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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Income Statement [Abstract]      
Revenue $ 2,753,360 $ 2,583,469 $ 2,299,321
Subcontractor costs (719,350) (654,264) (580,606)
Other costs of revenue (1,680,372) (1,598,994) (1,402,925)
Gross profit 353,638 330,211 315,790
Selling, general and administrative expenses (177,219) (171,985) (170,456)
Acquisition and integration expenses 0 (19,548) 0
Contingent consideration – fair value adjustments 6,923 (2,823) 3,113
Impairment of goodwill and other intangible assets 0 0 (60,763)
Operating income 183,342 135,855 87,684
Interest income 729 996 680
Interest expense (12,310) (12,385) (8,043)
Income before income tax expense 171,761 124,466 80,321
Income tax expense (53,844) (40,613) (41,093)
Net income including noncontrolling interests 117,917 83,853 39,228
Net income from noncontrolling interests (43) (70) (154)
Net income attributable to Tetra Tech $ 117,874 $ 83,783 $ 39,074
Earnings per share attributable to Tetra Tech:      
Basic (in dollars per share) $ 2.07 $ 1.44 $ 0.64
Diluted (in dollars per share) $ 2.04 $ 1.42 $ 0.64
Weighted-average common shares outstanding:      
Basic (in shares) 56,911 58,186 60,913
Diluted (in shares) 57,913 58,966 61,532
Cash dividends paid per share (in dollars per share) $ 0.38 $ 0.34 $ 0.30