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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

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