Earnings Per Share (Tables)

12 Months Ended

Sep. 30, 2012

Earnings Per Share

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

	Fiscal Year Ended
	September 30, 2012		October 2, 2011		October 3, 2010
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	104,380	$	90,039	$	76,819
Weighted-average common shares outstanding – basic		63,217		62,053		61,430
Effect of diluted stock options and unvested restricted stock		717		722		657
Weighted-average common stock outstanding – diluted		63,934		62,775		62,087
Earnings per share attributable to Tetra Tech:
Basic	$	1.65	$	1.45	$	1.25
Diluted	$	1.63	$	1.43	$	1.24