Earnings per Share (Tables)

12 Months Ended

Oct. 01, 2023

Earnings Per Share [Abstract]

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

The following table sets forth the number of weighted-average shares used to compute basic and diluted EPS (in thousands, except per share data):

	Fiscal Year Ended
	October 1, 2023		October 2, 2022		October 3, 2021
Net income attributable to Tetra Tech	$	273,420	$	263,125	$	232,810
Weighted-average common shares outstanding – basic	53,203		53,620		54,078
Effect of diluted stock options and unvested restricted stock	434		543		597
Weighted-average common stock outstanding – diluted	53,637		54,163		54,675
Earnings per share attributable to Tetra Tech:
Basic	$	5.14	$	4.91	$	4.31
Diluted	$	5.10	$	4.86	$	4.26