Impairment and Other Charges (Credits), Net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost And Reserve [Line Items]
Sublease Income	$ 958	$ 1,436	$ 4,749
Restructuring and other charges (credits), net	$ 15,643	$ (802)	$ (460)