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 the 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.

Date: January 31, 2014

/s/    Ginger M. Jones        

Ginger M. Jones

Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Plexus Corp. (the “Company”) on Form 10-Q for the quarterly period ended December 28, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Dean A. Foate, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) 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/    Dean A. Foate        

Dean A. Foate

Chairman, President and Chief Executive Officer

January 31, 2014

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 Plexus Corp. and will be retained by Plexus Corp. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Plexus Corp. (the “Company”) on Form 10-Q for the quarterly period ended December 28, 2013, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Ginger M. Jones, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) 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/    Ginger M. Jones        

Ginger M. Jones

Chief Financial Officer

January 31, 2014

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 Plexus Corp. and will be retained by Plexus Corp. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-99.1

Exhibit 99.1

PLEXUS CORP.

NON-GAAP SUUPLEMENTAL INFORMATION

(in thousands, except per share data)

(unaudited)

ROIC Calculation

	Three Months Ended				Twelve Months Ended				Three Months Ended
	December 28, 2013				September 28, 2013				December 29, 2012
Operating income	$	21,761							$	21,484
Restructuring charges	3,605								—
Adjusted operating income	$	25,366							$	21,484
	x		4						x		4
Annualized operating income	101,464				96,623				85,936
Tax rate	x		9	%	x		7	%	x		6	%
Tax impact			9,132				6,764				5,156
Operating income (tax effected)	$	92,332			$	89,859			$	80,780
Average invested capital	$	638,697			$	642,133			$	640,992
ROIC	14.5			%	14.0			%	12.6			%

	December 28,			September 28,			June 29,			March 30,			December 29,			September 29,
	2013			2013			2013			2013			2012			2012
Equity	$	722,021		$	699,301		$	679,539		$	669,047		$	664,515		$	649,022
Plus:
Debt—current	3,796			3,574			2,984			2,893			10,310			10,211
Debt—non-current	256,949			257,773			258,758			258,789			259,516			260,211
Less:
Cash and cash equivalents	(324,156		)	(341,865		)	(285,604		)	(276,507		)	(274,183		)	(297,619		)
	$	658,610		$	618,783		$	655,677		$	654,222		$	660,158		$	621,825

Fiscal 2014 first quarter average invested capital (December 28, 2013 and September 28, 2013) was $638,697.

Fiscal 2013 fourth quarter average invested capital (September 28, 2013, June 29, 2013, March 30, 2013, December 29, 2012 and September 29, 2012) was $642,133.

Fiscal 2013 first quarter average invested capital (December 29, 2012 and September 29, 2012) was $640,992.

XML

Business Segments (Schedule Of Financial Information About Company's Reportable Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Sep. 28, 2013
Segment Reporting Information [Line Items]
Net sales	$ 533,905	$ 530,532
Operating income (loss)	21,761	21,484
Interest expense	(2,815)	(3,720)
Interest income	639	397
Miscellaneous	240	(475)
Income before income taxes	19,825	17,686
Total assets	1,473,414		1,447,684
AMER [Member]
Segment Reporting Information [Line Items]
Net sales	265,009	259,024
Operating income (loss)	17,056	19,278
Total assets	436,872		423,048
APAC [Member]
Segment Reporting Information [Line Items]
Net sales	270,150	272,429
Operating income (loss)	31,942	25,200
Total assets	874,714		828,672
EMEA [Member]
Segment Reporting Information [Line Items]
Net sales	26,814	28,170
Operating income (loss)	(2,465)	(222)
Total assets	106,597		111,977
Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Net sales	(28,068)	(29,091)
Corporate [Member]
Segment Reporting Information [Line Items]
Operating income (loss)	(24,772)	(22,772)
Total assets	$ 55,231		$ 83,987

XML

Derivatives And Fair Value Measurements (Schedule Of Fair Values Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013
Interest Rate Swaps [Member]
Derivatives And Fair Value Measurements [Line Items]
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net	$ 135	$ 34
Forward Contracts [Member]
Derivatives And Fair Value Measurements [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure	135	0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Derivatives Designated As Hedging Instruments [Member] | Prepaid Expenses And Other [Member] | Forward Contracts [Member]
Derivatives And Fair Value Measurements [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure	0	0
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities - Other [Member] | Interest Rate Swaps [Member]
Derivatives And Fair Value Measurements [Line Items]
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net	0	0
Derivatives Designated As Hedging Instruments [Member] | Current Liabilities - Other [Member] | Forward Contracts [Member]
Derivatives And Fair Value Measurements [Line Items]
Derivative liabilities designated as hedging instruments, Fair Value	$ 1,491	$ 999

XML

Business Segments(Tables)

3 Months Ended

Dec. 28, 2013

Segment Reporting [Abstract]

Schedule Of Financial Information About Company's Reportable Segments

Information about the Company’s three reportable segments for the three months endedDecember 28, 2013 and December 29, 2012, respectively, follows (in thousands):

	Three Months Ended
	December 28, 2013			December 29, 2012
Net sales:
AMER	$	265,009		$	259,024
APAC	270,150			272,429
EMEA	26,814			28,170
Elimination of inter-segment sales	(28,068		)	(29,091		)
	$	533,905		$	530,532
Operating income (loss):
AMER	$	17,056		$	19,278
APAC	31,942			25,200
EMEA	(2,465		)	(222		)
Corporate and other costs	(24,772		)	(22,772		)
	$	21,761		$	21,484
Other income (expense):
Interest expense	$	(2,815	)	$	(3,720	)
Interest income	639			397
Miscellaneous	240			(475		)
Income before income taxes	$	19,825		$	17,686
	December 28, 2013			September 28, 2013
Total assets:
AMER	$	436,872		$	423,048
APAC	874,714			828,672
EMEA	106,597			111,977
Corporate	55,231			83,987
	$	1,473,414		$	1,447,684

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Restructuring Costs (Details) (USD $)	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 0
Restructuring Charges	3,605,000	0
Restructuring Reserve, Accrual Adjustment	(700,000)
Restructuring Reserve	2,900,000
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0
Restructuring Charges	300,000
Restructuring Reserve, Accrual Adjustment	0
Restructuring Reserve	300,000
Lease Agreements [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0
Restructuring Charges	1,800,000
Restructuring Reserve, Accrual Adjustment	0
Restructuring Reserve	1,800,000
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0
Restructuring Charges	1,500,000
Restructuring Reserve, Accrual Adjustment	(700,000)
Restructuring Reserve	$ 800,000

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Stock-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Share-based Compensation [Abstract]
Allocated Share-based Compensation Expense	$ 2.6	$ 2.8

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Debt

3 Months Ended

Dec. 28, 2013

Debt Instruments [Abstract]

Debt

DEBT

On May 15, 2012, the Company entered into a five-year, $250 million senior unsecured credit facility that terminates on May 15, 2017 (the “Credit Facility”). The Credit Facility includes a $160 million revolving credit facility and a $90 million term loan. The revolving credit facility may be increased by $100 million (the "increase option") to $260 million generally by mutual agreement of the Company, the lenders, the letter of credit issuers and the administrative agent named in the related credit agreement (the "Credit Agreement"), subject to certain customary conditions. Quarterly principal repayments of the term loan of $3.75 million per quarter began on June 29, 2012 and ended on March 28, 2013. The final $75 million payment is due on May 15, 2017. In the fiscal first quarter of 2014, the Company borrowed and repaid $45.0 million under the revolving credit facility. As of December 28, 2013, the Company had term loan borrowings of $75 million and no revolving borrowings outstanding under the Credit Facility.

