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Commitments And Contingencies (Details) (USD $)	3 Months Ended		12 Months Ended
	Nov. 30, 2014	Nov. 30, 2013	Aug. 31, 2012	Aug. 31, 2014
Commitments And Contingencies [Abstract]
Environmental remediation expense		$ 0us-gaap_EnvironmentalRemediationExpense	$ 7,200,000us-gaap_EnvironmentalRemediationExpense
Environmental remediation, incremental costs	1,500,000us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates
Other current liabilities	1,403,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent	1,516,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent		1,370,000us-gaap_AccruedEnvironmentalLossContingenciesCurrent
Other noncurrent liabilities	6,475,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent	5,200,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent		5,025,000us-gaap_AccruedEnvironmentalLossContingenciesNoncurrent
Total environmental remediation liabilities	$ 7,878,000us-gaap_AccrualForEnvironmentalLossContingenciesGross	$ 6,716,000us-gaap_AccrualForEnvironmentalLossContingenciesGross		$ 6,395,000us-gaap_AccrualForEnvironmentalLossContingenciesGross

X

- Definition

Undiscounted amount of the accrual for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

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- Definition

The Increase or Decrease in the accrual for environmental loss in the period from revisions in estimates to existing obligations. The amount does not relate to changes in the environmental accrual related to business acquisitions or divestitures, or to currency movements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer.

+ References

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-Name Accounting Standards Codification

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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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