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Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024 | Feb. 13, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 1,200,000 | $ 1,752,625 |
Unamortized debt issuance costs for the senior notes | [1] | (2,566) | (4,053) |
Total debt, net of issuance costs | [2] | 1,197,434 | 1,748,572 |
4.000% Senior Notes Due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  |  |  | $ 500,000
3.625% Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  |  |  | $ 500,000
Long-term Debt | Revolver Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payment to credit facility revolver | [3],[4] | 231,250 | 262,000 |
Long-term Debt | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payment to credit facility revolver | [3],[4] | 468,750 | 490,625 |
Long-term Debt | 4.000% Senior Notes Due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  | 500,000 | 500,000 |
Long-term Debt | 3.625% Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  | $ 0 | $ 500,000 |
[1] | As of September 30, 2025, all unamortized debt issuance costs for the senior notes were included in Long-term debt on the Consolidated Balance Sheet. As of September 30, 2024, $0.4 million of unamortized debt issuance costs for the senior notes was included in Current portion of long-term debt and $3.6 million was included in Long-term debt on the Consolidated Balance Sheet.
[2] | As of September 30, 2025, $25.0 million of debt associated with the credit facility term loan was classified as short term. As of September 30, 2024, $521.5 million of debt was classified as short term, including $499.6 million associated with the 2025 senior notes and related debt issuance costs and $21.9 million associated with the credit facility term loan.
[3] | The stated maturity date under the credit facility on which both the revolver line and the term loan will mature and all amounts then outstanding will become due and payable is January 3, 2028. The term loan began amortizing in March 2024, with payments remaining of $25.0 million in 2026 and 2027, and $418.7 million in 2028.
[4] | Unamortized debt issuance costs related to the credit facility were $2.7 million included in Other current assets and $3.3 million included in Other assets on the Consolidated Balance Sheet as of September 30, 2025 and $2.3 million included in Other current assets and $5.2 million included in Other assets on the Consolidated Balance Sheet as of September 30, 2024.

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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