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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 | 159,556 | 159,536 |  |  |  | 159,536 | 20
Other comprehensive income (loss) | 26,762 | 26,763 |  |  | 26,763 |  | (1)
Cash dividends per common share | (24,428) | (24,428) |  |  |  | (24,428) |
Stock-based compensation | 14,602 | 14,602 |  | 14,602 |  |  |
Restricted & performance shares released (in shares) |  |  | 146 |  |  |  |
Restricted & performance shares released | (16,680) | (16,680) | $ 1 | (16,681) |  |  |
Stock options exercised (in shares) |  |  | 3 |  |  |  |
Stock options exercised | 91 | 91 |  | 91 |  |  |
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 Apr. 02, 2023 |  |  | 53,228 |  |  |  |
Ending balance at Apr. 02, 2023 | 1,355,668 | 1,355,599 | $ 532 | 10,639 | (181,381) | 1,525,809 | 69
Beginning balance (in shares) at Jan. 01, 2023 |  |  | 53,226 |  |  |  |
Beginning balance at Jan. 01, 2023 | 1,323,967 | 1,323,908 | $ 532 | 3,281 | (175,126) | 1,495,221 | 59
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 42,841 | 42,830 |  |  |  | 42,830 | 11
Other comprehensive income (loss) | (6,256) | (6,255) |  |  | (6,255) |  | (1)
Cash dividends per common share | (12,242) | (12,242) |  |  |  | (12,242) |
Stock-based compensation | 7,418 | 7,418 |  | 7,418 |  |  |
Restricted & performance shares released (in shares) |  |  | 1 |  |  |  |
Restricted & performance shares released | (94) | (94) |  | (94) |  |  |
Stock options exercised (in shares) |  |  | 1 |  |  |  |
Stock options exercised | 34 | 34 |  | 34 |  |  |
Ending balance (in shares) at Apr. 02, 2023 |  |  | 53,228 |  |  |  |
Ending balance at Apr. 02, 2023 | 1,355,668 | 1,355,599 | $ 532 | 10,639 | (181,381) | 1,525,809 | 69
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 | 151,439 | 151,418 |  |  |  | 151,418 | 21
Other comprehensive income (loss) | 38,749 | 38,749 |  |  | 38,749 |  |
Distributions paid to noncontrolling interests | (38) |  |  |  |  |  | (38)
Cash dividends per common share | (27,781) | (27,781) |  |  |  | (27,781) |
Stock-based compensation | 15,617 | 15,617 |  | 15,617 |  |  |
Restricted & performance shares released (in shares) |  |  | 107 |  |  |  |
Restricted & performance shares released | (12,781) | (12,781) | $ 1 | (12,782) |  |  |
Stock options exercised (in shares) |  |  | 38 |  |  |  |
Stock options exercised | 1,462 | 1,462 | $ 1 | 1,461 |  |  |
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 Mar. 31, 2024 |  |  | 53,497 |  |  |  |
Ending balance at Mar. 31, 2024 | 1,584,850 | 1,584,794 | $ 535 | 18,972 | (156,546) | 1,721,833 | 56
Beginning balance (in shares) at Dec. 31, 2023 |  |  | 53,466 |  |  |  |
Beginning balance at Dec. 31, 2023 | 1,537,687 | 1,537,606 | $ 534 | 9,979 | (132,202) | 1,659,295 | 81
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 76,459 | 76,446 |  |  |  | 76,446 | 13
Other comprehensive income (loss) | (24,344) | (24,344) |  |  | (24,344) |  |
Distributions paid to noncontrolling interests | (38) |  |  |  |  |  | (38)
Cash dividends per common share | (13,908) | (13,908) |  |  |  | (13,908) |
Stock-based compensation | 7,976 | 7,976 |  | 7,976 |  |  |
Restricted & performance shares released (in shares) |  |  | 2 |  |  |  |
Restricted & performance shares released | (111) | (111) |  | (111) |  |  |
Stock options exercised (in shares) |  |  | 29 |  |  |  |
Stock options exercised | 1,127 | 1,127 | $ 1 | 1,126 |  |  |
Shares issued for Employee Stock Purchase Plan | 2 | 2 |  | 2 |  |  |
Ending balance (in shares) at Mar. 31, 2024 |  |  | 53,497 |  |  |  |
Ending balance at Mar. 31, 2024 | $ 1,584,850 | $ 1,584,794 | $ 535 | $ 18,972 | $ (156,546) | $ 1,721,833 | $ 56

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