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Quarterly Financial Information – Unaudited
 12 Months Ended
Sep. 29, 2024
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 2024 and 2023 reflect all adjustments necessary for a fair statement of the results of operations (in thousands, except per share data).
In the first and second quarters of fiscal 2023, we recognized $68.0 million and $21.4 million, respectively, of unrealized gain on a foreign currency forward contract related to the planned acquisition of RPS. We also recorded a $16.4 million non-cash impairment charge related to our ROU operating lease assets in the fourth quarter of fiscal 2023 (see Note 10, "Leases" for more information). Additionally, we incurred $33.2 million of acquisition and integration expenses in fiscal 2023 (largely comprised of $19.9 million in the second quarter and $7.3 million in fourth quarter) as described in Note 5, "Acquisitions".
 First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
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 
Fiscal Year 2023    
Revenue$894,766 $1,158,226 $1,208,947 $1,260,611 
Income from operations92,050 61,011 97,675 107,377 
Net income attributable to Tetra Tech116,706 42,830 60,235 53,649 
Earnings per share attributable to Tetra Tech:    
Basic$0.44 $0.16 $0.23 $0.20 
Diluted$0.44 $0.16 $0.22 $0.20 
Weighted-average common shares outstanding:    
Basic265,345 266,135 266,155 266,235 
Diluted267,645 268,135 268,265 268,510