Restructuring and Impairment Charges - Additional Information (Details)	12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($) position	Sep. 30, 2020 USD ($) position
Restructuring Cost and Reserve [Line Items]
Restructuring and impairment charges	$ 0	$ 7,957,000	$ 45,029,000
Impairment loss on operating lease assets	0	$ 0	28,016,000
Property, Plant and Equipment Impairment or Disposal Disclosure			$ 5,200,000
Number of positions reduced | position		160	209
Asset Impairment Charges		$ 0
Employee separation
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 7,956,000	$ 11,800,000