OTHER COMPREHENSIVE INCOME (LOSS) - Amounts Reclassified from AOCI (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2022	Mar. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes from continuing operations	$ 83,104		$ 29,201		$ 107,327	$ 66,339
Tax benefit (expense)	(24,533)		(11,082)		(31,851)	(22,790)
Net income	65,689	$ 19,298	17,112	$ 29,500	84,987	46,612
Accumulated other comprehensive income (loss), attributable to parent | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes from continuing operations	539		(3,314)		1,227	(5,545)
Tax benefit (expense)	(113)		696		(257)	1,165
Net income	426		(2,618)		970	(4,380)
Pension and other defined benefit plans | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes from continuing operations	(845)		(1,573)		(1,690)	(3,146)
Cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income before taxes from continuing operations	$ 1,384		$ (1,741)		$ 2,917	$ (2,399)