Earnings Per Share ("EPS") (Tables)

9 Months Ended

Jul. 01, 2012

Earnings Per Share ("EPS")

Schedule of number of weighted-average shares used to compute basic and diluted EPS

	Three Months Ended				Nine Months Ended
	July 1, 2012		July 3, 2011		July 1, 2012		July 3, 2011
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	29,054	$	23,839	$	73,948	$	63,639
Weighted-average common shares outstanding – basic	63,387		62,203		63,054		61,967
Effect of dilutive stock options and unvested restricted stock	792		731		698		778
Weighted-average common stock outstanding – diluted	64,179		62,934		63,752		62,745
Earnings per share attributable to Tetra Tech:
Basic	$	0.46	$	0.38	$	1.17	$	1.03
Diluted	$	0.45	$	0.38	$	1.16	$	1.01