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Consolidated Statements of Shareholders' Equity Statement - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | AOCI Attributable to Parent | Retained Earnings
--- | --- | --- | --- | ---
Beginning Balance (in shares) at Sep. 30, 2020 |  | 61,099 |  |
Beginning Balance at Sep. 30, 2020 | $ 2,232,268 | $ 305,453 | $ (18,716) | $ 1,945,531
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of employee stock options (in shares) |  | 130 |  |
Exercise of employee stock options | 3,810 | $ 3,810 |  |
Issuance of stock under employee stock purchase plan (in shares) |  | 543 |  |
Issuance of stock under employee stock purchase plan | 60,888 | $ 60,888 |  |
Issuance of restricted stock (in shares) |  | 1,095 |  |
Issuance of restricted stock | 0 |  |  |
Repurchase of common stock (in shares) |  | (2,501) |  |
Repurchase of common stock | (500,000) | $ (411,056) |  | (88,944)
Cost of Issuance of Treasury Stock, Shares |  | (67) |  |
Taxes paid related to net share settlement of equity awards | (10,920) | $ (10,920) |  |
Stock-based compensation | 185,819 | $ 185,819 |  |
Net income | 220,523 |  |  | 220,523
Other comprehensive loss | (219) |  | (219) |
Ending Balance ( in shares) at Jun. 30, 2021 |  | 60,299 |  |
Ending Balance at Jun. 30, 2021 | 2,192,169 | $ 133,994 | (18,935) | 2,077,110
Beginning Balance (in shares) at Mar. 31, 2021 |  | 60,052 |  |
Beginning Balance at Mar. 31, 2021 | 2,007,819 | $ 39,507 | (19,194) | 1,987,506
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of employee stock options (in shares) |  | 47 |  |
Exercise of employee stock options | 1,201 | $ 1,201 |  |
Issuance of stock under employee stock purchase plan (in shares) |  | 312 |  |
Issuance of stock under employee stock purchase plan | 34,810 | $ 34,810 |  |
Issuance of restricted stock (in shares) |  | 353 |  |
Issuance of restricted stock | 0 |  |  |
Repurchase of common stock (in shares) |  | (449) |  |
Repurchase of common stock | (100,000) | $ (100,000) |  |
Adjustments To Additional Paid In Capital, Equity Forward Contract | 100,000 | $ 100,000 |  |
Cost of Issuance of Treasury Stock, Shares |  | (16) |  |
Taxes paid related to net share settlement of equity awards | (2,992) | $ (2,992) |  |
Stock-based compensation | 61,468 | $ 61,468 |  |
Net income | 89,604 |  |  | 89,604
Other comprehensive loss | 259 |  | 259 |
Ending Balance ( in shares) at Jun. 30, 2021 |  | 60,299 |  |
Ending Balance at Jun. 30, 2021 | $ 2,192,169 | $ 133,994 | (18,935) | 2,077,110
Beginning Balance (in shares) at Sep. 30, 2021 | 60,652 | 60,652 |  |
Beginning Balance at Sep. 30, 2021 | $ 2,360,213 | $ 192,458 | (20,073) | 2,187,828
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of employee stock options (in shares) |  | 115 |  |
Exercise of employee stock options | 2,753 | $ 2,753 |  |
Issuance of stock under employee stock purchase plan (in shares) |  | 412 |  |
Issuance of stock under employee stock purchase plan | 60,927 | $ 60,927 |  |
Issuance of restricted stock (in shares) |  | 1,080 |  |
Issuance of restricted stock | 0 |  |  |
Repurchase of common stock (in shares) |  | (2,611) |  |
Repurchase of common stock | (500,023) | $ (394,141) |  | (105,882)
Cost of Issuance of Treasury Stock, Shares |  | (92) |  |
Taxes paid related to net share settlement of equity awards | (18,907) | $ (18,907) |  |
Stock-based compensation | 189,761 | $ 189,761 |  |
Net income | 232,814 |  |  | 232,814
Other comprehensive loss | $ (4,553) |  | (4,553) |
Ending Balance ( in shares) at Jun. 30, 2022 | 59,556 | 59,556 |  |
Ending Balance at Jun. 30, 2022 | $ 2,322,985 | $ 32,851 | (24,626) | 2,314,760
Beginning Balance (in shares) at Mar. 31, 2022 |  | 60,465 |  |
Beginning Balance at Mar. 31, 2022 | 2,397,128 | $ 82,133 | (22,628) | 2,337,623
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Exercise of employee stock options (in shares) |  | 19 |  |
Exercise of employee stock options | 450 | $ 450 |  |
Issuance of stock under employee stock purchase plan (in shares) |  | 243 |  |
Issuance of stock under employee stock purchase plan | 34,602 | $ 34,602 |  |
Issuance of restricted stock (in shares) |  | 305 |  |
Issuance of restricted stock | 0 |  |  |
Repurchase of common stock (in shares) |  | (1,463) |  |
Repurchase of common stock | (250,000) | $ (144,118) |  | (105,882)
Cost of Issuance of Treasury Stock, Shares |  | (13) |  |
Taxes paid related to net share settlement of equity awards | (2,091) | $ (2,091) |  |
Stock-based compensation | 61,875 | $ 61,875 |  |
Net income | 83,019 |  |  | 83,019
Other comprehensive loss | $ (1,998) |  | (1,998) |
Ending Balance ( in shares) at Jun. 30, 2022 | 59,556 | 59,556 |  |
Ending Balance at Jun. 30, 2022 | $ 2,322,985 | $ 32,851 | $ (24,626) | $ 2,314,760

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