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Consolidated Statements of Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Total Tetra Tech Equity
Non-Controlling Interests
Beginning balance (in shares) at Oct. 02, 2016   57,042          
Beginning balance at Oct. 02, 2016 $ 869,403 $ 570 $ 260,340 $ (128,008) $ 736,357 $ 869,259 $ 144
Comprehensive income, net of tax:              
Net income 117,917       117,874 117,874 43
Foreign currency translation adjustments 27,902     27,894   27,894 8
Gain on cash flow hedge valuations 1,614     1,614   1,614  
Comprehensive income 147,433         147,382 51
Distributions paid to noncontrolling interests (24)           (24)
Cash dividends (21,672)       (21,672) (21,672)  
Stock-based compensation 13,450   13,450     13,450  
Stock options exercised (in shares)   791          
Stock options exercised 18,564 $ 8 18,556     18,564  
Restricted & performance shares released (in shares)   116          
Restricted & performance shares released (3,470) $ 2 (3,472)     (3,470)  
Shares issued for Employee Stock Purchase Plan (in shares)   190          
Shares issued for Employee Stock Purchase Plan 4,940 $ 2 4,938     4,940  
Stock repurchases (in shares)   (2,266)          
Stock repurchases (100,000) $ (23) (99,977)     (100,000)  
Ending balance (in shares) at Oct. 01, 2017   55,873          
Ending balance at Oct. 01, 2017 928,624 $ 559 193,835 (98,500) 832,559 928,453 171
Comprehensive income, net of tax:              
Net income 136,957       136,883 136,883 74
Foreign currency translation adjustments (29,720)     (29,656)   (29,656) (64)
Gain on cash flow hedge valuations 806     806   806  
Comprehensive income 108,043         108,033 10
Distributions paid to noncontrolling interests (52)           (52)
Cash dividends (24,477)       (24,477) (24,477)  
Stock-based compensation 19,582   19,582     19,582  
Stock options exercised (in shares)   549          
Stock options exercised 13,511 $ 5 13,506     13,511  
Restricted & performance shares released (in shares)   277          
Restricted & performance shares released (8,871) $ 3 (8,874)     (8,871)  
Shares issued for Employee Stock Purchase Plan (in shares)   142          
Shares issued for Employee Stock Purchase Plan 5,740 $ 1 5,739     5,740  
Stock repurchases (in shares)   (1,492)          
Stock repurchases (75,000) $ (15) (74,985)     (75,000)  
Ending balance (in shares) at Sep. 30, 2018   55,349          
Ending balance at Sep. 30, 2018 967,100 $ 553 148,803 (127,350) 944,965 966,971 129
Comprehensive income, net of tax:              
Net income 158,761       158,668 158,668 93
Foreign currency translation adjustments (20,866)     (21,109)   (21,109) 243
Gain on cash flow hedge valuations (12,125)     (12,125)   (12,125)  
Comprehensive income 125,770         125,434 336
Distributions paid to noncontrolling interests (287)           (287)
Cash dividends (29,674)       (29,674) (29,674)  
Stock-based compensation $ 17,618   17,618     17,618  
Stock options exercised (in shares) 456 448          
Stock options exercised $ 11,751 $ 5 11,746     11,751  
Restricted & performance shares released (in shares)   183          
Restricted & performance shares released (6,893) $ 2 (6,895)     (6,893)  
Shares issued for Employee Stock Purchase Plan (in shares)   148          
Shares issued for Employee Stock Purchase Plan 6,846 $ 2 6,844     6,846  
Stock repurchases (in shares)   (1,563)          
Stock repurchases (100,000) $ (16) (99,984)     (100,000)  
Ending balance (in shares) at Sep. 29, 2019   54,565          
Ending balance at Sep. 29, 2019 $ 989,464 $ 546 $ 78,132 $ (160,584) $ 1,071,192 $ 989,286 $ 178