Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	May 31, 2020	May 31, 2020	Aug. 31, 2019
Deferred revenue	$ 53.1	$ 53.1	$ 65.8
Other long-term liabilities	2.4	2.4	3.6
Remaining performance obligations	77.3	77.3
Subscription [Member]
Deferred revenue	43.9	43.9	$ 58.2
Deferred revenue recognized	$ 22.2	$ 64.7