CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Consolidated net income (loss)	$ 365	$ (3,556)	$ (96,196)	$ (93,631)
Foreign currency translation	(392)	(2,851)	5,651	(3,718)
Defined benefit plans:
Pension cost amortization	(55)	173	(163)	403
Foreign currency translation	137	0	404	0
Other comprehensive (loss) income, net of tax	(310)	(2,678)	5,892	(3,315)
Consolidated comprehensive income (loss)	55	(6,234)	(90,304)	(96,946)
Less: Comprehensive (loss) income attributable to non-controlling interests	(1,475)	172	(719)	(769)
Comprehensive income (loss) attributable to common stockholders	$ 1,530	$ (6,406)	$ (89,585)	$ (96,177)