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Leases - Supplemental Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Assets:      
Operating lease assets $ 144,663 $ 0  
Finance lease assets 257    
Total leased assets $ 144,920    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization    
Liabilities:      
Operating lease liabilities $ 23,666 0  
Finance lease liabilities 129    
Long-term lease liabilities 134,089    
Finance lease liabilities 131    
Total lease liabilities $ 158,015    
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent    
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent    
Finance lease, accumulated amortization $ 100    
Cash paid for amounts included in the measurement of lease liabilities:      
Operating cash flows from operating leases 25,617    
Operating cash flows from finance leases 7    
Financing cash flows from finance leases 99 $ 1,319 $ 1,107
Non-cash activity related to lease liabilities:      
Lease assets obtained in exchange for new operating lease liabilities 20,321    
Leases assets obtained in exchange for new finance lease liabilities $ 215    
Weighted-average remaining lease term (in years):      
Weighted-average remaining lease term, operating leases 9 years 4 months 2 days    
Weighted-average remaining lease term, finance leases 2 years 18 days    
Weighted average discount rate:      
Weighted average discount rate, operating leases 4.37%    
Weighted average discount rate, finance leases 3.08%