Earnings Per Share (EPS) (Tables)

9 Months Ended

Jul. 03, 2011

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 3, 2011		June 27, 2010		July 3, 2011		June 27, 2010
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	23,839	$	20,639	$	63,639	$	53,678
Weighted-average common shares outstanding – basic		62,203		61,560		61,967		61,380
Effect of dilutive stock options and unvested restricted stock		731		621		778		735
Weighted-average common stock outstanding – diluted		62,934		62,181		62,745		62,115
Earnings per share attributable to Tetra Tech:
Basic	$	0.38	$	0.34	$	1.03	$	0.87
Diluted	$	0.38	$	0.33	$	1.01	$	0.86