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Discontinued Operations - Additional Information (Detail)
12 Months Ended
Oct. 07, 2014
USD ($)
a
ft²
May. 31, 2015
USD ($)
Facility
May. 31, 2014
USD ($)
Vehicle
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on the sale of idle facilities   $ 243,000 $ 706,000
Number of idle recreational vehicle manufacturing facilities for sale | Vehicle     2
Evergreen Recreational Vehicles LLC [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Percent of Corporation's cost for raw materials inventory purchased 50.00%    
Corporation's raw material cost $ 1,600,000    
Reduction in value of the raw material and payment (910,000)    
Amount received for the inventory used by Evergreen   $ 681,000  
Recreational Vehicle Operations [Member] | Bristol [Member] | Manufacturing Facility [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash payment received as consideration for asset sold 806,000    
Prorated property taxes 73,000    
Selling expenses 2,000    
Bristol, Indiana Manufacturing Facility [Member] | Recreational Vehicle Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash payment received as consideration for asset sold $ 175,000    
Bristol, Indiana Manufacturing Facility [Member] | Recreational Vehicle Operations [Member] | Bristol [Member] | Manufacturing Facility [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Area of property | ft² 135,000    
Area of land | a 18.2    
Elkhart Indiana [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number of idle recreational vehicle manufacturing facilities for sale | Facility   2  
Elkhart Indiana [Member] | Recreational Vehicles [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Gain on the sale of idle facilities   $ 670,000