Fair Value of Financial Instruments - Summary of Outstanding Non US Dollar on Credit Facility (Details) $ in Thousands, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Mar. 31, 2025 USD ($)	Mar. 31, 2025 USD ($)	Sep. 30, 2024 USD ($)	Mar. 31, 2025 CAD ($)	Sep. 30, 2024 CAD ($)
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]
Amount Borrowed	$ 273,790	$ 273,790	$ 443,880
Borrowing Cost	273,855	273,855	443,855
Prior Credit Facility
Net Change In Fair Value On Foreign Currency Translation On Outstanding Borrowings [Line Items]
Amount Borrowed				$ 2,000	$ 2,000
Borrowing Cost	1,455	1,455	1,455
Current Value	$ 1,390	1,390	$ 1,481
Reset Date	Apr. 01, 2025		Oct. 01, 2024
Unrealized appreciation (depreciation)		$ 65	$ (26)

- 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.

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