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Quarterly Financial Information – Unaudited
 12 Months Ended
Oct. 02, 2022
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 years ended October 2, 2022 and October 3, 2021 reflect all adjustments necessary for a fair statement of the results of operations.
In the fourth quarter of fiscal 2022, we recognized a $19.9 million unrealized gain on a foreign currency forward contract related to the planned acquisition of RPS.
In the fourth quarter of fiscal 2021, we recognized a non-recurring net tax benefit of $21.6 million primarily consisting of valuation allowances in the United Kingdom that were released due to sufficient positive evidence being obtained.
 First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
 (in thousands, except per share data)
Fiscal Year 2022    
Revenue$858,510 $852,744 $890,231 $902,562 
Income from operations87,220 74,520 83,905 94,802 
Net income attributable to Tetra Tech68,489 53,040 58,650 82,947 
Earnings per share attributable to Tetra Tech:    
Basic$1.27 $0.99 $1.10 $1.56 
Diluted$1.25 $0.98 $1.09 $1.55 
Weighted-average common shares outstanding:    
Basic53,937 53,834 53,507 53,148 
Diluted54,577 54,346 54,006 53,667 
Fiscal Year 2021    
Revenue$765,104 $754,764 $801,633 $892,012 
Income from operations66,252 60,807 69,807 81,836 
Net income attributable to Tetra Tech52,436 45,517 51,903 82,954 
Earnings per share attributable to Tetra Tech:    
Basic$0.97 $0.84 $0.96 $1.54 
Diluted$0.96 $0.83 $0.95 $1.52 
Weighted-average common shares outstanding:    
Basic53,927 54,187 54,117 54,019 
Diluted54,637 54,736 54,666 54,597