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Fair Value of Financial Instruments - Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Aug. 03, 2014
Apr. 27, 2014
Jul. 28, 2013
Limited Term Bond Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis $ 2,578 $ 2,576 $ 2,545
Low Duration Bond Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 2,078 2,077 2,050
Intermediate Term Bond Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 1,655 1,641 1,579
Premier Money Market Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 1,712 755  
Other [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 37 10  
Quoted prices in active markets for identical assets - Level 1 [Member] | Limited Term Bond Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 2,578 2,576 2,545
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 2,078 2,077 2,050
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 1,655 1,641 1,579
Quoted prices in active markets for identical assets - Level 1 [Member] | Premier Money Market Fund [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 1,712 755  
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]
     
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis $ 37 $ 10