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Warranty - Additional Information (Detail) - USD ($)
Feb. 29, 2016
May. 31, 2015
Feb. 28, 2015
May. 31, 2014
Guarantor Obligations [Line Items]        
Estimated warranty obligation $ 7,155,000 $ 6,911,000 $ 5,722,000 $ 5,697,000
Discontinued Recreational Vehicles Segment [Member]        
Guarantor Obligations [Line Items]        
Estimated warranty obligation $ 62,000