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Stockholders' Equity | 6 Months Ended
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Mar. 31, 2024
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | 9. Stockholders’ Equity Share Repurchases During the three months ended March 31, 2024, the Company repurchased 1.2 million shares of common stock for $73.9 million (excluding fees, commissions, and excise tax) pursuant to the 2022 share repurchase authorization. During the six months ended March 31, 2024, the Company repurchased 3.5 million shares of common stock for $186.8 million (excluding fees, commissions, and excise tax) pursuant to the 2022 share repurchase authorization. As of March 31, 2024, the Company accrued $1.7 million for excise tax related to share repurchases, which is considered an additional cost of the share repurchases and a reduction to stockholders’ equity in the Condensed Consolidated Balance Sheets. ​ Accumulated Other Comprehensive Income (Loss) ​ The following is a summary of the components of accumulated other comprehensive income (loss), net of tax for the six months ended March 31, 2024 and 2023 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains (Losses) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | on Available- | ​ | ​ | ​ | Pension | ​ | ​ | ​
​ | ​ | Currency | ​ | for-Sale | ​ | Gains (Losses) | ​ | Liability | ​ |  | ​
​ | ​ | Translation | ​ | Securities | ​ | on Derivative asset | ​ | Adjustments | ​ |  | ​
​ | ​ | Adjustments | ​ | Net of tax | ​ | Net of tax | ​ | Net of tax | ​ | Total
Balance at September 30, 2022 | ​ | $ | (165,694) | ​ | $ | (10,909) | ​ | $ | 93,020 | ​ | $ | (333) | ​ | $ | (83,916)
Other comprehensive income (loss) before reclassifications | ​ | ​ | 111,264 | ​ | ​ | 4,042 | ​ | ​ | (70,260) | ​ | ​ | — | ​ | ​ | 45,046
Balance at March 31, 2023 | ​ | $ | (54,430) | ​ | $ | (6,867) | ​ | $ | 22,760 | ​ | $ | (333) | ​ | $ | (38,870)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
​ | ​ | ​ | ​ | ​ | Gains (Losses) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | on Available- | ​ | ​ | ​ | ​ | Pension | ​ | ​ | ​
​ | ​ | Currency | ​ | for-Sale | ​ | Gains (Losses) | ​ | Liability | ​ | ​ | ​
​ | ​ | Translation | ​ | Securities | ​ | on Derivative asset | ​ | Adjustments | ​ | ​ | ​
​ | ​ | Adjustments | ​ | Net of tax | ​ | Net of tax | ​ | Net of tax | ​ | ​ | Total
Balance at September 30, 2023 | ​ | $ | (88,448) | ​ | $ | (5,135) | ​ | $ | 31,487 | ​ | $ | (330) | ​ | $ | (62,426)
Other comprehensive income (loss) before reclassifications | ​ | ​ | 25,725 | ​ | ​ | 3,276 | ​ | ​ | (8,288) | ​ | ​ | (61) | ​ | ​ | 20,652
Amounts reclassified from accumulated other comprehensive income (loss) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 46 | ​ | ​ | 46
Balance at March 31, 2024 | ​ | $ | (62,723) | ​ | $ | (1,859) | ​ | $ | 23,199 | ​ | $ | (345) | ​ | $ | (41,728)
​ ​ 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 2, Summary of Significant Accounting Policies in the notes to the audited consolidated financial statements included in the section titled “Financial Statements and Supplementary Data” in Part II, Item 8 of the 2023 Annual Report on Form 10-K. Amounts reclassified from “Accumulated other comprehensive income (loss)” related to pension liability adjustments represent amortization of actuarial gains and losses.

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