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Fair Value of Financial Instruments (Tables)
 12 Months Ended
Apr. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on a Recurring Basis
The following table presents information about assets and liabilities measured at fair value on a recurring basis:
 
Fair value measurements at April 30, 2017 using:  
                         
    Quoted prices in active markets
for identical
assets		     Significant other observable inputs     Significant unobservable inputs        
(amounts in thousands)    Level 1     Level 2     Level 3     Total  
Assets:                         
U.S. Corporate Bonds
  
$
-
    
$
30,831
    
$
-
    
$
30,831
  
Premier Money Market Fund
    
4,811
      
N/A
      
N/A
      
4,811
  
Low Duration Bond Fund
    
1,081
      
N/A
      
N/A
      
1,081
  
Intermediate Term Bond Fund
    
751
      
N/A
      
N/A
      
751
  
Strategic Income Fund
    
611
      
N/A
      
N/A
      
611
  
Large Blend Fund
    
365
      
N/A
      
N/A
      
365
  
Growth Allocation Fund
    
126
      
N/A
      
N/A
      
126
  
Moderate Allocation Fund
    
88
      
N/A
      
N/A
      
88
  
Other
    
76
      
N/A
      
N/A
      
76
  

 
Fair value measurements at May 1, 2016 using:  
                         
    Quoted prices in active markets
for identical
assets		     Significant other observable inputs     Significant unobservable inputs        
(amounts in thousands)    Level 1     Level 2     Level 3     Total  
Assets:                         
Premier Money Market Fund
  
$
3,404
      
N/A
      
N/A
    
$
3,404
  
Low Duration Bond Fund
    
1,604
      
N/A
      
N/A
      
1,604
  
Intermediate Term Bond Fund
    
1,154
      
N/A
      
N/A
      
1,154
  
Strategic Income Fund
    
999
      
N/A
      
N/A
      
999
  
Limited Term Bond Fund
    
602
      
N/A
      
N/A
      
602
  
Large Blend Fund
    
289
      
N/A
      
N/A
      
289
  
Growth Allocation Fund
    
148
      
N/A
      
N/A
      
148
  
Mid Cap Value Fund
    
102
      
N/A
      
N/A
      
102
  
Other
    
82
      
N/A
      
N/A
      
82