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Post Retirement Benefit Plans - Summary of Healthcare Cost Trend Rates on Gross Eligible Charges (Detail) (Pension Plans, Defined Benefit [Member])
12 Months Ended
Oct. 31, 2014
Pension Plans, Defined Benefit [Member]
 
Pension Plans, Postretirement and Other Employee Benefits [Line Items]  
Current trend rate 7.50%us-gaap_DefinedBenefitPlanHealthCareCostTrendRateAssumedForNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Ultimate trend rate 5.20%us-gaap_DefinedBenefitPlanUltimateHealthCareCostTrendRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Year ultimate trend rate reached 2026