Variable Interest Entity - Maturities of the Securitized Long-term Debt and Amortization Expense to the Securitized Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Maturities of Securitized Long-Term Debt
2025	$ 0
2026	10,000
2027	500,000
2028	150,000
2029	500,000
Thereafter	6,625,000
Amortization Expense of Securitized Intangible Asset
Total	82,844	$ 92,202
Variable Interest Entity, Primary Beneficiary
Maturities of Securitized Long-Term Debt
2025	8,207
2026	8,635
2027	9,086
2028	9,561
2029	10,060
Thereafter	39,529
Total	85,078
Amortization Expense of Securitized Intangible Asset
2025	8,090
2026	8,512
2027	8,957
2028	9,424
2029	9,916
Thereafter	37,945
Total	$ 82,844	$ 92,202