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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	May 31, 2019	Aug. 31, 2018
Disaggregation Of Revenue [Line Items]
Unsatisfied performance obligation amount	$ 1.6
Contract assets		$ 0.5
Revenue recognized	0.8
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASC Topic 606 [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	1.1
Other Current Assets [Member]
Disaggregation Of Revenue [Line Items]
Contract assets	1.4
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 13.1	$ 8.2

X

- Definition

Contract with customer unsatisfied performance obligation amount.

+ References

No definition available.

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X

- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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- Definition

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+ References

No definition available.

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