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Leases - Supplemental Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Assets:      
Operating lease assets $ 132,038 $ 159,075  
Finance lease assets $ 22 $ 94  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property and equipment, net Property and equipment, net  
Total leased assets $ 132,060 $ 159,169  
Current      
Operating lease liabilities 12,959 14,075  
Finance lease liabilities $ 23 $ 73  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other current liabilities Other current liabilities  
Noncurrent      
Operating lease liability $ 129,302 $ 153,228  
Finance lease liabilities $ 0 $ 23  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other liabilities Other liabilities  
Total lease liabilities $ 142,284 $ 167,399  
Finance lease, accumulated amortization $ 200 $ 100  
Weighted-average remaining lease term (in years):      
Operating leases 8 years 11 months 1 day 9 years 4 months 13 days  
Finance leases 3 months 29 days 1 year 3 months 25 days  
Weighted average discount rate:      
Operating leases 3.91% 4.31%  
Finance leases   3.08%  
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases $ 13,952 $ 20,469 $ 25,617
Financing cash flows from finance leases 73 119 99
Non-cash activity related to lease liabilities:      
Lease assets obtained in exchange for new operating lease liabilities 3,313 30,017 20,321
Leases assets obtained in exchange for new finance lease liabilities $ 0 $ 0 $ 215