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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	May 31, 2021	May 31, 2020	Aug. 31, 2020
Disaggregation Of Revenue [Line Items]
Unsatisfied performance obligation amount	$ 6.8
Revenue recognized	16.7	$ 13.5
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	1.5	0.8	$ 0.9
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 35.5	$ 16.9	$ 19.6

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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