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Leases - Additional balance sheet information (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
ASSETS    
Operating lease assets $ 669,390 $ 652,115
Balance Sheet classification of operating lease assets us-gaap:OperatingLeaseRightOfUseAsset us-gaap:OperatingLeaseRightOfUseAsset
Finance lease assets $ 35,000 $ 29,100
Balance Sheet classification of finance lease assets us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Total lease assets $ 704,400 $ 681,200
Current:    
Operating lease liabilities $ 172,100 $ 168,400
Balance Sheet classification of operating lease liabilities us-gaap:AccruedLiabilitiesCurrent us-gaap:AccruedLiabilitiesCurrent
Finance lease liabilities $ 12,400 $ 9,800
Balance Sheet classification of finance lease liabilities us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent us-gaap:LongTermDebtAndCapitalLeaseObligationsCurrent
Total current lease liabilities $ 184,500 $ 178,200
Operating lease liabilities $ 752,769 $ 745,287
Balance Sheet classification of operating lease liabilities us-gaap:OperatingLeaseLiabilityNoncurrent us-gaap:OperatingLeaseLiabilityNoncurrent
Finance lease liabilities $ 26,900 $ 22,000
Balance Sheet classification of finance lease liabilities us-gaap:LongTermDebtAndCapitalLeaseObligations us-gaap:LongTermDebtAndCapitalLeaseObligations
Total non-current lease liabilities $ 779,700 $ 767,300
Weighted average remaining lease term (in years):    
Operating leases 7 years 2 months 12 days 7 years 3 months 18 days
Finance leases 3 years 6 months 3 years 3 months 18 days
Weighted average discount rates:    
Operating leases 4.50% 4.60%
Finance leases 4.60% 4.70%