CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Statement of Comprehensive Income [Abstract]
Consolidated net loss	$ (108,885)	$ (104,902)
Foreign currency translation	965	4,940
Cumulative currency translation realized through sale of subsidiary	0	762
Defined benefit plans:
Actuarial loss, net of tax	0	(28)
Other	188	(219)
Foreign currency translation	(71)	375
Other comprehensive income, net of tax	1,082	5,830
Consolidated comprehensive loss	(107,803)	(99,072)
Less: Comprehensive income (loss) attributable to non-controlling interests	(440)	238
Comprehensive loss attributable to common stockholders	$ (107,363)	$ (99,310)