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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Total Tetra Tech Equity
Non-Controlling Interests
Beginning balance (in shares) at Sep. 29, 2019   54,565          
Beginning balance at Sep. 29, 2019 $ 989,464 $ 546 $ 78,132 $ (160,584) $ 1,071,192 $ 989,286 $ 178
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 47,317       47,310 47,310 7
Other comprehensive income, net of tax 15,571     15,569   15,569 2
Distributions paid to noncontrolling interests (13)           (13)
Cash dividends per common share (8,190)       (8,190) (8,190)  
Stock-based compensation 4,482   4,482     4,482  
Restricted & performance shares released (in shares)   185          
Restricted & performance shares released (10,818) $ 1 (10,819)     (10,818)  
Stock options exercised (in shares)   54          
Stock options exercised 1,413 $ 1 1,412     1,413  
Shares issued for Employee Stock Purchase Plan (in shares)   168          
Shares issued for Employee Stock Purchase Plan 8,716 $ 1 8,715     8,716  
Stock repurchases (in shares)   (244)          
Stock repurchases (21,177) $ (2) (21,175)     (21,177)  
Ending balance (in shares) at Dec. 29, 2019   54,728          
Ending balance at Dec. 29, 2019 1,026,765 $ 547 60,747 (145,015) 1,110,312 1,026,591 174
Beginning balance (in shares) at Sep. 27, 2020   53,797          
Beginning balance at Sep. 27, 2020 1,037,373 $ 538 0 (161,786) 1,198,567 1,037,319 54
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 52,448       52,436 52,436 12
Other comprehensive income, net of tax 33,869     33,867   33,867 2
Cash dividends per common share (9,198)       (9,198) (9,198)  
Stock-based compensation 4,898   4,898     4,898  
Restricted & performance shares released (in shares)   209          
Restricted & performance shares released (17,330) $ 2 (17,332)     (17,330)  
Stock options exercised (in shares)   198          
Stock options exercised 7,495 $ 2 7,493     7,495  
Shares issued for Employee Stock Purchase Plan (in shares)   124          
Shares issued for Employee Stock Purchase Plan 10,699 $ 1 10,698     10,699  
Stock repurchases (in shares)   (135)          
Stock repurchases (15,000) $ (1) (5,757)   (9,242) (15,000)  
Ending balance (in shares) at Dec. 27, 2020   54,193          
Ending balance at Dec. 27, 2020 $ 1,105,254 $ 542 $ 0 $ (127,919) $ 1,232,563 $ 1,105,186 $ 68