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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Paid-in- Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2017 |  | 30,243 |  |  |  |
Beginning Balance at Sep. 30, 2017 | $ 466,183 | $ 302 | $ 1,195,431 | $ (2,301,097) | $ 1,638,042 | $ (66,495)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation | 74,814 |  | 74,814 |  |  |
Issuance of treasury stock under employee stock plans (in shares) |  | 633 |  |  |  |
Issuance of treasury stock under employee stock plans | (33,181) | $ 7 | (59,194) | 26,006 |  |
Repurchases of common stock (in shares) |  | (1,861) |  |  |  |
Repurchases of common stock | (336,935) | $ (19) |  | (336,916) |  |
Net income | 126,482 |  |  |  | 126,482 |
Foreign currency translation adjustments | (9,926) |  |  |  |  | (9,926)
Ending Balance (in shares) at Sep. 30, 2018 |  | 29,015 |  |  |  |
Ending Balance at Sep. 30, 2018 | 287,437 | $ 290 | 1,211,051 | (2,612,007) | 1,764,524 | (76,421)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation | 82,973 |  | 82,973 |  |  |
Issuance of treasury stock under employee stock plans (in shares) |  | 854 |  |  |  |
Issuance of treasury stock under employee stock plans | (30,209) | $ 8 | (68,659) | 38,442 |  |
Repurchases of common stock (in shares) |  | (925) |  |  |  |
Repurchases of common stock | (228,894) | $ (9) |  | (228,885) |  |
Net income | 192,124 |  |  |  | 192,124 |
Foreign currency translation adjustments | (13,664) |  |  |  |  | (13,664)
Ending Balance (in shares) at Sep. 30, 2019 |  | 28,944 |  |  |  |
Ending Balance at Sep. 30, 2019 | 289,767 | $ 289 | 1,225,365 | (2,802,450) | 1,956,648 | (90,085)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Share-based compensation | 93,681 |  | 93,681 |  |  |
Issuance of treasury stock under employee stock plans (in shares) |  | 827 |  |  |  |
Issuance of treasury stock under employee stock plans | (60,644) | $ 9 | (100,463) | 39,810 |  |
Repurchases of common stock (in shares) |  | (675) |  |  |  |
Repurchases of common stock | (235,223) | $ (7) |  | (235,216) |  |
Net income | 236,411 |  |  |  | 236,411 |
Foreign currency translation adjustments | 7,090 |  |  |  |  | 7,090
Ending Balance (in shares) at Sep. 30, 2020 |  | 29,096 |  |  |  |
Ending Balance at Sep. 30, 2020 | $ 331,082 | $ 291 | $ 1,218,583 | $ (2,997,856) | $ 2,193,059 | $ (82,995)

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