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Revenue Recognition (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2018	Aug. 31, 2018
Disaggregation Of Revenue [Line Items]
Unsatisfied performance obligation amount	$ 0.7
Contract assets		$ 0.5
Revenue recognized	4.6
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	1.8
Other Current Liabilities [Member]
Disaggregation Of Revenue [Line Items]
Contract liabilities	$ 6.4	$ 7.5

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- Definition

Contract with customer unsatisfied performance obligation amount.

+ References

No definition available.

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- 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
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-SubTopic 10
-Section 45
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