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Merger - Intangible Assets Acquired (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jul. 12, 2014
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible Assets | $ 30,050
Trade names [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible Assets | 6,700
Useful Life | Indefinite
Customer lists [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible Assets | 5,200
Useful Life | 7 years
Customer relationships [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible Assets | 13,500
Useful Life | 20 years
Favorable leases [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Intangible Assets | $ 4,650
Favorable leases [Member] | Minimum [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Useful Life | 7 years
Favorable leases [Member] | Maximum [Member] |
Acquired Finite-Lived Intangible Assets [Line Items] |
Useful Life | 22 years

X
- Definition Finite Lived Intangible Assets Useful Life Description + References No definition available. + Details
Name: | sptn_FiniteLivedIntangibleAssetsUsefulLifeDescription
Namespace Prefix: | sptn_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration