CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (48,079)	$ (9,629)	$ (63,907)	$ (96,561)
Foreign currency translation	(747)	936	417	6,043
Defined benefit plan:
Pension cost amortization	47	(54)	93	(108)
Foreign currency translation	(107)	26	(70)	267
Other comprehensive (loss) income, net of tax	(807)	908	440	6,202
Consolidated comprehensive loss	(48,886)	(8,721)	(63,467)	(90,359)
Less: Comprehensive income (loss) attributable to non-controlling interests	0	365	(440)	756
Comprehensive loss attributable to common stockholders	$ (48,886)	$ (9,086)	$ (63,027)	$ (91,115)