Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Nov. 30, 2018	Aug. 31, 2018
Deferred revenue	$ 49.5	$ 52.9
Other long-term liabilities	3.3	1.0
Remaining performance obligations	$ 65.8
Percentage of remaining performance obligations will be recognized	75.00%
Minimum [Member]
Receivables collection period	30 days
Maximum [Member]
Receivables collection period	120 days
Direct Sales Force Commissions [Member]
Capitalized contract cost	$ 6.1
Obtain Revenue Contracts [Member]
Capitalized contract cost	1.6
Selling, General, And Administrative Expense [Member]
Capitalized contract cost, amortized	2.6
Subscription [Member]
Deferred revenue	41.4	$ 48.4
Deferred revenue recognized	$ 18.4

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