Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2023	Aug. 31, 2022
Disaggregation Of Revenue [Line Items]
Unsatisfied performance obligation amount	$ 1.5	$ 2.0
Revenue recognized	27.7
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	1.3	0.9
Other Current and Noncurrent Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 20.5	$ 30.6