The financial covenants (as defined under the Credit Agreement) require that the Company maintain, as of each fiscal quarter end, a maximum total leverage ratio and a minimum interest coverage ratio. As of December 28, 2013, the Company was in compliance with all financial covenants of the Credit Agreement. Borrowings under the Credit Facility, at the Company's option, bear interest at a defined base rate or the LIBOR rate plus, in each case, an applicable margin based upon the Company's leverage ratio as defined in the Credit Agreement. Rates would increase upon negative changes in specified Company financial metrics and would decrease to no less than LIBOR plus 1.00% or base rate plus 0% upon reduction in the current total leverage ratio. As of December 28, 2013, the Company had a borrowing rate of LIBOR plus 1.13%. As of December 28, 2013, all outstanding debt under the Credit Facility is at a fixed interest rate as a result of the interest rate swap contract discussed in Note 5, "Derivatives and Fair Value Measurements." There is no floating rate debt outstanding under the Credit Facility as of December 28, 2013. The Company is also required to pay an annual commitment fee on the unused revolver credit commitment based on the Company's leverage ratio; the fee was 0.2% as of December 28, 2013.

In the second quarter of fiscal 2012, the Company incurred approximately $0.9 million in new debt issuance costs in connection with the Credit Facility, which are being amortized over the five-year term of the Credit Facility.

The Company also has outstanding 5.20% Senior Notes, due on June 15, 2018 (the “Notes”); $175 million principal of the Notes was outstanding as of both December 28, 2013 and September 28, 2013. At December 28, 2013, the Company was in compliance with all financial covenants relating to the Notes, which are consistent with those in the Credit Agreement discussed above.

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Inventories (Schedule Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013
Inventory, Net [Abstract]
Raw materials	$ 310,643	$ 288,559
Work-in-process	63,494	57,883
Finished goods	66,345	57,578
Inventory, net	440,482	404,020
Customer Deposits Related to Inventory [Line Items]
Customer deposits related to inventory	42,000	51,600
Juniper Networks [Member]
Customer Deposits Related to Inventory [Line Items]
Customer deposits related to inventory	$ 11,000

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Basis Of Presentation And Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013 M	Sep. 28, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Liquid investments, maximum maturity period, months	3
Fair value of long-term debt	$ 247.2	$ 246.8
Long-term Debt	$ 250.0	$ 250.0

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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013
Property, Plant and Equipment, Net [Abstract]
Land, buildings and improvements	$ 267,611	$ 212,195
Machinery and equipment	315,223	312,941
Computer hardware and software	93,567	91,565
Construction in progress	27,183	67,518
Property, plant and equipment, gross	703,584	684,219
Less: accumulated depreciation	369,599	359,158
Property, plant and equipment, net	$ 333,985	$ 325,061

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Debt (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 28, 2013 Rate	May 15, 2012	May 15, 2012 New Credit Facility [Member]	Dec. 28, 2013 Revolving Loans New Credit Facility[Member]	May 15, 2012 Revolving Loans New Credit Facility[Member]	Dec. 28, 2013 Term Loans New Credit Facility [Member]	May 15, 2012 Term Loans New Credit Facility [Member]	May 15, 2012 Increase Option [Member]	Dec. 28, 2013 Senior Notes [Member]	Sep. 28, 2013 Senior Notes [Member]	Mar. 30, 2013 Senior Notes [Member]	Jan. 01, 2011 Senior Notes [Member] Rate
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 250		$ 160		$ 90
Credit facility outstanding at end of period				0		75.0
Contractual Quarterly Debt Repayment Amount		3.75
Contractual Balloon Debt Repayment		75
Line of Credit Facility, Maximum Borrowing Capacity					260			100
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum	1.00%
Debt Instrument, Interest Rate at Period End	1.13%
Line of Credit, Unused Capacity, Commitment Fee Percentage at Period End	0.20%
Deferred Finance Costs, Net		0.9
Debt Instrument, Interest Rate, Stated Percentage												5.20%
Senior Notes, principal outstanding									$ 175	$ 175	$ 175

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Property, Plant And Equipment

3 Months Ended

Dec. 28, 2013

Property, Plant and Equipment, Net [Abstract]

Property, Plant And Equipment

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consisted of the following categories (in thousands):

	December 28, 2013		September 28, 2013
Land, buildings and improvements	$	267,611	$	212,195
Machinery and equipment	315,223		312,941
Computer hardware and software	93,567		91,565
Construction in progress	27,183		67,518
	703,584		684,219
Less: accumulated depreciation	369,599		359,158
	$	333,985	$	325,061

The reduction in the construction in progress balance at December 28, 2013 was primarily due to the capitalization of assets related to the Neenah footprint expansion. The most significant component of the construction in progress balance at December 28, 2013 is related to footprint expansion in Guadalajara, Mexico. The major component of the construction in progress balance at September 28, 2013 was related to footprint expansion in Neenah.

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Derivatives And Fair Value Measurements (Narrative) (Details) (USD $)	3 Months Ended				3 Months Ended				3 Months Ended		12 Months Ended
	Dec. 28, 2013 Rate	Dec. 29, 2012	Jan. 01, 2011 Y	Jun. 28, 2008	Dec. 28, 2013 Forward Contracts [Member]	Dec. 29, 2012 Forward Contracts [Member]	Sep. 28, 2013 Forward Contracts [Member]	Apr. 08, 2011 Treasury Rate Lock Hedge Contracts [Member]	Dec. 28, 2013 Interest Rate Swaps [Member]	Dec. 29, 2012 Interest Rate Swaps [Member]	Sep. 28, 2013 Interest Rate Swaps [Member]	Jun. 28, 2008 Interest Rate Swaps [Member]	Jun. 28, 2008 First Interest Rate Swaps Contracts [Member] Rate	Jun. 28, 2008 Second Interest Rate Swaps Contracts [Member] Rate	Jun. 28, 2008 Third Interest Rate Swaps Contracts [Member] Rate	Dec. 28, 2013 Term Loans New Credit Facility [Member]	Dec. 28, 2013 Senior Notes [Member]	Sep. 28, 2013 Senior Notes [Member]	Mar. 30, 2013 Senior Notes [Member]	Dec. 28, 2013 MALAYSIA Forward Contracts [Member]	Dec. 28, 2013 CHINA Forward Contracts [Member]	Dec. 28, 2013 Current Liabilities - Other [Member] Derivatives Designated As Hedging Instruments [Member] Forward Contracts [Member]	Sep. 28, 2013 Current Liabilities - Other [Member] Derivatives Designated As Hedging Instruments [Member] Forward Contracts [Member]	Dec. 28, 2013 Current Liabilities - Other [Member] Derivatives Designated As Hedging Instruments [Member] Interest Rate Swaps [Member]	Sep. 28, 2013 Current Liabilities - Other [Member] Derivatives Designated As Hedging Instruments [Member] Interest Rate Swaps [Member]
Derivatives And Fair Value Measurements [Line Items]
Derivative, Notional Amount									$ 75,000,000			$ 150,000,000								$ 60,000,000	$ 25,000,000
Derivative, Gain (Loss) on Derivative, Net					135,000
Derivative Liability, Fair Value, Gross Liability																						1,491,000	999,000
Foreign Currency Contract, Asset, Fair Value Disclosure					135,000		0
Senior Notes																	175,000,000	175,000,000	175,000,000
Credit facility outstanding at end of period																75,000,000
Proceeds from settlement of treasury rate lock contracts								2,300,000
Amortization period of treasury rate lock settlement, years			7
Fixed interest rate	0.875%												4.415%	4.49%	4.435%
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)											2,031,000
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0	0			(743,000)	79,000			(31,000)	(805,000)
Conversion of variable rate term loan into fixed rate debt				150,000,000
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net									(135,000)		(34,000)													0	0
Interest Rate Cash Flow Hedge Liability at Fair Value										$ 1,700,000

