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Warranty - Additional Information (Detail) (USD $)
Nov. 30, 2014
May 31, 2014
Nov. 30, 2013
May 31, 2013
Guarantor Obligations [Line Items]        
Estimated warranty obligation $ 5,738,000us-gaap_ProductWarrantyAccrual $ 5,697,000us-gaap_ProductWarrantyAccrual $ 6,155,000us-gaap_ProductWarrantyAccrual $ 5,882,000us-gaap_ProductWarrantyAccrual
Estimated warranty obligation current 3,738,000us-gaap_ProductWarrantyAccrualClassifiedCurrent 3,697,000us-gaap_ProductWarrantyAccrualClassifiedCurrent 3,955,000us-gaap_ProductWarrantyAccrualClassifiedCurrent  
Estimated warranty obligation noncurrent 2,000,000us-gaap_ProductWarrantyAccrualNoncurrent 2,000,000us-gaap_ProductWarrantyAccrualNoncurrent 2,200,000us-gaap_ProductWarrantyAccrualNoncurrent  
Recreational Vehicles [Member]        
Guarantor Obligations [Line Items]        
Estimated warranty obligation 1,300,000us-gaap_ProductWarrantyAccrual
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AutomobilesMember
  1,900,000us-gaap_ProductWarrantyAccrual
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AutomobilesMember
 
Estimated warranty obligation current 800,000us-gaap_ProductWarrantyAccrualClassifiedCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AutomobilesMember
  1,200,000us-gaap_ProductWarrantyAccrualClassifiedCurrent
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AutomobilesMember
 
Estimated warranty obligation noncurrent $ 500,000us-gaap_ProductWarrantyAccrualNoncurrent
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AutomobilesMember
  $ 700,000us-gaap_ProductWarrantyAccrualNoncurrent
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AutomobilesMember