CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (17,577)	$ (26,087)	$ (60,073)	$ (89,994)
Foreign currency translation	2,385	(284)	1,375	133
Defined benefit plan:
Pension cost amortization	71	47	206	140
Foreign currency translation	53	(76)	(220)	(146)
Other comprehensive income (loss), net of tax	2,509	(313)	1,361	127
Consolidated comprehensive loss	(15,068)	(26,400)	(58,712)	(89,867)
Less: Comprehensive loss attributable to non-controlling interests	0	0	0	(440)
Comprehensive loss attributable to common stockholders	$ (15,068)	$ (26,400)	$ (58,712)	$ (89,427)