OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amounts Reclassified From Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Tax benefit	$ (25,579)	$ (26,569)
Net income	64,387	70,851
Total | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss) before tax	(1,712)	99
Tax benefit	360	(21)
Net income	(1,352)	78
Pension amortization | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss) before tax	(2,310)	(636)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total gain (loss) before tax	$ 598	$ 735