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Guarantees (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 28, 2013	Sep. 28, 2013
Product Warranty [Line Items]
Limited warranty liability, beginning balance	$ 5,942	$ 5,145
Accruals for warranties issued during the period	387	1,168
Settlements (in cash or in kind) during the period	(260)	(371)
Limited warranty liability, ending balance	$ 6,069	$ 5,942
Minimum [Member]
Product Warranty [Line Items]
Products warranty specifications period, months	12
Maximum [Member]
Product Warranty [Line Items]
Products warranty specifications period, months	24

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Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Income Statement [Abstract]
Revenue, Net	$ 533,905	$ 530,532
Cost of sales	(482,403)	(479,370)
Gross profit	51,502	51,162
Selling and administrative expenses	26,136	29,678
Restructuring Charges	3,605	0
Operating income	21,761	21,484
Other income (expense):
Interest expense	(2,815)	(3,720)
Interest income	639	397
Miscellaneous	240	(475)
Income before income taxes	19,825	17,686
Income tax expense	2,162	1,070
Net income	17,663	16,616
Earnings per share:
Basic	$ 0.52	$ 0.48
Diluted	$ 0.51	$ 0.47
Weighted average shares outstanding:
Basic	33,730	34,836
Diluted	34,693	35,283
Comprehensive income:
Net income	17,663	16,616
Derivative instrument fair market value adjustment - net of income tax	(523)	(511)
Foreign currency translation adjustments	2,421	2,625
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	1,898	2,114
Comprehensive income	$ 19,561	$ 18,730

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Basis Of Presentation And Accounting Policies

3 Months Ended

Dec. 28, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis Of Presentation And Accounting Policies

BASIS OF PRESENTATION AND ACCOUNTING POLICIES

Basis of Presentation

The accompanying condensed consolidated financial statements included herein have been prepared by Plexus Corp. and its subsidiaries (together “Plexus” or the “Company”) without audit and pursuant to the rules and regulations of the United States (“U.S.”) Securities and Exchange Commission (“SEC”). In the opinion of the Company, the accompanying condensed consolidated financial statements reflect all adjustments, which include normal recurring adjustments necessary for the fair statement of the consolidated financial position of the Company as of December 28, 2013 and September 28, 2013, and the results of operations for the three months endedDecember 28, 2013 and December 29, 2012, and the cash flows for the same three month periods.

Certain information and footnote disclosures, normally included in financial statements prepared in accordance with generally accepted accounting principles, have been condensed or omitted pursuant to the SEC’s rules and regulations dealing with interim financial statements. However, the Company believes that the disclosures made in the condensed consolidated financial statements included herein are adequate to make the information presented not misleading. It is suggested that these condensed consolidated financial statements be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2013 Annual Report on Form 10-K.

The Company’s reportable segments consist of the “Americas” (“AMER”) segment, “Asia-Pacific” (“APAC”) segment and “Europe, Middle East, and Africa” (“EMEA”) segment. Refer to Note 9, "Business Segments," for further details on reportable segments.

Cash and Cash Equivalents

Cash and cash equivalents include highly liquid investments with original maturities of three months or less at the time of purchase and are classified as Level 1 in the fair level hierarchy described below.

Fair Value of Financial Instruments

The Company holds financial instruments consisting of cash and cash equivalents, accounts receivable, accounts payable, debt, derivatives, and capital lease obligations. The carrying values of cash and cash equivalents, accounts receivable, accounts payable, derivatives, and capital lease obligations as reported in the condensed consolidated financial statements approximate fair value. Accounts receivable were reflected at net realizable value based on anticipated losses due to potentially uncollectible balances. Anticipated losses were based on management’s analysis of historical losses and changes in customers’ credit status. The fair value of the Company’s long-term debt was $247.2 million and $246.8 million as of December 28, 2013 and September 28, 2013, respectively. The carrying value of the Company’s long-term debt was $250.0 million for both the periods ended December 28, 2013 and September 28, 2013. The Company uses quoted market prices when available or discounted cash flows to calculate the fair value of its debt. If measured at fair value in the financial statements, long-term debt (including the current portion) would be classified as Level 2 in the fair value hierarchy described below. Refer to Note 5, "Derivatives and Fair Value Measurements," for further details on derivatives.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (or exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting guidance establishes a fair value hierarchy based on three levels of inputs that may be used to measure fair value. The input levels are:

Level 1: Quoted (observable) market prices in active markets for identical assets or liabilities.

Level 2: Inputs other than Level 1 that are observable, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.

Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the asset or liability.

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Derivatives And Fair Value Measurements (Schedule Of Fair Value Measurements Using Input Levels Asset/(Liability)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013
Fair Value, Inputs, Level 2 [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	$ 135
Interest Rate Swaps [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	135
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	0
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 3 [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	0
Foreign Currency Forward Contracts [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	(1,491)
Foreign Currency Forward Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	0
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Foreign Currency Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	(1,491)
Foreign Currency Forward Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Derivatives And Fair Value Measurements [Line Items]
Fair value of derivative, net	0
Foreign Currency Contract, Asset, Fair Value Disclosure	0
Forward Contracts [Member]
Derivatives And Fair Value Measurements [Line Items]
Foreign Currency Contract, Asset, Fair Value Disclosure	$ 135	$ 0

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Property, Plant And Equipment (Tables)

3 Months Ended

Dec. 28, 2013

Property, Plant and Equipment, Net [Abstract]

Schedule Of Property, Plant And Equipment

Property, plant and equipment consisted of the following categories (in thousands):

	December 28, 2013		September 28, 2013
Land, buildings and improvements	$	267,611	$	212,195
Machinery and equipment	315,223		312,941
Computer hardware and software	93,567		91,565
Construction in progress	27,183		67,518
	703,584		684,219
Less: accumulated depreciation	369,599		359,158
	$	333,985	$	325,061

