Debt - Schedule of Long-term Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	[1]	$ 2,566	$ 4,053
Long term debt		$ 25,000	521,467
Line of Credit
Debt Instrument [Line Items]
Credit facility maturity date		Jan. 03, 2028
Secured Debt
Debt Instrument [Line Items]
Long term debt maturity repayments year two		$ 25,000
Long term debt maturity repayments year three		25,000
Long term debt maturity repayments year four		418,700
Long term debt		21,900
Senior Notes
Debt Instrument [Line Items]
Long term debt		499,600
Other Current Assets | Line of Credit
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		2,700	2,300
Other Noncurrent Assets | Line of Credit
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		3,300	$ 5,200
Current portion of long-term debt | Senior Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		400
Long-term Debt
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		$ 3,600

[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.