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Fair Value of Financial Instruments - Nonrecurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 27, 2014
Equipment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a nonrecurring basis	$ 890
Non-compete Agreement [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a nonrecurring basis	882
Customer Relationships [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets measured at fair value on a nonrecurring basis	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
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
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

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

Name:	us-gaap_AssetsFairValueDisclosureNonrecurring
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration