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Fair Value Measurements - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jul. 12, 2014	Jul. 20, 2013
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
Long-lived assets	$ 0.9	$ 3.6
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	$ 1.4

X

- Details

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

X

- 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

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