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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. 02, 2022 |  |  | 52,981 |  |  |  |
Beginning balance at Oct. 02, 2022 | $ 1,183,137 | $ 1,183,087 | $ 530 | $ 0 | $ (208,144) | $ 1,390,701 | $ 50
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 219,794 | 219,771 |  |  |  | 219,771 | 23
Other comprehensive income | 70,218 | 70,218 |  |  | 70,218 |  |
Cash dividends per common share | (38,268) | (38,268) |  |  |  | (38,268) |
Stock-based compensation | 21,640 | 21,640 |  | 21,640 |  |  |
Restricted & performance shares released (in shares) |  |  | 149 |  |  |  |
Restricted & performance shares released | (16,785) | (16,785) | $ 1 | (16,786) |  |  |
Stock options exercised (in shares) |  |  | 15 |  |  |  |
Stock options exercised | 425 | 425 |  | 425 |  |  |
Shares issued for Employee Stock Purchase Plan (in shares) |  |  | 98 |  |  |  |
Shares issued for Employee Stock Purchase Plan | 12,628 | 12,628 | $ 1 | 12,627 |  |  |
Ending balance (in shares) at Jul. 02, 2023 |  |  | 53,243 |  |  |  |
Ending balance at Jul. 02, 2023 | 1,452,789 | 1,452,716 | $ 532 | 17,906 | (137,926) | 1,572,204 | 73
Beginning balance (in shares) at Apr. 02, 2023 |  |  | 53,228 |  |  |  |
Beginning balance at Apr. 02, 2023 | 1,355,668 | 1,355,599 | $ 532 | 10,639 | (181,381) | 1,525,809 | 69
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 60,238 | 60,235 |  |  |  | 60,235 | 3
Other comprehensive income | 43,456 | 43,455 |  |  | 43,455 |  | 1
Cash dividends per common share | (13,840) | (13,840) |  |  |  | (13,840) |
Stock-based compensation | 7,038 | 7,038 |  | 7,038 |  |  |
Restricted & performance shares released (in shares) |  |  | 3 |  |  |  |
Restricted & performance shares released | (105) | (105) |  | (105) |  |  |
Stock options exercised (in shares) |  |  | 12 |  |  |  |
Stock options exercised | 334 | 334 |  | 334 |  |  |
Ending balance (in shares) at Jul. 02, 2023 |  |  | 53,243 |  |  |  |
Ending balance at Jul. 02, 2023 | 1,452,789 | 1,452,716 | $ 532 | 17,906 | (137,926) | 1,572,204 | 73
Beginning balance (in shares) at Oct. 01, 2023 |  |  | 53,248 |  |  |  |
Beginning balance at Oct. 01, 2023 | 1,403,506 | 1,403,433 | $ 532 | 0 | (195,295) | 1,598,196 | 73
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 237,263 | 237,228 |  |  |  | 237,228 | 35
Other comprehensive income | 40,606 | 40,606 |  |  | 40,606 |  |
Distributions paid to noncontrolling interests | (43) |  |  |  |  |  | (43)
Cash dividends per common share | (43,303) | (43,303) |  |  |  | (43,303) |
Stock-based compensation | 23,713 | 23,713 |  | 23,713 |  |  |
Restricted & performance shares released (in shares) |  |  | 108 |  |  |  |
Restricted & performance shares released | (12,906) | (12,906) | $ 1 | (12,907) |  |  |
Stock options exercised (in shares) |  |  | 72 |  |  |  |
Stock options exercised | 2,690 | 2,690 | $ 1 | 2,689 |  |  |
Shares issued for Employee Stock Purchase Plan (in shares) |  |  | 104 |  |  |  |
Shares issued for Employee Stock Purchase Plan | 14,677 | 14,677 | $ 1 | 14,676 |  |  |
Ending balance (in shares) at Jun. 30, 2024 |  |  | 53,532 |  |  |  |
Ending balance at Jun. 30, 2024 | 1,666,203 | 1,666,138 | $ 535 | 28,171 | (154,689) | 1,792,121 | 65
Beginning balance (in shares) at Mar. 31, 2024 |  |  | 53,497 |  |  |  |
Beginning balance at Mar. 31, 2024 | 1,584,850 | 1,584,794 | $ 535 | 18,972 | (156,546) | 1,721,833 | 56
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 85,824 | 85,810 |  |  |  | 85,810 | 14
Other comprehensive income | 1,857 | 1,857 |  |  | 1,857 |  |
Distributions paid to noncontrolling interests | (5) |  |  |  |  |  | (5)
Cash dividends per common share | (15,522) | (15,522) |  |  |  | (15,522) |
Stock-based compensation | 8,096 | 8,096 |  | 8,096 |  |  |
Restricted & performance shares released (in shares) |  |  | 1 |  |  |  |
Restricted & performance shares released | (125) | (125) |  | (125) |  |  |
Stock options exercised (in shares) |  |  | 34 |  |  |  |
Stock options exercised | 1,228 | 1,228 |  | 1,228 |  |  |
Ending balance (in shares) at Jun. 30, 2024 |  |  | 53,532 |  |  |  |
Ending balance at Jun. 30, 2024 | $ 1,666,203 | $ 1,666,138 | $ 535 | $ 28,171 | $ (154,689) | $ 1,792,121 | $ 65

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