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Quarterly Financial Information – Unaudited (Tables)
 12 Months Ended
Oct. 02, 2022
Quarterly Financial Information Disclosure [Abstract]  
Schedule of unaudited quarterly data
 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