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Leases (Lease Assets and Liabilities) (Details)
$ in Thousands
Aug. 31, 2020
USD ($)
Assets  
Operating lease assets $ 362,847
Finance lease assets 160,015
Total lease assets 522,862
Current  
Operating lease liabilities 110,723
Finance lease liabilities 7,465
Non-current  
Operating lease liabilities 302,035
Finance lease liabilities 160,747
Total lease liabilities 580,970
Operating lease assets, accumulated amortization 96,200
Finance lease assets, accumulated amortization $ 12,800