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Warranty - Additional Information (Detail) - USD ($)
May. 31, 2015
May. 31, 2014
May. 31, 2013
Guarantor Obligations [Line Items]      
Estimated warranty obligation $ 6,911,000 $ 5,697,000 $ 5,882,000
Estimated warranty obligation current 4,511,000 3,697,000  
Estimated warranty obligation noncurrent 2,400,000 2,000,000  
Discontinued Operations [Member]      
Guarantor Obligations [Line Items]      
Estimated warranty obligation $ 642,000    
Recreational Vehicles [Member]      
Guarantor Obligations [Line Items]      
Estimated warranty obligation   1,900,000  
Estimated warranty obligation current   1,200,000  
Estimated warranty obligation noncurrent   $ 700,000