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Warranties - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Feb. 28, 2015
May 31, 2014
Warranties [Line Items]    
Warranty term, minimum 1 year  
Warranty term, maximum 3 years  
Warranty reserves $ 0.2rell_WarrantyReserves $ 0.2rell_WarrantyReserves