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RETIREMENT PLANS (Details) (USD $)
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2012
RETIREMENT PLANS [Abstract]      
Age threshold for 401 (k) plan P21Y    
Requisite service period to participate in contribution plan (in months) 6 months    
Hours worked per calendar year established as threshold for 401(k) plan (in hours) 1000 hours    
Maximum contribution each employee towards profit sharing plan (in hundredths) 3.50%    
Maximum contribution each employee, towards 401(k) plan (in hundredths) 4.00%    
Total contribution percentage in profit sharing and 401(k) plan (in hundredths) 7.50%    
Employer contribution towards profit sharing plan and 401(k) plan $ 1,100,000 $ 912,000 $ 871,000