Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Feb. 28, 2019	Feb. 28, 2019	Aug. 31, 2018
Deferred revenue	$ 48.4	$ 48.4	$ 52.9
Other long-term liabilities	3.2	3.2	1.0
Remaining performance obligations	$ 64.5	$ 64.5
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	2.3	2.3
Obtain Revenue Contracts [Member] \| Two Quarters [Member]
Capitalized contract cost	3.8	3.8
Selling, General, And Administrative Expense [Member]
Capitalized contract cost, amortized	2.2	4.8
Subscription [Member]
Deferred revenue	39.6	39.6	$ 48.4
Deferred revenue recognized	$ 14.0	$ 30.1

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