Leases (Lease Assets and Liabilities) (Details) $ in Thousands	May 31, 2020 USD ($)
Assets
Operating lease assets	$ 377,540
Finance lease assets	149,956
Total lease assets	527,496
Current
Operating lease liabilities	102,284
Finance lease liabilities	7,047
Non-current
Operating lease liabilities	311,939
Finance lease liabilities	155,546
Total lease liabilities	576,816
Operating lease assets, accumulated amortization	72,300
Finance lease assets, accumulated amortization	$ 11,000