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Earnings Per Share (Schedule Of Reconciliation Of Amounts Utilized In Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Earnings Per Share [Line Items]
Net income	$ 17,663	$ 16,616
Basic weighted average common shares outstanding	33,730	34,836
Dilutive effect of share-based awards outstanding	963	447
Diluted weighted average shares outstanding	34,693	35,283
Earnings per share, Basic	$ 0.52	$ 0.48
Earnings per share, Diluted	$ 0.51	$ 0.47
Stock Options [Member]
Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of diluted earnings per share	500	2,100

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Earnings Per Share (Tables)

3 Months Ended

Dec. 28, 2013

Earnings Per Share [Abstract]

Schedule Of Reconciliation Of Amounts Utilized In Computation Of Basic And Diluted Earnings Per Share

The following is a reconciliation of the amounts utilized in the computation of basic and diluted earnings per share (in thousands, except per share amounts):

	Three Months Ended
	December 28, 2013		December 29, 2012
Basic and Diluted Earnings Per Share:
Net income	$	17,663	$	16,616
Basic weighted average common shares outstanding	33,730		34,836
Dilutive effect of share-based awards outstanding	963		447
Diluted weighted average shares outstanding	34,693		35,283
Earnings per share:
Basic	$	0.52	$	0.48
Diluted	$	0.51	$	0.47

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Inventories

3 Months Ended

Dec. 28, 2013

Inventory, Net [Abstract]

Inventories

INVENTORIES

Inventories are stated at the lower of cost (on a first-in, first-out basis) or market value. The stated cost is comprised of direct materials, labor, and overhead. The major classes of inventories, net of applicable lower of cost or market write-downs, were as follows (in thousands):

	December 28, 2013		September 28, 2013
Raw materials	$	310,643	$	288,559
Work-in-process	63,494		57,883
Finished goods	66,345		57,578
	$	440,482	$	404,020

Per contractual terms, customer deposits are received by the Company to offset obsolete and excess inventory risks. The total amount of customer deposits related to inventory and included within current liabilities on the accompanying Condensed Consolidated Balance Sheets as of December 28, 2013 and September 28, 2013 was $42.0 million and $51.6 million, respectively. The decrease in the customer deposits balance is primarily related to the return of $11.0 million of inventory related deposits to Juniper Networks, Inc. ("Juniper") in the first fiscal quarter of 2014.

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Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013
Current assets:
Cash and cash equivalents	$ 324,156	$ 341,865
Accounts receivable, net of allowances of $1,204 and $1,008, respectively	300,275	305,350
Inventories	440,482	404,020
Deferred income taxes	3,933	3,917
Prepaid expenses and other	24,164	23,870
Total current assets	1,093,010	1,079,022
Property, plant and equipment, net	333,985	325,061
Deferred income taxes	2,482	2,510
Other	43,937	41,091
Total assets	1,473,414	1,447,684
Current liabilities:
Current portion of long-term debt and capital lease obligations	3,796	3,574
Accounts payable	337,300	313,404
Customer deposits	45,496	69,295
Accrued liabilities:
Salaries and wages	37,759	42,553
Other	50,630	42,550
Total current liabilities	474,981	471,376
Long-term debt and capital lease obligations, net of current portion	256,949	257,773
Deferred Tax Liabilities, Net, Noncurrent	2,128	2,128
Other liabilities	17,335	17,106
Total non-current liabilities	276,412	277,007
Liabilities	751,393	748,383
Shareholders' equity:
Preferred stock, $.01 par value, 5,000 shares authorized, none issued or outstanding	0	0
Common stock, $.01 par value, 200,000 shares authorized, 49,549 and 49,176 shares issued, respectively, and 33,787 and 33,600 shares outstanding, respectively	495	492
Additional paid-in capital	459,458	449,368
Common stock held in treasury, at cost, 15,762 and 15,576 shares, respectively	(456,902)	(449,968)
Retained earnings	696,835	679,172
Accumulated other comprehensive income	22,135	20,237
Total shareholders’ equity	722,021	699,301
Liabilities and Equity	$ 1,473,414	$ 1,447,684

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Shareholders' Equity

3 Months Ended

Dec. 28, 2013

Stockholders' Equity Note [Abstract]

Shareholders' Equity

SHAREHOLDERS' EQUITY

On August 19, 2013, the Board of Directors approved a stock repurchase program under which the Company is authorized to repurchase up to $30 million of its common stock. During the three months endedDecember 28, 2013, the Company repurchased 173,884 shares for approximately $6.9 million, at an average price of $39.88 per share. These shares were recorded as treasury stock. In addition, as of December 28, 2013, the Company had a commitment of approximately $0.5 million to purchase 12,214 shares, which were purchased before December 28, 2013, but settled after the end of the fiscal first quarter.

On October 23, 2012, the Board of Directors approved a stock repurchase program under which the Company was authorized to repurchase up to $50 million of its common stock. During the three months ended December 29, 2012, the Company repurchased 262,422 shares for approximately $6.1 million, at an average price of $23.13 per share. The Company repurchased 1,821,698 shares under this program in fiscal 2013 for approximately $49.9 million, at an average price of $27.37 per share. These shares were recorded as treasury stock.

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Document And Entity Information	3 Months Ended
	Dec. 28, 2013	Jan. 27, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 28, 2013
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Entity Registrant Name	PLEXUS CORP
Entity Central Index Key	0000785786
Current Fiscal Year End Date	--09-27
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,934,291

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Restructuring Costs (Notes)

3 Months Ended

Dec. 28, 2013

Restructuring and Related Activities [Abstract]

Restructuring and Related Activities Disclosure [Text Block]

RESTRUCTURING COSTS

For the three months ended December 28, 2013, the Company incurred restructuring costs of $3.6 million, which consisted of the following:

• $1.5 million of rent and associated costs resulting from the early exit of operating leases for two existing Neenah, Wisconsin facilities;

• $1.8 million of moving costs to consolidate two existing Neenah, Wisconsin and one existing Appleton, Wisconsin (being sometimes referred to as the "Fox Cities") facilities into the new Neenah, Wisconsin manufacturing facility; and

• $0.3 million of severance from the reduction of the Company's workforce in the Fox Cities, Wisconsin and in the United Kingdom.

The Company's restructuring cost accrual activity for the three months ended December 28, 2013 is included in the table below:

	Employee
	Termination				Other
	and Severance		Lease		Exit
	Costs		Obligations		Costs			Total
Accrual balance, September 28, 2013	$	—	$	—	$	—		$	—
Restructuring costs	0.3		1.8		1.5			3.6
Amounts utilized	—		—		(0.7		)	(0.7		)
Accrual balance, December 28, 2013	$	0.3	$	1.8	$	0.8		$	2.9

The accrual balance is expected to be utilized in the remainder of fiscal 2014.

