XML 95 R76.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Associate Retirement Plans - Additional Information (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) Trust | Jan. 02, 2016 USD ($) | Jan. 03, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plans expense | $ 11,900,000 | $ 21,100,000 | $ 13,600,000
Number of Trusts | Trust | 2 |  |
Percentage of trust funded with pre-merger liability to plan participants | 125.00% |  |
Proceeds from company owned life insurance |  | 5,004,000 |
Cash surrender value of plan assets included in other long term assets | $ 154,444,000 | 127,076,000 |
Aggregate amount of life insurance coverage | 15,000,000 |  |
Distribution charges | 2,800,000 |  |
Settlement accounting charge | $ 700,000 |  |
Defined contribution plan employees minimum period of service | 10 years |  |
Defined contribution plan employees age to eligible under the plan | 55 years |  |
Maximum age of major medical insurance with deductible and coinsurance provisions | 65 years |  |
Multiplier effect of Monthly postretirement health care benefits to covered employees | $ 5 |  |
Actuarial gains and losses are amortized when accumulation of such gains and losses exceeds | 10.00% |  |
Percentage point increase or decrease in assumed health care cost trend rate | 1.00% |  |
Red zone fund status | Less than 65 percent |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
1% increase or decrease in assumed health care cost trend rate in accumulated postretirement benefit obligation | $ 100,000 |  |
Status or red zone plans | 65.00% |  |
Cash Balance Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Distribution charges |  |  | 10,600,000
Settlement accounting charge |  |  | 1,600,000
Average long-term expected return on pension plan assets | 4.83% |  |
Expected Company contribution in fiscal year ending December 30, 2017 | $ 0 |  |
Super Foods Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Distribution charges |  |  | 10,600,000
Settlement accounting charge |  |  | 1,600,000
SpartanNash Medical Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected Company contribution in fiscal year ending December 30, 2017 | 400,000 |  |
Michigan Conference of Teamsters and Ohio Conference of Teamsters Health and Welfare Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension contributions during last plan year | 14,300,000 | 15,100,000 | 14,300,000
Central States, Southeast and Southwest Areas Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension contributions during last plan year | 13,400,000 | 12,900,000 | $ 12,900,000
Cash Surrender Value [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Cash surrender value of plan assets included in other long term assets | $ 4,200,000 | $ 4,200,000 |

X
- Definition Actuarial gains and losses are amortized when accumulation of such gains and losses exceeds. + References No definition available. + Details
Name: | sptn_ActuarialGainsAndLossesAreAmortizedWhenAccumulationOfSuchGainsAndLossesExceeds
Namespace Prefix: | sptn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan assumptions used calculating benefit obligation expected long term return on plan assets. + References No definition available. + Details
Name: | sptn_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationExpectedLongTermReturnOnPlanAssets
Namespace Prefix: | sptn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined benefit plan distributions charge. + References No definition available. + Details
Name: | sptn_DefinedBenefitPlanSettlementAccountingCharge
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Defined contribution plan employees age to eligible under plan. + References No definition available. + Details
Name: | sptn_DefinedContributionPlanEmployeesAgeToEligibleUnderPlan
Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined contribution plan employees minimum period of service. + References No definition available. + Details
Name: | sptn_DefinedContributionPlanEmployeesMinimumPeriodOfService
Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Insurance coverage amount. + References No definition available. + Details
Name: | sptn_InsuranceCoverageAmount
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum age of major medical insurance with deductible and coinsurance provisions. + References No definition available. + Details
Name: | sptn_MaximumAgeOfMajorMedicalInsuranceWithDeductibleAndCoinsuranceProvisions
Namespace Prefix: | sptn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Multiplier of monthly postretirement health care benefits to covered employees. + References No definition available. + Details
Name: | sptn_MultiplierOfMonthlyPostretirementHealthCareBenefitsToCoveredEmployees
Namespace Prefix: | sptn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of trust in which entity is primary beneficiary. + References No definition available. + Details
Name: | sptn_NumberOfTrustInWhichEntityIsPrimaryBeneficiary
Namespace Prefix: | sptn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage of trust funded with pre merger liability to plan participants. + References No definition available. + Details
Name: | sptn_PercentageOfTrustFundedWithPreMergerLiabilityToPlanParticipants
Namespace Prefix: | sptn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage point increase or decrease in assumed health care cost trend rate. + References No definition available. + Details
Name: | sptn_PercentagePointIncreaseOrDecreaseInAssumedHealthCareCostTrendRate
Namespace Prefix: | sptn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Status or red zone plans. + References No definition available. + Details
Name: | sptn_StatusOrRedZonePlans
Namespace Prefix: | sptn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of decrease that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(10) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanSettlementsBenefitObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Indicate whether the multiemployer plan is less than 65 percent funded, between 65 and less than 80 percent funded, or at least 80 percent funded. The acceptable values are: (1) "less than 65 percent", (2) "between 65 and less than 80 percent", (3) "at least 80 percent", and (4) "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450657-114947 + Details
Name: | us-gaap_MultiemployerPlansFundedStatus
Namespace Prefix: | us-gaap_
Data Type: | us-types:fundedStatusItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contributions made to the multiemployer plan by all employers who participate in the plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 7 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450678-114947 + Details
Name: | us-gaap_MultiemployerPlansPlanContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherAssetsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
Name: | us-gaap_ProceedsFromLifeInsurancePolicies
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=sptn_CashBalancePensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=sptn_SuperFoodsPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=sptn_SpartanNashMedicalPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=sptn_MichiganConferenceOfTeamstersAndOhioConferenceOfTeamstersHealthAndWelfarePlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=sptn_CentralStatesSoutheastAndSouthwestAreasPensionFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=us-gaap_CashSurrenderValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |