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Pension Plan - Company's Target Asset Allocation Percentage, by Asset Class (Detail)
 12 Months Ended
Feb. 28, 2015
Minimum [Member] | Cash [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentage 1.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Fixed Income [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentage 35.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Minimum [Member] | Equity Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentage 45.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member] | Cash [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentage 5.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Fixed Income [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentage 55.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_FixedIncomeFundsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Maximum [Member] | Equity Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Target Allocation Percentage 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_EquitySecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember