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Associate Retirement Plans - Estimated Benefit Payments Expected to be Paid (Detail) (USD $)
In Thousands, unless otherwise specified
Jan. 03, 2015
Pension Benefits and SERP Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2015 $ 8,498us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PensionBenefitsAndSerpBenefitsMember
2016 8,271us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PensionBenefitsAndSerpBenefitsMember
2017 8,177us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PensionBenefitsAndSerpBenefitsMember
2018 7,639us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PensionBenefitsAndSerpBenefitsMember
2019 7,375us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PensionBenefitsAndSerpBenefitsMember
2020 to 2024 32,146us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PensionBenefitsAndSerpBenefitsMember
Postretirement Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
2015 383us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PostretirementBenefitsMember
2016 406us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PostretirementBenefitsMember
2017 443us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PostretirementBenefitsMember
2018 485us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PostretirementBenefitsMember
2019 523us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PostretirementBenefitsMember
2020 to 2024 $ 3,127us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= sptn_PostretirementBenefitsMember