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Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 28, 2013	Sep. 28, 2013
Statement of Financial Position [Abstract]
Accounts receivable, allowances	$ 1,204	$ 1,008
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	49,549,000	49,176,000
Common stock, shares outstanding	33,787,000	33,600,000
Treasury stock, shares	15,762,000	15,576,000

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Stock-Based Compensation

3 Months Ended

Dec. 28, 2013

Share-based Compensation [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

The Company recognized $2.6 million and $2.8 million of compensation expense associated with stock-based awards for the three months endedDecember 28, 2013 and December 29, 2012, respectively.

The Company uses the Black-Scholes valuation model to determine the fair value of stock options and stock-settled SARs. The Company uses the fair value at the date of grant to value restricted stock units ("RSUs") and unrestricted stock awards. The Company recognizes stock-based compensation expense over the stock-based awards’ vesting period.

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Earnings Per Share

3 Months Ended

Dec. 28, 2013

Earnings Per Share [Abstract]

Earnings Per Share

EARNINGS PER SHARE

The following is a reconciliation of the amounts utilized in the computation of basic and diluted earnings per share (in thousands, except per share amounts):

	Three Months Ended
	December 28, 2013		December 29, 2012
Basic and Diluted Earnings Per Share:
Net income	$	17,663	$	16,616
Basic weighted average common shares outstanding	33,730		34,836
Dilutive effect of share-based awards outstanding	963		447
Diluted weighted average shares outstanding	34,693		35,283
Earnings per share:
Basic	$	0.52	$	0.48
Diluted	$	0.51	$	0.47

For the three months endedDecember 28, 2013 and December 29, 2012, stock options and stock-settled SARs for approximately 0.5 million and 2.1 million shares, respectively, were not included in the computation of diluted earnings per share because the options' and stock-settled SARs' exercise prices were greater than the average market price of the Company's common shares and, therefore, their effect would be anti-dilutive.

As a result of the Company's stock repurchase programs, there were fewer shares outstanding for the three months endedDecember 28, 2013 as compared to the three months endedDecember 29, 2012. Refer to Note 12, "Shareholders' Equity" for further information on the Company's stock repurchase programs.

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Derivatives And Fair Value Measurements (Tables)

3 Months Ended

Dec. 28, 2013

Derivatives And Fair Value Measurements [Abstract]

Schedule Of Fair Values Of Derivative Instruments

Fair Values of Derivative Instruments
In thousands of dollars
	Asset Derivatives					Liability Derivatives
		December 28, 2013		September 28, 2013			December 28, 2013		September 28, 2013
Derivatives designated as hedging instruments	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
Interest rate swaps	Prepaid expenses and other	$	135	$	34	Current liabilities – other	$	—	$	—
Forward contracts	Prepaid expenses and other	$	—	$	—	Current liabilities – other	$	1,491	$	999

Fair Values of Derivative Instruments
In thousands of dollars
	Asset Derivatives					Liability Derivatives
		December 28, 2013		September 28, 2013			December 28, 2013		September 28, 2013
Derivatives not designated as hedging instruments	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
Forward contracts	Prepaid expenses and other	$	135	$	—	Current liabilities – other	$	—	$	—

Schedule Of The Effect Of Derivative Instruments On The Condensed Statements Of Operations

The Effect of Derivative Instruments on the Condensed Statements of Comprehensive Income
for the Three Months Ended
In thousands of dollars
Derivatives in Cash Flow Hedging Relationships	Amount of Gain or (Loss) Recognized in Other Comprehensive Income (“OCI”) on Derivative (Effective Portion)						Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	December 28, 2013			December 29, 2012				December 28, 2013			December 29, 2012				December 28, 2013		December 29, 2012
Interest rate swaps	$	(31	)	$	(805	)	Interest income (expense)	$	(132	)	$	(786	)	Other income (expense)	$	—	$	—
Forward contracts	$	(743	)	$	79		Selling and administrative expenses	$	(250	)	$	493		Other income (expense)	$	—	$	—
Treasury rate locks	$	—		$	—		Interest income (expense)	$	79		$	79		Other income (expense)	$	—	$	—
Income tax (benefit) expense	$	—		$	—		Income tax (benefit) expense	$	52		$	—		Income tax (benefit) expense	$	—	$	—

Schedule Of Fair Value Measurements Using Input Levels Asset/(Liability)

The following table lists the fair values of assets/(liabilities) of the Company’s derivatives as of December 28, 2013, by input level as defined above (in thousands):

Derivatives	Level 1		Level 2			Level 3		Total
Interest rate swaps	$	—	$	135		$	—	$	135
Foreign currency forward contracts - designated as hedging instruments	$	—	$	(1,491	)	$	—	$	(1,491	)
Foreign currency forward contracts - not designated as hedging instruments	$	—	$	135		$	—	$	135

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New Accounting Pronouncements

3 Months Ended

Dec. 28, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements

NEW ACCOUNTING PRONOUNCEMENTS

In July 2013, the Financial Accounting Standards Board (“FASB”) issued new guidance for unrecognized tax benefits that exist along with a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The guidance requires an entity to present an unrecognized tax benefit as a reduction of a deferred tax asset for an net operating loss ("NOL") carryforward, or similar tax loss or tax credit carryforward, rather than as a liability when (1) the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and (2) the entity intends to use the deferred tax asset for that purpose. This guidance is effective prospectively for fiscal years, and interim periods within those years, beginning after December 15, 2013. Early adoption and retrospective application are permitted. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements.

In July 2013, the FASB issued amended guidance that permits the Fed Funds Effective Swap Rate (also referred to as the Overnight Index Swap Rate, or "OIS") to be used as a U.S. benchmark interest rate for hedge accounting purposes, in addition to Treasury obligations of the U.S. government ("UST") and the London Interbank Offered Rate ("LIBOR"). The amendments also remove the restriction on using different benchmark rates for similar hedges. This update is effective prospectively for qualifying new or redesignated hedging relationships entered into on or after July 17, 2013. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements or results of operations.

In March 2013, the FASB issued amended guidance for cumulative translation adjustments upon derecognition of certain subsidiaries or groups of assets within a foreign entity or of an investment in a foreign entity. These amendments provide guidance on releasing cumulative translation adjustments when a reporting entity ceases to have a controlling financial interest in a subsidiary or group of assets that is a nonprofit activity or a business within a foreign entity.  In addition, these amendments provide guidance on the release of cumulative translation adjustment in partial sales of equity method investments and in step acquisitions.  The amendments are effective on a prospective basis for fiscal years and interim reporting periods within those years, beginning after December 15, 2013. Early adoption is permitted. The adoption of this guidance is not expected to have a material impact on the Company's consolidated financial statements.

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Guarantees

3 Months Ended

Dec. 28, 2013

Guarantees [Abstract]

Guarantees

GUARANTEES

The Company offers certain indemnifications under its customer manufacturing agreements. In the normal course of business, the Company may from time to time be obligated to indemnify its customers or its customers’ customers against damages or liabilities arising out of the Company’s negligence, misconduct, breach of contract, or infringement of third party intellectual property rights. Certain agreements have extended broader indemnification, and while most agreements have contractual limits, some do not. However, the Company generally does not provide for such indemnities and seeks indemnification from its customers for damages or liabilities arising out of the Company’s adherence to customers’ specifications or designs or use of materials furnished, or directed to be used, by its customers. The Company does not believe its obligations under such indemnities are material.

