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Quarterly Financial Information – Unaudited
 12 Months Ended
Sep. 28, 2025
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information – Unaudited Quarterly Financial Information – Unaudited
In the opinion of management, the following unaudited quarterly data for the fiscal 2025 and 2024 reflect all adjustments necessary for a fair statement of the results of operations (in thousands, except per share data).
 First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
Fiscal Year 2025    
Revenue$1,420,561 $1,322,113 $1,369,816 $1,330,100 
Income from operations22,526 39,603 164,986 181,304 
Net income attributable to Tetra Tech747 5,388 113,844 127,745 
Earnings per share attributable to Tetra Tech:    
Basic$— $0.02 $0.43 $0.49 
Diluted$— $0.02 $0.43 $0.48 
Weighted-average common shares outstanding:    
Basic267,854 265,728 263,026 262,184 
Diluted271,886 267,439 264,855 264,247 
Fiscal Year 2024    
Revenue$1,228,267 $1,251,616 $1,344,323 $1,374,473 
Income from operations111,081 117,683 128,630 143,343 
Net income attributable to Tetra Tech74,972 76,446 85,810 96,154 
Earnings per share attributable to Tetra Tech:    
Basic$0.28 $0.29 $0.32 $0.36 
Diluted$0.28 $0.28 $0.32 $0.35 
Weighted-average common shares outstanding:    
Basic266,585 267,420 267,575 267,687 
Diluted268,690 269,375 270,260 271,656