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Fair Value of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 27, 2013 | Apr. 29, 2012
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Low Duration Bond Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets measured at fair value on a recurring basis | $ 2,066 | $ 2,049
Limited Term Bond Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets measured at fair value on a recurring basis | 2,070 | 2,037
Intermediate Term Bond Fund [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Assets measured at fair value on a recurring basis | 1,101 | 1,058
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 | 2,066 | 2,049
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 | 2,070 | 2,037
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 | $ 1,101 | $ 1,058

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring 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_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueBalanceSheetGroupingFinancialStatementCaptionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration