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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
May 31, 2021
May 31, 2021
Aug. 31, 2020
Deferred revenue $ 64.8 $ 64.8 $ 68.9
Other long-term liabilities 1.5 1.5 2.2
Remaining performance obligations 96.6 96.6  
Subscription Offerings [Member]      
Deferred revenue 55.3 55.3 $ 60.6
Subscription [Member]      
Deferred revenue recognized $ 25.9 $ 70.5