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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Total Tetra Tech Equity
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Non-Controlling Interests
Beginning balance (in shares) at Oct. 01, 2023     266,238        
Beginning balance at Oct. 01, 2023 $ 1,403,506 $ 1,403,433 $ 2,662 $ 0 $ (195,295) $ 1,596,066 $ 73
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 74,980 74,972       74,972 8
Other comprehensive income (loss) 63,093 63,093     63,093    
Cash dividends per common share (13,873) (13,873)       (13,873)  
Stock-based compensation 7,641 7,641   7,641      
Restricted & performance shares released (in shares)     524        
Restricted & performance shares released (12,670) (12,670) $ 5 (12,675)      
Stock options exercised (in shares)     45        
Stock options exercised 335 335   335      
Shares issued for Employee Stock Purchase Plan (in shares)     522        
Shares issued for Employee Stock Purchase Plan 14,675 14,675 $ 5 14,670      
Ending balance (in shares) at Dec. 31, 2023     267,329        
Ending balance at Dec. 31, 2023 1,537,687 1,537,606 $ 2,672 9,971 (132,202) 1,657,165 81
Beginning balance (in shares) at Sep. 29, 2024     267,717        
Beginning balance at Sep. 29, 2024 1,830,413 1,830,322 $ 2,677 35,900 (78,875) 1,870,620 91
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 778 747       747 31
Other comprehensive income (loss) (108,879) (108,879)     (108,879)    
Cash dividends per common share (15,549) (15,549)       (15,549)  
Stock-based compensation 8,142 8,142   8,142      
Restricted & performance shares released (in shares)     432        
Restricted & performance shares released (13,307) (13,307) $ 5 (13,312)      
Stock options exercised (in shares)     21        
Stock options exercised 114 114   114      
Shares issued for Employee Stock Purchase Plan (in shares)     458        
Shares issued for Employee Stock Purchase Plan 15,307 15,307 $ 4 15,303      
Stock repurchase (in shares)     (600)        
Stock repurchase (25,000) (25,000) $ (6) (24,994)      
Ending balance (in shares) at Dec. 29, 2024     268,028        
Ending balance at Dec. 29, 2024 $ 1,692,019 $ 1,691,897 $ 2,680 $ 21,153 $ (187,754) $ 1,855,818 $ 122