Earnings per Share (Tables)

12 Months Ended

Sep. 29, 2024

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):

	Fiscal Year Ended
	September 29, 2024		October 1, 2023		October 2, 2022
Net income attributable to Tetra Tech	$	333,382	$	273,420	$	263,125
Weighted-average common shares outstanding – basic	267,364		266,015		268,100
Effect of diluted stock options and unvested restricted stock	2,125		2,170		2,715
Shares issuable assuming conversion of convertible notes	553		—		—
Weighted-average common stock outstanding – diluted	270,042		268,185		270,815
Earnings per share attributable to Tetra Tech:
Basic	$	1.25	$	1.03	$	0.98
Diluted	$	1.23	$	1.02	$	0.97