Variable Interest Entity - Maturities of the Securitized Long-term Debt and Amortization Expense to the Securitized Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Maturities of Long-Term Debt [Abstract]
2024	$ 0
2025	0
2026	10,000
2027	500,000
2028	150,000
Thereafter	5,900,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Total	92,202	$ 0
Variable Interest Entity, Primary Beneficiary \| AEK
Maturities of Long-Term Debt [Abstract]
2024	9,922
2025	8,207
2026	8,635
2027	9,086
2028	9,561
Thereafter	49,589
Total	95,000
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
2024	8,159
2025	8,207
2026	8,635
2027	9,086
2028	9,561
Thereafter	48,554
Total	$ 92,202

Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

No definition available.