In the normal course of business, the Company also provides its customers a limited warranty covering workmanship, and in some cases materials, on products manufactured by the Company. Such warranty generally provides that products will be free from defects in the Company’s workmanship and meet mutually agreed-upon specifications for periods generally ranging from 12 months to 24 months. If a product fails to comply with the Company’s limited warranty, the Company’s obligation is generally limited to correcting, at its expense, any defect by repairing or replacing such defective product. The Company’s warranty generally excludes defects resulting from faulty customer-supplied components, design defects or damage caused by any party or cause other than the Company.

The Company provides for an estimate of costs that may be incurred under its limited warranty at the time product revenue is recognized and establishes additional reserves for specifically identified product issues. These costs primarily include labor and materials, as necessary, associated with repair or replacement and are included in the Company’s accompanying Condensed Consolidated Balance Sheets in other current accrued liabilities. The primary factors that affect the Company’s warranty liability include the value and the number of shipped units and historical and anticipated rates of warranty claims. As these factors are impacted by actual experience and future expectations, the Company assesses the adequacy of its recorded warranty liabilities and adjusts the amounts as necessary.

Below is a table summarizing the activity related to the Company’s limited warranty liability for fiscal 2013 and for the three months endedDecember 28, 2013 (in thousands):

Limited warranty liability, as of September 29, 2012	$	5,145
Accruals for warranties issued during the period	1,168
Settlements (in cash or in kind) during the period	(371		)
Limited warranty liability, as of September 28, 2013	5,942
Accruals for warranties issued during the period	387
Settlements (in cash or in kind) during the period	(260		)
Limited warranty liability, as of December 28, 2013	$	6,069

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Income Taxes

3 Months Ended

Dec. 28, 2013

Income Tax Expense (Benefit), Continuing Operations [Abstract]

Income Taxes

INCOME TAXES

Income tax expense for the three months endedDecember 28, 2013 and December 29, 2012 was $2.2 million and $1.1 million, respectively. The effective tax rates for the three months endedDecember 28, 2013 and December 29, 2012 were 11 percent and 6 percent, respectively. The increase in the effective tax rate for the three months endedDecember 28, 2013, compared to the effective tax rate for the prior year period, was primarily due to an increase in income in China. A tax holiday reducing the tax rate for an entity in China expired on December 31, 2013. The Company anticipates the end of this holiday will have a negligible impact to the annualized effective tax rate for fiscal 2014. As demonstrated in recent quarters, the Company's overall tax rate will vary during the year based on the mix of forecasted earnings by taxing jurisdiction.

As of December 28, 2013, there was no material change in the amount of unrecognized tax benefits recorded for uncertain tax positions as compared to fiscal 2013 year end. The Company recognizes accrued interest and penalties related to uncertain tax positions in income tax expense. The amount of interest and penalties recorded for both the three months endedDecember 28, 2013 and December 29, 2012 was not material.

It is reasonably possible that a number of uncertain tax positions related to federal and state tax positions may be settled within the next 12 months. The Company is currently under examination by taxing authorities in the U.S.; however, the Company is not currently under examination in any of the foreign jurisdictions in which the Company has significant operations.

The Company maintains valuation allowances when it is more likely than not that all or a portion of a deferred tax asset will not be realized. During the three months endedDecember 28, 2013, the Company continued to record a full valuation allowance against its net deferred tax assets in the U.S., Germany, Romania and the U.K., as it is more likely than not that these assets will not be fully realized based primarily on historical performance. The Company will continue to provide a valuation allowance against its net deferred tax assets in each of the applicable jurisdictions going forward until the need for a valuation allowance is eliminated. The need for a valuation allowance will be eliminated when the Company determines it is more likely than not that the deferred tax assets will be realized.

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Business Segments

3 Months Ended

Dec. 28, 2013

Segment Reporting [Abstract]

Business Segments

BUSINESS SEGMENTS

Reportable segments are defined as components of an enterprise about which separate financial information is available that is evaluated regularly by the chief operating decision maker, or group, in assessing performance and allocating resources.

The Company uses an internal management reporting system, which provides important financial data to evaluate performance and allocate the Company’s resources on a regional basis. Net sales for segments are attributed to the region in which the product is manufactured or service is performed. The services provided, manufacturing processes used, class of customers serviced and order fulfillment processes used are similar and generally interchangeable across the segments. A segment’s performance is evaluated based upon its operating income (loss). A segment’s operating income (loss) includes its net sales less cost of sales and selling and administrative expenses, but excludes corporate and other costs, interest expense, other income (loss), and income taxes. Corporate and other costs primarily represent corporate selling and administrative expenses, and restructuring and impairment costs, if any. These costs are not allocated to the segments, as management excludes such costs when assessing the performance of the segments. Inter-segment transactions are generally recorded at amounts that approximate arm’s length transactions. The accounting policies for the regions are the same as for the Company taken as a whole.

Information about the Company’s three reportable segments for the three months endedDecember 28, 2013 and December 29, 2012, respectively, follows (in thousands):

	Three Months Ended
	December 28, 2013			December 29, 2012
Net sales:
AMER	$	265,009		$	259,024
APAC	270,150			272,429
EMEA	26,814			28,170
Elimination of inter-segment sales	(28,068		)	(29,091		)
	$	533,905		$	530,532
Operating income (loss):
AMER	$	17,056		$	19,278
APAC	31,942			25,200
EMEA	(2,465		)	(222		)
Corporate and other costs	(24,772		)	(22,772		)
	$	21,761		$	21,484
Other income (expense):
Interest expense	$	(2,815	)	$	(3,720	)
Interest income	639			397
Miscellaneous	240			(475		)
Income before income taxes	$	19,825		$	17,686
	December 28, 2013			September 28, 2013
Total assets:
AMER	$	436,872		$	423,048
APAC	874,714			828,672
EMEA	106,597			111,977
Corporate	55,231			83,987
	$	1,473,414		$	1,447,684

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Litigation

3 Months Ended

Dec. 28, 2013

Litigation [Abstract]

Litigation [Text Block]

LITIGATION

The Company is party to lawsuits in the ordinary course of business. Management does not believe that these proceedings, individually or in the aggregate, will have a material positive or adverse effect on the Company’s consolidated financial position, results of operations or cash flows.

