Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2020	Aug. 31, 2019
Deferred revenue	$ 68,900	$ 65,800
Remaining performance obligations	100,200
Consideration paid for amendment to the license agreement	$ 3,246
Remainder initial term of license agreement	30 years
Other Long-Term Liabilities [Member]
Other long-term liabilities	$ 2,200	3,600
Minimum [Member]
Receivables collection period	30 days
Maximum [Member]
Receivables collection period	120 days
Direct Sales Commissions [Member]
Capitalized contract cost	$ 9,700	9,000
Direct Sales Commissions [Member] | Other Current Assets [Member]
Capitalized contract cost	8,900	8,300
Direct Sales Commissions [Member] | Other Long-Term Liabilities [Member]
Capitalized contract cost	800	700
Obtain Revenue Contracts [Member]
Capitalized contract cost	13,700
Selling, General, And Administrative Expense [Member]
Capitalized contract cost, amortized	13,000
Subscription [Member]
Deferred subscription revenue previously recognized	86,500	74,700
Subscription Offering [Member]
Deferred revenue	$ 60,600	$ 58,200