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Leases - ROU Assets and Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Assets    
Finance leases $ 42,064 $ 44,748
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Public Utilities, Property, Plant and Equipment, Net Public Utilities, Property, Plant and Equipment, Net
Operating leases $ 293,934 $ 249,556
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Deferred charges and other assets Deferred charges and other assets
Total right-of-use assets $ 335,998 $ 294,304
Current    
Finance leases $ 1,775 $ 1,651
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Current maturities of long-term debt Current maturities of long-term debt
Operating leases $ 45,010 $ 34,340
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Other current liabilities Other current liabilities
Noncurrent    
Finance leases $ 45,459 $ 47,239
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term debt Long-term debt
Operating leases $ 262,549 $ 224,498
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Deferred credits and other liabilities Deferred credits and other liabilities
Total $ 354,793 $ 307,728