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Stockholders' Equity | 12 Months Ended
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Sep. 30, 2023
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | 13. Stockholders’ Equity Share Repurchases On November 4, 2022, the Company’s Board of Directors terminated the Company’s then existing $50.0 million share repurchase authorization and approved a new authorization to repurchase up to $1.5 billion of shares of the Company’s common stock from time to time through open market purchases or through privately negotiated transactions (including under an accelerated share repurchase (“ASR”) agreement), or by other means, including through the use of trading plans intended to qualify under Rule 10b5-1 under the Securities Exchange Act of 1934, as amended, subject to market and business conditions, legal requirements, and other factors. The repurchase authorization can be discontinued at any time. On November 23, 2022, the Company executed an ASR agreement (the “ASR Agreement”) with JPMorgan Chase Bank, National Association (the “Dealer”) to repurchase an aggregate of up to $500.0 million of the Company’s common stock. Under the terms of the ASR Agreement, the Company made a payment of $500.0 million to the Dealer on November 28, 2022 and received an initial delivery of 6.1 million shares of common stock from the Dealer, representing approximately 70% of the total shares of common stock that were expected to be repurchased under the ASR Agreement. The final number of shares repurchased by the Company was based on the average of the daily volume-weighted average price of the Company’s common stock during the term of the ASR Agreement, less a discount and subject to adjustments pursuant to the terms and conditions of the ASR Agreement. The final settlement of the transactions under the ASR Agreement occurred in April 2023, and the Company received 4.0 million additional shares of common stock from the Dealer as of the settlement date. The Company evaluated the nature of the forward contract aspect of the ASR Agreement and concluded equity classification was appropriate. The shares of common stock repurchased by the Company under the ASR Agreement were retired, accounted for as a reduction to stockholders’ equity in the Consolidated Balance Sheets, and treated as a repurchase of common stock for purposes of calculating earnings per share as of the applicable settlement date. After giving effect to the ASR Agreement, $1.0 billion of the amount authorized remained available for additional repurchases of the Company’s common stock. Following the final termination of the ASR Agreement in April 2023, other arrangements commenced under which the Company expects to repurchase up to an additional $500.0 million shares of common stock in open market purchases, subject to market and business conditions, legal requirements, and other factors. As of September 30, 2023, the Company has acquired 7.4 million shares of its common stock through open market purchases totaling $338.5 million (excluding fees, commissions, and excise tax) under these other arrangements. These shares of common stock repurchased by the Company were retired, accounted for as a reduction to stockholders’ equity in the Consolidated Balance Sheets and treated as a repurchase of common stock for purposes of calculating earnings per share as of the applicable settlement dates. Effective January 1, 2023, all corporate share repurchases are subject to a one percent excise tax on the value of the repurchase, net of share issuances, subject to certain exclusions. The excise tax was part of The Inflation Reduction Act passed by the U.S. government in 2022. The Company accrued $5.0 million for excise tax related to share repurchases settled in fiscal 2023, which is considered an additional cost of the share repurchases and a reduction to stockholders’ equity in the Consolidated Balance Sheets. Preferred Stock Total number of shares of preferred stock authorized for issuance was 1,000,000 shares at September 30, 2023 and 2022. Preferred stock has a par value of $0.01 per share and may be issued at the discretion of the Board of Directors without stockholder approval with such designations, rights and preferences as the Board of Directors may determine. There were no shares of preferred stock issued or outstanding at September 30, 2023 or 2022. Accumulated Other Comprehensive Income (Loss) The following is a summary of the components of accumulated other comprehensive income (loss), net of tax, at September 30, 2023, 2022 and 2021 (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains (Losses) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | on Available- | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Currency | ​ | for-Sale | ​ | Gains (Losses) | ​ | Pension | ​ |  | ​
​ | ​ | Translation | ​ | Securities | ​ | on Derivative asset | ​ | Liability | ​ |  | ​
​ | ​ | Adjustments | ​ | Net of tax | ​ | Net of tax | ​ | Adjustments | ​ | Total
Balance at September 30, 2020 | ​ | $ | 23,061 | ​ |  | (1) | ​ |  | — | ​ |  | (1,141) | ​ |  | 21,919
Other comprehensive income (loss) before reclassifications | ​ |  | (2,922) | ​ |  | — | ​ |  | — | ​ |  | 333 | ​ |  | (2,589)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 21 | ​ |  | 21
Balance at September 30, 2021 | ​ |  | 20,139 | ​ |  | (1) | ​ |  | — | ​ |  | (787) | ​ |  | 19,351
Other comprehensive income (loss) before reclassifications | ​ |  | (169,266) | ​ |  | (10,908) | ​ |  | 93,020 | ​ |  | 412 | ​ |  | (86,742)
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | (16,567) | ​ |  | — | ​ |  | — | ​ |  | 42 | ​ |  | (16,525)
Balance at September 30, 2022 | ​ |  | (165,694) | ​ | ​ | (10,909) | ​ | ​ | 93,020 | ​ | ​ | (333) | ​ |  | (83,916)
Other comprehensive income (loss) before reclassifications | ​ |  | 77,246 | ​ |  | 5,774 | ​ |  | (61,533) | ​ |  | (104) | ​ |  | 21,383
Amounts reclassified from accumulated other comprehensive income (loss) | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 107 | ​ |  | 107
Balance at September 30, 2023 | ​ | $ | (88,448) | ​ | $ | (5,135) | ​ | $ | 31,487 | ​ | $ | (330) | ​ | $ | (62,426)
​ Unrealized gains (losses) on available-for-sale marketable securities are reclassified from accumulated other comprehensive income (loss) into results of operations at the time of the securities’ sale, as described in Note 5, Marketable Securities. Amounts reclassified from accumulated other comprehensive income (loss) related to pension liability adjustments represent amortization of actuarial gains and losses. Defined benefit pension plan curtailments are recognized as reclassifications from accumulated other comprehensive income (loss) and corresponding reductions in pension liabilities and net pension cost. ​

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