Earnings per Share (Tables)

12 Months Ended

Oct. 02, 2022

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:

	Fiscal Year Ended
	October 2, 2022		October 3, 2021		September 27, 2020
	(in thousands, except per share data)
Net income attributable to Tetra Tech	$	263,125	$	232,810	$	173,859
Weighted-average common shares outstanding – basic	53,620		54,078		54,235
Effect of diluted stock options and unvested restricted stock	543		597		787
Weighted-average common stock outstanding – diluted	54,163		54,675		55,022
Earnings per share attributable to Tetra Tech:
Basic	$	4.91	$	4.31	$	3.21
Diluted	$	4.86	$	4.26	$	3.16