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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Deferred revenue $ 88.6 $ 68.9
Remaining performance obligations 127.4  
Consideration paid for amendment to the license agreement   $ 3.2
Remainder initial term of license agreement   30 years
Other Long-Term Liabilities [Member]    
Deferred revenue $ 2.7 $ 2.2
Minimum [Member]    
Receivables collection period 30 days  
Maximum [Member]    
Receivables collection period 150 days  
Direct Sales Commissions [Member]    
Capitalized contract cost $ 12.1 9.7
Direct Sales Commissions [Member] | Other Current Assets [Member]    
Capitalized contract cost 11.0 8.9
Direct Sales Commissions [Member] | Other Long-Term Liabilities [Member]    
Capitalized contract cost 1.1 0.8
Obtain Revenue Contracts [Member]    
Capitalized contract cost 16.9  
Selling, General, And Administrative Expense [Member]    
Capitalized contract cost, amortized 14.5  
Subscription Offerings [Member]    
Deferred revenue 77.0 60.6
Subscription [Member]    
Deferred revenue recognized $ 99.5 $ 86.5