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Fair Value of Financial Instruments - Nonrecurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 27, 2014
Jul. 28, 2013
Equipment [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets measured at fair value on a nonrecurring basis $ 890 $ 890
Non-compete Agreement [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets measured at fair value on a nonrecurring basis 882 882
Customer Relationships [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets measured at fair value on a nonrecurring basis 868 868
Significant other observable inputs - Level 2 [Member] | Equipment [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets measured at fair value on a nonrecurring basis 890 890
Significant unobservable inputs - Level 3 [Member] | Non-compete Agreement [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets measured at fair value on a nonrecurring basis 882 882
Significant unobservable inputs - Level 3 [Member] | Customer Relationships [Member]
   
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Assets measured at fair value on a nonrecurring basis $ 868 $ 868