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Consolidated Statements of Equity - USD ($) $ 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. 30, 2018 |  | 55,349,000 |  |  |  |  |
Beginning balance at Sep. 30, 2018 | $ 967,100 | $ 553 | $ 148,803 | $ (127,350) | $ 944,965 | $ 966,971 | $ 129
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 97,976 |  |  |  | 97,907 | 97,907 | 69
Other comprehensive income (loss) | (20,629) |  |  | (20,867) |  | (20,867) | 238
Distributions paid to noncontrolling interests | (276) |  |  |  |  |  | (276)
Cash dividends per common share | (13,270) |  |  |  | (13,270) | (13,270) |
Stock-based compensation | 8,595 |  | 8,595 |  |  | 8,595 |
Restricted & performance shares released (in shares) |  | 179,000 |  |  |  |  |
Restricted & performance shares released | (6,802) | $ 2 | (6,804) |  |  | (6,802) |
Stock options exercised (in shares) |  | 151,000 |  |  |  |  |
Stock options exercised | 3,834 | $ 2 | 3,832 |  |  | 3,834 |
Shares issued for Employee Stock Purchase Plan (in shares) |  | 148,000 |  |  |  |  |
Shares issued for Employee Stock Purchase Plan | 6,843 | $ 1 | 6,842 |  |  | 6,843 |
Stock repurchases (in shares) |  | (880,000) |  |  |  |  |
Stock repurchases | (50,000) | $ (9) | (49,991) |  |  | (50,000) |
Ending balance (in shares) at Mar. 31, 2019 |  | 54,947,000 |  |  |  |  |
Ending balance at Mar. 31, 2019 | 990,605 | $ 549 | 111,277 | (148,217) | 1,026,836 | 990,445 | 160
Beginning balance (in shares) at Dec. 30, 2018 |  | 55,326,000 |  |  |  |  |
Beginning balance at Dec. 30, 2018 | 954,301 | $ 553 | 130,753 | (154,693) | 977,541 | 954,154 | 147
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 55,944 |  |  |  | 55,911 | 55,911 | 33
Other comprehensive income (loss) | 6,477 |  |  | 6,476 |  | 6,476 | 1
Distributions paid to noncontrolling interests | (21) |  |  |  |  |  | (21)
Cash dividends per common share | (6,616) |  |  |  | (6,616) | (6,616) |
Stock-based compensation | 4,066 |  | 4,066 |  |  | 4,066 |
Restricted & performance shares released (in shares) |  | 5,000 |  |  |  |  |
Restricted & performance shares released | (66) | $ 0 | (66) |  |  | (66) |
Stock options exercised (in shares) |  | 65,000 |  |  |  |  |
Stock options exercised | 1,520 | $ 1 | 1,519 |  |  | 1,520 |
Stock repurchases (in shares) |  | (449,000) |  |  |  |  |
Stock repurchases | (25,000) | $ (5) | (24,995) |  |  | (25,000) |
Ending balance (in shares) at Mar. 31, 2019 |  | 54,947,000 |  |  |  |  |
Ending balance at Mar. 31, 2019 | 990,605 | $ 549 | 111,277 | (148,217) | 1,026,836 | 990,445 | 160
Beginning balance (in shares) at Sep. 29, 2019 |  | 54,565,000 |  |  |  |  |
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 | 83,730 |  |  |  | 83,707 | 83,707 | 23
Other comprehensive income (loss) | (38,809) |  |  | (38,807) |  | (38,807) | (2)
Distributions paid to noncontrolling interests | (69) |  |  |  |  |  | (69)
Cash dividends per common share | (16,414) |  |  |  | (16,414) | (16,414) |
Stock-based compensation | 9,437 |  | 9,437 |  |  | 9,437 |
Restricted & performance shares released (in shares) |  | 215,000 |  |  |  |  |
Restricted & performance shares released | (11,098) | $ 2 | (11,100) |  |  | (11,098) |
Stock options exercised (in shares) |  | 269,000 |  |  |  |  |
Stock options exercised | 7,927 | $ 3 | 7,924 |  |  | 7,927 |
Shares issued for Employee Stock Purchase Plan (in shares) |  | 168,000 |  |  |  |  |
Shares issued for Employee Stock Purchase Plan | 8,715 | $ 1 | 8,714 |  |  | 8,715 |
Stock repurchases (in shares) |  | (1,075,000) |  |  |  |  |
Stock repurchases | (82,645) | $ (11) | (82,634) |  |  | (82,645) |
Ending balance (in shares) at Mar. 29, 2020 |  | 54,142,000 |  |  |  |  |
Ending balance at Mar. 29, 2020 | 950,238 | $ 541 | 10,473 | (199,391) | 1,138,485 | 950,108 | 130
Beginning balance (in shares) at Dec. 29, 2019 |  | 54,728,000 |  |  |  |  |
Beginning balance at Dec. 29, 2019 | 1,026,765 | $ 547 | 60,747 | (145,015) | 1,110,312 | 1,026,591 | 174
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income | 36,413 |  |  |  | 36,397 | 36,397 | 16
Other comprehensive income (loss) | (54,380) |  |  | (54,376) |  | (54,376) | (4)
Distributions paid to noncontrolling interests | (56) |  |  |  |  |  | (56)
Cash dividends per common share | (8,224) |  |  |  | (8,224) | (8,224) |
Stock-based compensation | 4,955 |  | 4,955 |  |  | 4,955 |
Restricted & performance shares released (in shares) |  | 30,000 |  |  |  |  |
Restricted & performance shares released | (280) | $ 1 | (281) |  |  | (280) |
Stock options exercised (in shares) |  | 215,000 |  |  |  |  |
Stock options exercised | 6,513 | $ 2 | 6,511 |  |  | 6,513 |
Stock repurchases (in shares) |  | (831,000) |  |  |  |  |
Stock repurchases | (61,468) | $ (9) | (61,459) |  |  | (61,468) |
Ending balance (in shares) at Mar. 29, 2020 |  | 54,142,000 |  |  |  |  |
Ending balance at Mar. 29, 2020 | $ 950,238 | $ 541 | $ 10,473 | $ (199,391) | $ 1,138,485 | $ 950,108 | $ 130

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568740-111683 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4I -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4590271-111686 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=108774443&loc=SL4568447-111683 + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | instant