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Consolidated Statements of Stockholder's Equity - USD ($) $ in Thousands | Total | Previously Reported | Cash Flow Hedging | Net Investment Hedging | Common Stock | Additional Paid-in Capital | Retained Earnings (Accumulated Deficit) | Retained Earnings (Accumulated Deficit) Previously Reported | Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Cash Flow Hedging | Accumulated Other Comprehensive Loss Net Investment Hedging
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Sep. 30, 2018 | $ 874,589 |  |  |  | $ 1,180 | $ 1,558,403 | $ (599,409) |  | $ (85,585) |  |
Beginning balance (Accounting Standards Update 2016-16) at Sep. 30, 2018 |  | $ 72,261 |  |  |  |  |  | $ 72,261 |  |  |
Beginning balance (Accounting Standards Update 2014-09) at Sep. 30, 2018 |  | 363,218 |  |  |  |  |  | 363,218 |  |  |
Beginning balance (in shares) at Sep. 30, 2018 |  |  |  |  | 117,981,000 |  |  |  |  |  |
Common stock issued for employee stock-based awards |  |  |  |  | $ 15 | (15) |  |  |  |  |
Common stock issued for employee stock-based awards (in shares) |  |  |  |  | 1,495,000 |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards | (44,366) |  |  |  | $ (5) | (44,361) |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards (in shares) |  |  |  |  | (504,000) |  |  |  |  |  |
Common stock issued | (140) |  |  |  |  | (140) |  |  |  |  |
Common stock issued for employee stock purchase plan | 17,615 |  |  |  | $ 3 | 17,612 |  |  |  |  |
Common stock issued for employee stock purchase plan (in shares) |  |  |  |  | 275,000 |  |  |  |  |  |
Compensation expense from stock-based awards | 86,400 |  |  |  |  | 86,400 |  |  |  |  |
Net income (loss) | (27,460) |  |  |  |  |  | (27,460) |  |  |  |
Repurchases of common stock | $ (114,994) |  |  |  | $ (44) | (114,950) |  |  |  |  |
Repurchases of common stock (in shares) | (1,400,000) |  |  |  | (4,348,000) |  |  |  |  |  |
Unrealized gain (loss) on hedging instruments, net of tax |  |  | $ (385) | $ 5,087 |  |  |  |  |  | $ (385) | $ 5,087
Foreign currency translation adjustment | $ (24,755) |  |  |  |  |  |  |  | (24,755) |  |
Unrealized gain (loss) on available-for-sale securities, net of tax | 530 |  |  |  |  |  |  |  | 530 |  |
Change in pension benefits, net of tax | (5,602) |  |  |  |  |  |  |  | (5,602) |  |
Ending balance at Sep. 30, 2019 | 1,201,998 |  |  |  | $ 1,149 | 1,502,949 | (191,390) |  | (110,710) |  |
Ending balance (Accounting Standards Update 2016-02) at Sep. 30, 2019 |  | $ (1,572) |  |  |  |  |  | $ (1,572) |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  |  |  |  | 114,899,000 |  |  |  |  |  |
Common stock issued for employee stock-based awards |  |  |  |  | $ 14 | (14) |  |  |  |  |
Common stock issued for employee stock-based awards (in shares) |  |  |  |  | 1,392,000 |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards | (33,740) |  |  |  | $ (4) | (33,736) |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards (in shares) |  |  |  |  | (455,000) |  |  |  |  |  |
Common stock issued for employee stock purchase plan | 18,382 |  |  |  | $ 2 | 18,380 |  |  |  |  |
Common stock issued for employee stock purchase plan (in shares) |  |  |  |  | 289,000 |  |  |  |  |  |
Compensation expense from stock-based awards | 115,149 |  |  |  |  | 115,149 |  |  |  |  |
Net income (loss) | $ 130,695 |  |  |  |  |  | 130,695 |  |  |  |
Repurchases of common stock (in shares) | 0 |  |  |  |  |  |  |  |  |  |
Unrealized gain (loss) on hedging instruments, net of tax |  |  |  | (13,242) |  |  |  |  |  |  | (13,242)
Foreign currency translation adjustment | $ 22,076 |  |  |  |  |  |  |  | 22,076 |  |
Unrealized gain (loss) on available-for-sale securities, net of tax | 188 |  |  |  |  |  |  |  | 188 |  |
Change in pension benefits, net of tax | (1,686) |  |  |  |  |  |  |  | (1,686) |  |
Ending balance at Sep. 30, 2020 | $ 1,438,248 |  |  |  | $ 1,161 | 1,602,728 | (62,267) |  | (103,374) |  |
Ending balance (in shares) at Sep. 30, 2020 | 116,125,000 |  |  |  | 116,125,000 |  |  |  |  |  |
Common stock issued for employee stock-based awards |  |  |  |  | $ 15 | (15) |  |  |  |  |
Common stock issued for employee stock-based awards (in shares) |  |  |  |  | 1,490,000 |  |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards | $ (53,077) |  |  |  | $ (4) | (53,073) |  |  |  |  |
Shares surrendered by employees to pay taxes related to stock-based awards (in shares) |  |  |  |  | (466,000) |  |  |  |  |  |
Common stock issued for employee stock purchase plan | 21,575 |  |  |  | $ 2 | 21,573 |  |  |  |  |
Common stock issued for employee stock purchase plan (in shares) |  |  |  |  | 240,000 |  |  |  |  |  |
Compensation expense from stock-based awards | 177,289 |  |  |  |  | 177,289 |  |  |  |  |
Net income (loss) | 476,923 |  |  |  |  |  | 476,923 |  |  |  |
Repurchases of common stock | $ (30,000) |  |  |  | $ (2) | (29,998) |  |  |  |  |
Repurchases of common stock (in shares) | (200,000) |  |  |  | (226,000) |  |  |  |  |  |
Unrealized gain (loss) on hedging instruments, net of tax |  |  |  | $ 1,248 |  |  |  |  |  |  | $ 1,248
Foreign currency translation adjustment | $ 1,613 |  |  |  |  |  |  |  | 1,613 |  |
Unrealized gain (loss) on available-for-sale securities, net of tax | (307) |  |  |  |  |  |  |  | (307) |  |
Change in pension benefits, net of tax | 4,956 |  |  |  |  |  |  |  | 4,956 |  |
Ending balance at Sep. 30, 2021 | $ 2,038,468 |  |  |  | $ 1,172 | $ 1,718,504 | $ 414,656 |  | $ (95,864) |  |
Ending balance (in shares) at Sep. 30, 2021 | 117,163,000 |  |  |  | 117,163,000 |  |  |  |  |  |

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