Earnings per Share ("EPS") (Tables)

3 Months Ended

Jan. 02, 2022

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
	January 2, 2022		December 27, 2020
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	68,489	$	52,436
Weighted-average common shares outstanding – basic	53,937		53,927
Effect of dilutive stock options and unvested restricted stock	640		710
Weighted-average common shares outstanding – diluted	54,577		54,637
Earnings per share attributable to Tetra Tech:
Basic	$	1.27	$	0.97
Diluted	$	1.25	$	0.96