Leases - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2023	Sep. 30, 2021	Feb. 28, 2019
Lessee Lease Description [Line Items]
Lease expiration date			2037
Payments to be received as sublease income					$ 2,900,000		$ 9,100,000
Operating right-of-use lease assets	$ 143,388,000		$ 143,388,000			$ 152,337,000
Future lease payments	$ 11,600,000		$ 11,600,000
Leases not yet commenced, Term of contract	10 years		10 years
Operating lease, liability	$ 194,836,000		$ 194,836,000
Lease Cost	10,857,000	$ 11,031,000	32,372,000	$ 33,793,000
Operating cash flows from operating leases	10,087,000	12,319,000	35,200,000	40,396,000
Facility Closures and Related Costs
Lessee Lease Description [Line Items]
Operating lease liability, net restructured facilities	700,000		700,000			$ 3,600,000
Operating right-of-use lease assets	200		200
Operating lease, liability	900,000		900,000
Operating cash flows from operating leases	700,000	$ 1,200,000	1,900,000	$ 7,500,000
Sublease Income Committed
Lessee Lease Description [Line Items]
Sublease income assumed	$ 200,000		$ 200,000