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Borrowings - Schedule of Debt Instrument Redemption (Details) - Senior Notes	9 Months Ended
	Jun. 30, 2026	Sep. 30, 2025
7.250%
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.25%	7.25%
7.250% | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price percentage	100.00%
7.250% | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	103.625%
7.250% | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price percentage	102.417%
7.250% | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Redemption price percentage	101.208%
7.250% | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Redemption price percentage	100.00%
7.500%
Debt Instrument [Line Items]
Stated interest rate on debt instrument	7.50%	7.50%
Redemption percentage	35.00%
Principal amount outstanding, percentage	0.65
7.500% | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price percentage	107.50%
7.500% | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	100.00%
7.500% | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price percentage	103.75%
7.500% | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Redemption price percentage	101.875%
7.500% | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Redemption price percentage	100.00%
8.000%
Debt Instrument [Line Items]
Stated interest rate on debt instrument	8.00%	8.00%
Redemption percentage	35.00%
Principal amount outstanding, percentage	0.65
8.000% | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price percentage	108.00%
8.000% | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	100.00%
8.000% | Debt Instrument, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price percentage	104.00%
8.000% | Debt Instrument, Redemption, Period Four
Debt Instrument [Line Items]
Redemption price percentage	102.00%
8.000% | Debt Instrument, Redemption, Period Five
Debt Instrument [Line Items]
Redemption price percentage	100.00%

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