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

6 Months Ended

Mar. 30, 2014

Earnings Per Share (''EPS'')

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

	Three Months Ended				Six Months Ended
	March 30, 2014		March 31, 2013		March 30, 2014		March 31, 2013
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	31,709	$	24,820	$	59,023	$	51,043
Weighted-average common shares outstanding – basic	64,835		64,551		64,670		64,376
Effect of dilutive stock options and unvested restricted stock	875		921		847		832
Weighted-average common stock outstanding – diluted	65,710		65,472		65,517		65,208
Earnings per share attributable to Tetra Tech:
Basic	$	0.49	$	0.38	$	0.91	$	0.79
Diluted	$	0.48	$	0.38	$	0.90	$	0.78