Earnings Per Share ("EPS") (Tables)

3 Months Ended

Dec. 30, 2012

Earnings Per Share ("EPS")

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

	Three Months Ended
	December 30,2012		January 1,2012
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	26,224	$	22,610
Weighted-average common shares outstanding - basic	63,864		62,433
Effect of dilutive stock options and unvested restricted stock	744		635
Weighted-average common stock outstanding - diluted	64,608		63,068
Earnings per share attributable to Tetra Tech:
Basic	$	0.41	$	0.36
Diluted	$	0.41	$	0.36