Debt - Schedule of Long-term Debt Obligations (Parenthetical) (Details) - USD ($) $ in Thousands		6 Months Ended
		Mar. 31, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense	[1]	$ 5,134	$ 6,215
Long term debt		514,677	9,375
Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 499,100
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 one		$ 6,300
Long term debt maturity repayments year two		21,900
Long term debt maturity repayments year three		25,000
Long term debt maturity repayments year four		25,000
Long term debt maturity repayments year five		418,700
Long term debt		15,600	9,400
Other Current Assets | Line of Credit
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		2,300	2,300
Other Noncurrent Assets | Line of Credit
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		6,400	$ 7,500
Current portion of long-term debt | Senior Notes
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		900
Long-term Debt
Debt Instrument [Line Items]
Unamortized Debt Issuance Expense		$ 4,200

[1] Of the unamortized debt issuance costs for the senior notes, $0.9 million was included in Current portion of long-term debt and $4.2 million was included in Long-term debt on the Consolidated Balance Sheet as of March 31, 2024. As of September 30, 2023, all unamortized debt issuance costs for the senior notes were included in Long-term debt on the Consolidated Balance Sheet.