Earnings Per Share ("EPS") (Tables)

3 Months Ended

Dec. 27, 2015

Earnings Per Share ("EPS")

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

	Three Months Ended
	December 27, 2015		December 28, 2014
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	23,239	$	25,575
Weighted-average common shares outstanding - basic	59,058		62,452
Effect of dilutive stock options and unvested restricted stock	735		660
Weighted-average common stock outstanding - diluted	59,793		63,112
Earnings per share attributable to Tetra Tech:
Basic	$	0.39	$	0.41
Diluted	$	0.39	$	0.41