Leases (Details) $ in Thousands	9 Months Ended
	May 31, 2020 USD ($)
Leases
Package of practical expedients	true
Assets
Operating lease right-of-use asset (Note 8)	$ 8,658
Current (accrued expense)	$ 1,965
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Us-gaap:AccruedLiabilitiesMember
Operating lease long-term liabilities	$ 6,157
Present value of lease liabilities	$ 8,122