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Fair Value of Financial Instruments (Tables)
 3 Months Ended
Jul. 30, 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 July 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
  
$
-
    
$
30,846
    
$
-
    
$
30,846
  
Premier Money Market Fund
    
5,991
      
N/A
      
N/A
      
5,991
  
Low Duration Bond Fund
    
1,085
      
N/A
      
N/A
      
1,085
  
Intermediate Term Bond Fund
    
762
      
N/A
      
N/A
      
762
  
Strategic Income Fund
    
622
      
N/A
      
N/A
      
622
  
Large Blend Fund
    
381
      
N/A
      
N/A
      
381
  
Growth Allocation Fund
    
140
      
N/A
      
N/A
      
140
  
Moderate Allocation Fund
    
102
      
N/A
      
N/A
      
102
  
Other
    
100
      
N/A
      
N/A
      
100
  
 
 
  
Fair value measurements at July 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
  
$
3,950
      
N/A
      
N/A
    
$
3,950
  
Low Duration Bond Fund
    
1,073
      
N/A
      
N/A
      
1,073
  
Intermediate Term Bond Fund
    
754
      
N/A
      
N/A
      
754
  
Strategic Income Fund
    
597
      
N/A
      
N/A
      
597
  
Large Blend Fund
    
310
      
N/A
      
N/A
      
310
  
Mid Cap Value Fund
    
117
      
N/A
      
N/A
      
117
  
Growth Allocation Fund
    
97
      
N/A
      
N/A
      
97
  
Other
    
147
      
N/A
      
N/A
      
147
  
 
 
  
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