v3.25.2
Other Comprehensive Income (Loss) (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income tax effect $ (5,844) $ (5,277) $ (17,316) $ (15,889)
Net of income tax expense 21,150 19,610 63,884 60,283
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total reclassifications for the period (7,798) (16,371) (27,824) (51,461)
Reclassification out of Accumulated Other Comprehensive Income | Actuarial Loss        
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Nonoperating Income (Expense) 0 136 0 410
Reclassification out of Accumulated Other Comprehensive Income | Defined Benefit Plan        
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income tax effect 0 (31) 0 (95)
Net of income tax expense 0 105 0 315
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Net income tax effect 2,316 4,893 8,263 15,376
Net of income tax expense (7,798) (16,476) (27,824) (51,776)
Interest Rate Contract | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent        
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Line Items]        
Interest (income) expense, effective portion $ (10,114) $ (21,369) $ (36,087) $ (67,152)