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Fair Value of Financial Instruments - Recurring Basis (Detail) - USD ($)
$ in Thousands
Aug. 02, 2015
May. 03, 2015
Aug. 03, 2014
Limited Term Bond Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis $ 1,092 $ 3,107 $ 2,578
Premier Money Market Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 2,705 2,285 1,712
Intermediate Term Bond Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 2,149 2,181 1,655
Low Duration Bond Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 2,100 2,096 2,078
Strategic Income Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 995 1,008  
Growth Allocation Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 109 85  
Other [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 79 45 37
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 1,092 3,107 2,578
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 2,705 2,285 1,712
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 2,149 2,181 1,655
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 2,100 2,096 2,078
Quoted prices in active markets for identical assets - Level 1 [Member] | Strategic Income Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 995 1,008  
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Fund [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Assets measured at fair value on a recurring basis 109 85  
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 $ 79 $ 45 $ 37