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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Sep. 29, 2013
Sep. 30, 2012
Oct. 02, 2011
Consolidated Statements of Operations      
Revenue $ 2,613,755 $ 2,711,075 $ 2,573,144
Subcontractor costs (588,923) (689,005) (780,817)
Other costs of revenue (1,757,842) (1,663,065) (1,454,374)
Selling, general and administrative expenses (199,732) (210,970) (193,286)
Contingent consideration - fair value adjustments 9,560 19,246 1,755
Impairment of goodwill (56,600) (914)  
Operating income 20,218 166,367 146,422
Interest income 1,003 873 879
Interest expense (8,689) (6,444) (6,809)
Income before income tax expense 12,532 160,796 140,492
Income tax expense (14,038) (56,064) (47,510)
Net income (loss) including noncontrolling interests (1,506) 104,732 92,982
Net income attributable to noncontrolling interests (635) (352) (2,943)
Net income (loss) attributable to Tetra Tech $ (2,141) $ 104,380 $ 90,039
Net income (loss) attributable to Tetra Tech per share:      
Basic (in dollars per share) $ (0.03) $ 1.65 $ 1.45
Diluted (in dollars per share) $ (0.03) $ 1.63 $ 1.43
Weighted-average common shares outstanding:      
Basic (in shares) 64,544 63,217 62,053
Diluted (in shares) 64,544 63,934 62,775