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Fair Value of Financial Instruments - Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 26, 2014
Apr. 28, 2013
Jan. 27, 2013
Low Duration Bond Fund [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets measured at fair value on a recurring basis $ 2,069 $ 2,076 $ 2,066
Limited Term Bond Fund [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets measured at fair value on a recurring basis 2,570 2,092 2,070
Intermediate Term Bond Fund [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets measured at fair value on a recurring basis 1,612 1,118 1,101
Quoted prices in active markets for identical assets - Level 1 [Member] | Low Duration Bond Fund [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets measured at fair value on a recurring basis 2,069 2,076 2,066
Quoted prices in active markets for identical assets - Level 1 [Member] | Limited Term Bond Fund [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets measured at fair value on a recurring basis 2,570 2,092 2,070
Quoted prices in active markets for identical assets - Level 1 [Member] | Intermediate Term Bond Fund [Member]
      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Assets measured at fair value on a recurring basis $ 1,612 $ 1,118 $ 1,101