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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Jan. 29, 2017
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on a Recurring Basis
The following table presents information about assets measured at fair value on a recurring basis:

 
  
Fair value measurements at January 29, 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
   $ 
-
    
$
30,682
      
N/A
    
$
30,682
  
Premier Money Market Fund
    
4,888
      
N/A
      
N/A
      
4,888
  
Low Duration Bond Fund
    
1,073
      
N/A
      
N/A
      
1,073
  
Intermediate Term Bond Fund
    
739
      
N/A
      
N/A
      
739
  
Strategic Income Fund
    
598
      
N/A
      
N/A
      
598
  
Large Blend Fund
    
343
      
N/A
      
N/A
      
343
  
Growth Allocation Fund
    
113
      
N/A
      
N/A
      
113
  
Moderate Allocation Fund
    
83
      
N/A
      
N/A
      
83
  
Other
    
61
      
N/A
      
N/A
      
61
  

 
  
Fair value measurements at January 31, 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
   $ 
3,071
      
N/A
      
N/A
    
$
3,071
  
Low Duration Bond Fund
    
1,592
      
N/A
      
N/A
      
1,592
  
Intermediate Term Bond Fund
    
1,116
      
N/A
      
N/A
      
1,116
  
Strategic Income Fund
    
957
      
N/A
      
N/A
      
957
  
Limited Term Bond Fund
    
594
      
N/A
      
N/A
      
594
  
Large Blend Fund
    
254
      
N/A
      
N/A
      
254
  
Growth Allocation Fund
    
128
      
N/A
      
N/A
      
128
  
Mid Cap Value Fund
    
90
      
N/A
      
N/A
      
90
  
Other
    
47
      
N/A
      
N/A
      
47
  

 
  
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