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Postretirement and Other Employee Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Nov. 30, 2014
Pension and Other Postretirement Benefits Disclosure [Line Items]  
Contributions to defined benefit pension plans $ 0.9us-gaap_DefinedBenefitPlanContributionsByEmployer
Minimum  
Pension and Other Postretirement Benefits Disclosure [Line Items]  
Expected cash contributions to funded pension plans during the fiscal year ended August 31, 2015 3.5us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum  
Pension and Other Postretirement Benefits Disclosure [Line Items]  
Expected cash contributions to funded pension plans during the fiscal year ended August 31, 2015 $ 4.3us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MaximumMember