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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%

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