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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | Apr. 19, 2014 | Apr. 27, 2013
--- | --- | ---
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Long-lived assets | $ 0.9 | $ 2.4
Significant unobservable inputs (Level 3) [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Long-lived assets measured fair value on nonrecurring basis | $ 0 | $ 1.2

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- Details
Name: | sptn_FairValueOfAssetsAndLiabilitiesMeasuredOnNonRecurringBasisLineItems
Namespace Prefix: | sptn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long Lived Assets Fair Value + References No definition available. + Details
Name: | sptn_LongLivedAssetsFairValue
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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 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