Significant Accounting Policies - Revision of Prior Period Financial Statements (Details) - USD ($) $ in Thousands	Aug. 31, 2021	Aug. 31, 2020
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating lease right-of-use assets	$ 11,084	$ 12,810
Current portion of operating lease liabilities	3,096	2,653
Operating lease liabilities	$ 8,092	10,289
Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Operating lease right-of-use assets		11,512
Current portion of operating lease liabilities		2,493
Operating lease liabilities		$ 9,151