Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jul. 01, 2012	Oct. 02, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 140,665	$ 90,494
Accounts receivable - net	697,210	657,179
Prepaid expenses and other current assets	49,060	84,612
Income taxes receivable	11,827	6,817
Total current assets	898,762	839,102
PROPERTY AND EQUIPMENT - NET	76,531	77,536
INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED JOINT VENTURES	3,255	3,454
GOODWILL	627,181	569,414
INTANGIBLE ASSETS - NET	80,489	81,053
OTHER ASSETS	23,401	23,429
TOTAL ASSETS	1,709,619	1,593,988
CURRENT LIABILITIES:
Accounts payable	165,481	164,819
Accrued compensation	122,382	110,937
Billings in excess of costs on uncompleted contracts	94,659	84,754
Deferred income taxes	20,490	22,870
Current portion of long-term debt	2,253	2,556
Estimated contingent earn-out liabilities	48,293	64,119
Other current liabilities	76,864	81,654
Total current liabilities	530,422	531,709
DEFERRED INCOME TAXES	24,542	25,394
LONG-TERM DEBT	140,539	144,868
OTHER LONG-TERM LIABILITIES	45,963	36,767
COMMITMENTS AND CONTINGENCIES
EQUITY:
Preferred stock - Authorized, 2,000 shares of $0.01 par value; no shares issued and outstanding at July 1, 2012, and October 2, 2011
Common stock - Authorized, 150,000 shares of $0.01 par value; issued and outstanding, 63,571 and 62,495 shares at July 1, 2012, and October 2, 2011, respectively	636	625
Additional paid-in capital	425,178	399,420
Accumulated other comprehensive income	17,693	4,754
Retained earnings	523,874	449,926
Tetra Tech stockholders' equity	967,381	854,725
Noncontrolling interests	772	525
TOTAL EQUITY	968,153	855,250
TOTAL LIABILITIES AND EQUITY	$ 1,709,619	$ 1,593,988