Leases, Balance Sheet Components (Details) $ in Thousands	Aug. 31, 2020 USD ($)
Assets:
Operating assets	$ 114,905
Finance assets	50,642
Total leased assets	165,547
Operating lease liabilities:
Current	27,604
Long-term	95,810
Total operating lease liabilities	$ 123,414
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance lease liabilities:
Current	$ 14,373
Long-term	35,851
Total finance lease liabilities	50,224
Total lease liabilities	$ 173,638