Earnings Per Share (''EPS'') (Tables)

3 Months Ended

Dec. 29, 2013

Earnings Per Share (''EPS'')

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

	Three Months Ended
	December 29,2013		December 30,2012
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	27,315	$	26,224
Weighted-average common shares outstanding - basic	64,227		63,864
Effect of dilutive stock options and unvested restricted stock	821		744
Weighted-average common stock outstanding - diluted	65,048		64,608
Earnings per share attributable to Tetra Tech:
Basic	$	0.43	$	0.41
Diluted	$	0.42	$	0.41