Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	Aug. 31, 2018
Leases
Package of practical expedients	true
Assets
Operating leas e right-of-use asset	$ 8,821
Current (accrued expense)	$ 1,865
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesMember
Operating lease long-term liabilities	$ 6,395
Total lease liability	8,260
Rental expense	$ 3,783
Rental expense		$ 3,734	$ 3,114