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Fair Value of Financial Instruments (Tables)
 9 Months Ended
Jan. 31, 2016
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities 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 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 February 1, 2015 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:
                        
Limited Term Bond Fund
   $ 3,112       N/A       N/A     $ 3,112  
Intermediate Term Bond Fund
     2,188       N/A       N/A       2,188  
Low Duration Bond Fund
     2,084       N/A       N/A       2,084  
Premier Money Market Fund
     1,951       N/A       N/A       1,951  
Strategic Income Fund
     1,000       N/A       N/A       1,000  
Growth Allocation Fund
     63       N/A       N/A       63  
Other
     49       N/A       N/A       49  

   
Fair value measurements at May 3, 2015 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:
                        
Limited Term Bond Fund
   $ 3,107       N/A       N/A     $ 3,107  
Premier Money Market Fund
     2,285       N/A       N/A       2,285  
Intermediate Term Bond Fund
     2,181       N/A       N/A       2,181  
Low Duration Bond Fund
     2,096       N/A       N/A       2,096  
Strategic Income Fund
     1,008       N/A       N/A       1,008  
Growth Allocation Fund
     85       N/A       N/A       85  
Other
     45       N/A       N/A       45