Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jan. 01, 2012	Oct. 02, 2011
CURRENT ASSETS:
Cash and cash equivalents	$ 105,720	$ 90,494
Accounts receivable - net	664,970	657,179
Prepaid expenses and other current assets	71,351	84,612
Income taxes receivable	4,262	6,817
Total current assets	846,303	839,102
PROPERTY AND EQUIPMENT - NET	75,307	77,536
INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED JOINT VENTURES	3,410	3,454
GOODWILL	577,406	569,414
INTANGIBLE ASSETS - NET	74,569	81,053
OTHER ASSETS	23,632	23,429
TOTAL ASSETS	1,600,627	1,593,988
CURRENT LIABILITIES:
Accounts payable	145,595	164,819
Accrued compensation	101,933	110,937
Billings in excess of costs on uncompleted contracts	93,571	84,754
Deferred income taxes	20,768	22,870
Current portion of long-term debt	2,259	2,556
Estimated contingent earn-out liabilities	54,487	64,119
Other current liabilities	85,774	81,654
Total current liabilities	504,387	531,709
DEFERRED INCOME TAXES	30,194	25,394
LONG-TERM DEBT	134,570	144,868
OTHER LONG-TERM LIABILITIES	37,419	36,767
COMMITMENTS AND CONTINGENCIES
EQUITY:
Preferred stock - Authorized, 2,000 shares of $0.01 par value; no shares issued and outstanding at January 1, 2012, and October 2, 2011
Common stock - Authorized, 150,000 shares of $0.01 par value; issued and outstanding, 62,748 and 62,495 shares at January 1, 2012, and October 2, 2011, respectively	627	625
Additional paid-in capital	404,896	399,420
Accumulated other comprehensive income	15,380	4,754
Retained earnings	472,536	449,926
Tetra Tech stockholders' equity	893,439	854,725
Noncontrolling interests	618	525
TOTAL EQUITY	894,057	855,250
TOTAL LIABILITIES AND EQUITY	$ 1,600,627	$ 1,593,988