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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2019
May 31, 2019
Aug. 31, 2018
Deferred revenue $ 48.7 $ 48.7 $ 52.9
Other long-term liabilities 3.5 3.5 1.0
Remaining performance obligations $ 63.7 $ 63.7  
Percentage of remaining performance obligations will be recognized 75.00% 75.00%  
Minimum [Member]      
Receivables collection period   30 days  
Maximum [Member]      
Receivables collection period   120 days  
Direct Sales Force Commissions [Member]      
Capitalized contract cost $ 6.2 $ 6.2  
Obtain Revenue Contracts [Member] | Quarter [Member]      
Capitalized contract cost 4.0 4.0  
Obtain Revenue Contracts [Member] | Two Quarters [Member]      
Capitalized contract cost 7.8 7.8  
Selling, General, And Administrative Expense [Member]      
Capitalized contract cost, amortized 4.0 8.8  
Subscription [Member]      
Deferred revenue 39.9 39.9 $ 48.4
Deferred revenue recognized $ 18.9 $ 55.1