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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Aug. 31, 2019
Disaggregation Of Revenue [Line Items]
Unsatisfied performance obligation amount	$ 11.3
Revenue recognized	6.5	$ 6.4
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	1.2	1.2	$ 0.9
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 21.3	$ 14.7	$ 19.6

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Contract with customer unsatisfied performance obligation amount.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (a)
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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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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