Earnings per Share ("EPS") (Tables)

9 Months Ended

Jun. 27, 2021

Earnings Per Share [Abstract]

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

The following table presents the number of weighted-average shares used to compute basic and diluted EPS:

	Three Months Ended				Nine Months Ended
	June 27, 2021		June 28, 2020		June 27, 2021		June 28, 2020
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	51,903	$	45,497	$	149,856	$	129,205
Weighted-average common shares outstanding – basic	54,117		53,985		54,095		54,366
Effect of dilutive stock options and unvested restricted stock	549		707		603		795
Weighted-average common shares outstanding – diluted	54,666		54,692		54,698		55,161
Earnings per share attributable to Tetra Tech:
Basic	$	0.96	$	0.84	$	2.77	$	2.38
Diluted	$	0.95	$	0.83	$	2.74	$	2.34