Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Oct. 02, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 106,027	$ 90,494
Accounts receivable - net	642,420	657,179
Prepaid expenses and other current assets	62,325	84,612
Income taxes receivable	11,922	6,817
Total current assets	822,694	839,102
PROPERTY AND EQUIPMENT - NET	72,393	77,536
INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED JOINT VENTURES	3,550	3,454
GOODWILL	584,141	569,414
INTANGIBLE ASSETS - NET	68,875	81,053
OTHER ASSETS	24,431	23,429
TOTAL ASSETS	1,576,084	1,593,988
CURRENT LIABILITIES:
Accounts payable	141,426	164,819
Accrued compensation	97,160	110,937
Billings in excess of costs on uncompleted contracts	85,086	84,754
Deferred income taxes	18,879	22,870
Current portion of long-term debt	2,249	2,556
Estimated contingent earn-out liabilities	40,687	64,119
Other current liabilities	79,197	81,654
Total current liabilities	464,684	531,709
DEFERRED INCOME TAXES	28,269	25,394
LONG-TERM DEBT	107,901	144,868
OTHER LONG-TERM LIABILITIES	35,728	36,767
COMMITMENTS AND CONTINGENCIES
EQUITY:
Preferred stock - Authorized, 2,000 shares of $0.01 par value; no shares issued and outstanding at April 1, 2012, and October 2, 2011
Common stock - Authorized, 150,000 shares of $0.01 par value; issued and outstanding, 63,372 and 62,495 shares at April 1, 2012, and October 2, 2011, respectively	634	625
Additional paid-in capital	418,667	399,420
Accumulated other comprehensive income	24,711	4,754
Retained earnings	494,820	449,926
Tetra Tech stockholders' equity	938,832	854,725
Noncontrolling interests	670	525
TOTAL EQUITY	939,502	855,250
TOTAL LIABILITIES AND EQUITY	$ 1,576,084	$ 1,593,988