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Commitments and Contingencies (Details) (USD $)
9 Months Ended
Feb. 28, 2013
Homes
Feb. 29, 2012
Nov. 30, 2012
Homes
May 31, 2012
Commitments and Contingencies (Additional Textual) [Abstract]        
Maximum potential repurchase liability $ 74,000,000     $ 64,000,000
Obligations from repurchased units 0 0    
Net losses from repurchased units 0 0    
Number of homes to be manufactured and sold 60   60  
Minimum [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Period to potentially repurchase units 12 months      
Maximum [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Period to potentially repurchase units 24 months      
Certificate of deposit [Member]
       
Commitments and Contingencies (Textual) [Abstract]        
Certificate of deposit pledged $ 600,000   600,000