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Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
May 31, 2014
Home
May 31, 2013
Home
May 31, 2014
Minimum [Member]
May 31, 2014
Maximum [Member]
Loss Contingencies [Line Items]        
Period to potentially repurchase units     12 months 24 months
Maximum potential repurchase liability $ 63,000,000 $ 71,000,000    
Other accrued liabilities 100,000 100,000    
Certificate of deposit pledged   $ 600,000    
Number of homes to be manufactured and sold 60 60