Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2023	Nov. 30, 2022	Aug. 31, 2023
Disaggregation Of Revenue [Line Items]
Unsatisfied performance obligation amount	$ 1.4
Revenue recognized	7.9	$ 17.9
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	0.7	1.1	$ 1.3
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 21.7	$ 27.5	$ 20.5