OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2026	Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net of tax	$ 4,515	$ 2,174	$ 4,552	$ 12,446	$ 2,417	$ (17,699)
Accumulated other comprehensive loss released upon disposition of business, net of tax	36,249
Total other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	5,498			12,387			$ 12,499	$ (2,236)
Tax	(983)			59			(1,258)	(600)
Net of tax	4,515	$ 2,174	$ 4,552	12,446	$ 2,417	$ (17,699)	11,241	(2,836)
Accumulated other comprehensive loss released upon disposition of business, pre-tax	40,614			0			40,614	0
Accumulated other comprehensive loss released upon disposition of business, tax	(4,365)			0			(4,365)	0
Accumulated other comprehensive loss released upon disposition of business, net of tax	36,249			0			36,249	0
Total change in Accumulated other comprehensive income (loss), pre-tax	46,112			12,387			53,113	(2,236)
Total change in Accumulated other comprehensive income (loss), tax	(5,348)			59			(5,623)	(600)
Total change in Accumulated other comprehensive income (loss), net of tax	40,764			12,446			47,490	(2,836)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1,546			12,244			6,167	(4,804)
Tax	0			0			0	0
Net of tax	1,546			12,244			6,167	(4,804)
Total change in Accumulated other comprehensive income (loss), net of tax	19,830						19,830
Pension and other defined benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	2,244			1,136			7,124	1,890
Tax	(471)			(239)			(1,496)	(397)
Net of tax	1,773			897			5,628	1,493
Total change in Accumulated other comprehensive income (loss), net of tax	16,419						16,419
Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Pre-tax	1,708			(993)			(792)	678
Tax	(512)			298			238	(203)
Net of tax	$ 1,196			$ (695)			$ (554)	$ 475