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Leases - Supplemental Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Assets:      
Operating lease assets $ 140,296   $ 144,663
Finance lease assets 225   257
Total leased assets $ 140,521   $ 144,920
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization   us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Current      
Operating lease liabilities $ 20,357   $ 23,666
Finance lease liabilities 130   129
Noncurrent      
Operating lease liabilities 132,175   134,089
Financing obligation 98   131
Total lease liabilities $ 152,760   $ 158,015
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent   us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent   us-gaap:OtherLiabilitiesNoncurrent
Finance lease, accumulated amortization $ 100   $ 100
Non-cash activity related to lease liabilities:      
Lease assets obtained in exchange for new operating lease liabilities (1) 78 $ 148,790  
Leases assets obtained in exchange for new finance lease liabilities $ 0 $ 0  
Weighted-average remaining lease term (in years):      
Weighted-average remaining lease term, operating leases 10 years 5 months 26 days 8 years 7 months 13 days  
Weighted-average remaining lease term, finance leases 1 year 9 months 21 days 0 years  
Weighted average discount rate:      
Weighted average discount rate, operating leases 4.52% 4.14%  
Weighted average discount rate, finance leases 3.08% 0.00%