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Derivatives And Fair Value Measurements (Schedule Of The Effect Of Derivative Instruments On The Condensed Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Sep. 28, 2013
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative (Effective Portion)	$ 0	$ 0
Interest Rate Swap [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative (Effective Portion)	(31)	(805)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			2,031
Forward Contracts [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative (Effective Portion)	(743)	79
Treasury Rate Locks [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Recognized in Other Comprehensive Income (OCI) on Derivative (Effective Portion)	0	0
Interest Expense [Member] | Interest Rate Swap [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(132)	(786)
Interest Income [Member] | Treasury Rate Locks [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	79	79
General and Administrative Expense [Member] | Foreign Exchange Forward [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(250)	493
Income Tax (Benefit) Expense [Member]
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ 52

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Inventories (Tables)

3 Months Ended

Dec. 28, 2013

Inventory, Net [Abstract]

Schedule Of Inventories

The major classes of inventories, net of applicable lower of cost or market write-downs, were as follows (in thousands):

	December 28, 2013		September 28, 2013
Raw materials	$	310,643	$	288,559
Work-in-process	63,494		57,883
Finished goods	66,345		57,578
	$	440,482	$	404,020

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Guarantees (Tables)

3 Months Ended

Dec. 28, 2013

Guarantees [Abstract]

Schedule Of Limited Warranty Liability

Below is a table summarizing the activity related to the Company’s limited warranty liability for fiscal 2013 and for the three months endedDecember 28, 2013 (in thousands):

Limited warranty liability, as of September 29, 2012	$	5,145
Accruals for warranties issued during the period	1,168
Settlements (in cash or in kind) during the period	(371		)
Limited warranty liability, as of September 28, 2013	5,942
Accruals for warranties issued during the period	387
Settlements (in cash or in kind) during the period	(260		)
Limited warranty liability, as of December 28, 2013	$	6,069

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Shareholders' Equity (Details) (USD $)	0 Months Ended		3 Months Ended		12 Months Ended
	Aug. 19, 2013	Oct. 23, 2012	Dec. 28, 2013	Dec. 29, 2012	Sep. 28, 2013
Stockholders' Equity Note [Abstract]
Stock Repurchase Program, Authorized Amount	$ 30,000,000	$ 50,000,000
Stock Repurchased During Period, Shares			173,884	262,422	1,821,698
Cost of shares repurchased			6,934,000	6,070,000	49,900,000
Average price of repurchased shares			$ 39.88	$ 23.13	$ 27.37
Committed Payments for Repurchase of Common Stock			$ 500,000
Shares of Common Stock Committed to Purchase			12,214

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Condensed Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Cash flows from operating activities
Net income	$ 17,663	$ 16,616
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation	11,470	11,957
Amortization of intangibles	516	516
Gain on sale of property, plant and equipment	(72)	(69)
Deferred income taxes	(7)	66
Stock based compensation expense	2,558	2,785
Changes in operating assets and liabilities, excluding effects of acquisitions
Accounts receivable	5,891	33,365
Inventories	(35,587)	(22,814)
Prepaid expenses and other	(3,547)	(3,047)
Accounts payable	29,273	(22,478)
Customer deposits	(23,960)	(48)
Accrued liabilities and other	(527)	(8,342)
Cash flows provided by operating activities	3,671	8,507
Cash flows from investing activities
Payments for property, plant and equipment	(21,795)	(25,843)
Proceeds from sales of property, plant and equipment	113	82
Cash flows used in investing activities	(21,682)	(25,761)
Cash flows from financing activities
Proceeds from revolving credit facility	45,000	0
Payments on revolving credit facility, debt and capital lease obligations	(46,016)	(648)
Repurchases of common stock	(6,934)	(6,070)
Proceeds from exercise of stock options	7,535	48
Cash flows used in financing activities	(415)	(6,670)
Effect of exchange rate changes on cash and cash equivalents	717	488
Net decrease in cash and cash equivalents	(17,709)	(23,436)
Cash and cash equivalents:
Beginning of period	341,865	297,619
End of period	$ 324,156	$ 274,183

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Derivatives And Fair Value Measurements

3 Months Ended

Dec. 28, 2013

Derivatives And Fair Value Measurements [Abstract]

Derivatives And Fair Value Measurements

DERIVATIVES AND FAIR VALUE MEASUREMENTS

All derivatives are recognized in the accompanying Condensed Consolidated Balance Sheets at their estimated fair value. The Company uses derivatives to manage the variability of foreign currency obligations and interest rates. The Company has cash flow hedges related to variable rate debt and forecasted foreign currency obligations, in addition to fair value hedges to manage foreign currency exposures associated with certain foreign currency denominated assets and liabilities. The Company does not enter into derivatives for speculative purposes. Changes in the fair value of the derivatives that qualify as cash flow hedges are recorded in “Accumulated other comprehensive income” in the accompanying Condensed Consolidated Balance Sheets until earnings are affected by the variability of the cash flows.

The Company enters into forward currency exchange contracts on a rolling basis. The Company had cash flow hedges outstanding with a notional value of $60.0 million as of December 28, 2013. These forward currency contracts fix the exchange rates for the settlement of future foreign currency obligations that have yet to be realized. The total fair value of the cash flow hedges was a $1.5 millionliability as of December 28, 2013 and a $1.0 million liability as of September 28, 2013.

In addition, the Company had fair value derivatives outstanding with a notional value of $25.0 million as of December 28, 2013. The Company has not designated these derivative instruments as hedging instruments. The net settlement amount (fair value) related to these contracts is recorded on the Condensed Consolidated Balance Sheets as either a current or long-term asset or liability and as an element of other (income) expense. The total fair value of these derivatives was a $0.1 millionasset as of December 28, 2013. No contracts were outstanding as of September 28, 2013.

On June 4, 2013, the Company entered into an interest rate swap contract to replace the three interest rate swap contracts that matured on April 4, 2013, as described below. The new interest rate swap contract is related to the $75.0 million term loan under the Credit Facility. This interest rate swap pays the Company variable interest at the one month LIBOR rate, and the Company pays the counterparty a fixed interest rate. The fixed interest rate for the contract is 0.875%. Based on the terms of the interest rate swap contract and the underlying debt, the interest rate contract was determined to be effective, and thus qualifies as a cash flow hedge. As such, any changes in the fair value of the interest rate swap are recorded in “Accumulated other comprehensive income” on the accompanying Condensed Consolidated Balance Sheets until earnings are affected by the variability of cash flows. The total fair value of the interest rate swap contract was a $0.1 million asset as of December 28, 2013 and a $0.03 million asset as of September 28, 2013. The notional amount of the Company’s interest rate swap was $75.0 million as of December 28, 2013 and September 28, 2013.

The Company previously entered into three interest rate swap contracts related to the term loans under its prior credit facility that had an initial total notional value of $150 million and matured on April 4, 2013, which resulted in a $2.0 million discrete tax benefit in the three months ended June 29, 2013. The fixed interest rates for each of these contracts were 4.415%, 4.490% and 4.435%, respectively. These interest rate swap contracts were originally entered into to convert $150 million of the variable rate term loan under the prior credit facility into fixed rate debt. Based on the terms of the interest rate swap contracts and the underlying debt, these interest rate contracts were determined to be effective, and thus qualified as a cash flow hedge. As such, any changes in the fair value of these interest rate swaps were recorded in “Accumulated other comprehensive income” on the accompanying Condensed Consolidated Balance Sheets until earnings were affected by the variability of cash flows. The total fair value of these interest rate swap contracts was a $1.7 million liability as of December 29, 2012.

