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Quarterly Financial Information – Unaudited (Tables)
 12 Months Ended
Oct. 01, 2023
Quarterly Financial Information Disclosure [Abstract]  
Schedule of unaudited quarterly data
 First
Quarter		Second
Quarter		Third
Quarter		Fourth
Quarter
 
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$2.20 $0.80 $1.13 $1.01 
Diluted$2.18 $0.80 $1.12 $1.00 
Weighted-average common shares outstanding:    
Basic53,069 53,227 53,231 53,247 
Diluted53,529 53,627 53,653 53,702 
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