Earnings per Share ("EPS") (Tables)

3 Months Ended

Jan. 01, 2023

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 (in thousands, except per share data):

	Three Months Ended
	January 1, 2023		January 2, 2022
Net income attributable to Tetra Tech	$	116,706	$	68,489
Weighted-average common shares outstanding – basic	53,069		53,937
Effect of dilutive stock options and unvested restricted stock	460		640
Weighted-average common shares outstanding – diluted	53,529		54,577
Earnings per share attributable to Tetra Tech:
Basic	$	2.20	$	1.27
Diluted	$	2.18	$	1.25