The tables below present information regarding the fair values of derivative instruments (as defined in Note 1, "Basis of Presentation and Accounting Policies") and the effects of derivative instruments on the Company’s Condensed Consolidated Financial Statements:

Fair Values of Derivative Instruments
In thousands of dollars
	Asset Derivatives					Liability Derivatives
		December 28, 2013		September 28, 2013			December 28, 2013		September 28, 2013
Derivatives designated as hedging instruments	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
Interest rate swaps	Prepaid expenses and other	$	135	$	34	Current liabilities – other	$	—	$	—
Forward contracts	Prepaid expenses and other	$	—	$	—	Current liabilities – other	$	1,491	$	999

Fair Values of Derivative Instruments
In thousands of dollars
	Asset Derivatives					Liability Derivatives
		December 28, 2013		September 28, 2013			December 28, 2013		September 28, 2013
Derivatives not designated as hedging instruments	Balance Sheet Location	Fair Value		Fair Value		Balance Sheet Location	Fair Value		Fair Value
Forward contracts	Prepaid expenses and other	$	135	$	—	Current liabilities – other	$	—	$	—

The Effect of Derivative Instruments on the Condensed Statements of Comprehensive Income
for the Three Months Ended
In thousands of dollars
Derivatives in Cash Flow Hedging Relationships	Amount of Gain or (Loss) Recognized in Other Comprehensive Income (“OCI”) on Derivative (Effective Portion)						Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)						Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing)
	December 28, 2013			December 29, 2012				December 28, 2013			December 29, 2012				December 28, 2013		December 29, 2012
Interest rate swaps	$	(31	)	$	(805	)	Interest income (expense)	$	(132	)	$	(786	)	Other income (expense)	$	—	$	—
Forward contracts	$	(743	)	$	79		Selling and administrative expenses	$	(250	)	$	493		Other income (expense)	$	—	$	—
Treasury rate locks	$	—		$	—		Interest income (expense)	$	79		$	79		Other income (expense)	$	—	$	—
Income tax (benefit) expense	$	—		$	—		Income tax (benefit) expense	$	52		$	—		Income tax (benefit) expense	$	—	$	—

For the three months endedDecember 28, 2013, the derivative instruments that are not designated as hedging instruments resulted in the recognition of a $0.1 million gain recorded in other (income) expense on the Condensed Consolidated Statement of Comprehensive Income.

During the third quarter of fiscal 2011, when the fixed interest rate for the Company's issuance of $175 million of Notes was determined, all three related treasury rate lock contracts that were previously entered into settled and the Company received proceeds of $2.3 million, which is being amortized over the seven year term of the related debt.

The following table lists the fair values of assets/(liabilities) of the Company’s derivatives as of December 28, 2013, by input level as defined above (in thousands):

Derivatives	Level 1		Level 2			Level 3		Total
Interest rate swaps	$	—	$	135		$	—	$	135
Foreign currency forward contracts - designated as hedging instruments	$	—	$	(1,491	)	$	—	$	(1,491	)
Foreign currency forward contracts - not designated as hedging instruments	$	—	$	135		$	—	$	135

The fair value of interest rate swaps and foreign currency forward contracts is determined using a market approach which includes obtaining directly or indirectly observable values from third parties active in the relevant markets. The primary input in the fair value of the interest rate swaps is the relevant LIBOR forward curve. Inputs in the fair value of the foreign currency forward contracts include prevailing forward and spot prices for currency and interest rate forward curves.

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Restructuring Costs (Tables)

3 Months Ended

Dec. 28, 2013

Restructuring Costs [Abstract]

Restructuring and Related Costs [Table Text Block]

The Company's restructuring cost accrual activity for the three months ended December 28, 2013 is included in the table below:

	Employee
	Termination				Other
	and Severance		Lease		Exit
	Costs		Obligations		Costs			Total
Accrual balance, September 28, 2013	$	—	$	—	$	—		$	—
Restructuring costs	0.3		1.8		1.5			3.6
Amounts utilized	—		—		(0.7		)	(0.7		)
Accrual balance, December 28, 2013	$	0.3	$	1.8	$	0.8		$	2.9

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 28, 2013 Rate	Dec. 29, 2012 Rate	Sep. 28, 2013 Interest Rate Swaps [Member]
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income tax expense	$ 2,162	$ 1,070
Effective tax rates	11.00%	6.00%
Derivatives And Fair Value Measurements [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			$ 2,031

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Basis Of Presentation And Accounting Policies (Policy)

3 Months Ended

Dec. 28, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis Of Presentation

Basis of Presentation

The accompanying condensed consolidated financial statements included herein have been prepared by Plexus Corp. and its subsidiaries (together “Plexus” or the “Company”) without audit and pursuant to the rules and regulations of the United States (“U.S.”) Securities and Exchange Commission (“SEC”). In the opinion of the Company, the accompanying condensed consolidated financial statements reflect all adjustments, which include normal recurring adjustments necessary for the fair statement of the consolidated financial position of the Company as of December 28, 2013 and September 28, 2013, and the results of operations for the three months endedDecember 28, 2013 and December 29, 2012, and the cash flows for the same three month periods.

Certain information and footnote disclosures, normally included in financial statements prepared in accordance with generally accepted accounting principles, have been condensed or omitted pursuant to the SEC’s rules and regulations dealing with interim financial statements. However, the Company believes that the disclosures made in the condensed consolidated financial statements included herein are adequate to make the information presented not misleading. It is suggested that these condensed consolidated financial statements be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s 2013 Annual Report on Form 10-K.

The Company’s reportable segments consist of the “Americas” (“AMER”) segment, “Asia-Pacific” (“APAC”) segment and “Europe, Middle East, and Africa” (“EMEA”) segment. Refer to Note 9, "Business Segments," for further details on reportable segments.

Cash And Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include highly liquid investments with original maturities of three months or less at the time of purchase and are classified as Level 1 in the fair level hierarchy described below.

Fair Value Of Financial Instruments

Fair Value of Financial Instruments

The Company holds financial instruments consisting of cash and cash equivalents, accounts receivable, accounts payable, debt, derivatives, and capital lease obligations. The carrying values of cash and cash equivalents, accounts receivable, accounts payable, derivatives, and capital lease obligations as reported in the condensed consolidated financial statements approximate fair value. Accounts receivable were reflected at net realizable value based on anticipated losses due to potentially uncollectible balances. Anticipated losses were based on management’s analysis of historical losses and changes in customers’ credit status. The fair value of the Company’s long-term debt was $247.2 million and $246.8 million as of December 28, 2013 and September 28, 2013, respectively. The carrying value of the Company’s long-term debt was $250.0 million for both the periods ended December 28, 2013 and September 28, 2013. The Company uses quoted market prices when available or discounted cash flows to calculate the fair value of its debt. If measured at fair value in the financial statements, long-term debt (including the current portion) would be classified as Level 2 in the fair value hierarchy described below. Refer to Note 5, "Derivatives and Fair Value Measurements," for further details on derivatives.

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (or exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The accounting guidance establishes a fair value hierarchy based on three levels of inputs that may be used to measure fair value. The input levels are:

Level 1: Quoted (observable) market prices in active markets for identical assets or liabilities.

Level 2: Inputs other than Level 1 that are observable, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the asset or liability.

Level 3: Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the asset or liability.