Summary of Significant Accounting Policies and Basis of Presentation (Policies)	9 Months Ended
	Oct. 04, 2014
Accounting Policies [Abstract]
Fiscal Year	In connection with the merger with Nash-Finch, effective November 19, 2013, the Board of Directors of SpartanNash determined to change the Company’s fiscal year end from the last Saturday in March to the Saturday nearest to December 31, beginning with the transition period ended December 28, 2013. Beginning with fiscal 2014 the Company’s interim quarters consist of 12 weeks, except for the first quarter which consists of 16 weeks. As a result of this change, in these financial statements, including the notes thereto, financial results for the current third quarter and year-to-date ended October 4, 2014 are for 12 and 40 weeks, respectively. In addition, our Condensed Consolidated Statements of Earnings include an unaudited 12-week period and 40-week period ended October 12, 2013 and the Condensed Consolidated Statements of Cash Flows for the prior year include an unaudited 40-week period ended October 12, 2013. The prior year financial statements were recast to the new fiscal year format based upon the original fiscal period end dates. As a result, the period end date for the prior year financial statements differs with the current year by one week and the full prior fiscal year will consist of 51 weeks with the fourth quarter comprised of only 11 weeks. Fiscal year 2014 will consist of 53 weeks with the fourth quarter comprised of 13 weeks.
Recently Issued Accounting Standards	On April 10, 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08 “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” ASU No. 2014-08 changes the criteria for reporting discontinued operations and modifies related disclosure requirements. The new guidance is effective on a prospective basis for fiscal years beginning after December 15, 2014, and interim periods within those years. The Company is currently assessing the potential impact of ASU No. 2014-08 on its financial statements. On May 28, 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers,” which provides guidance for revenue recognition. The new guidance contained in the ASU affects any reporting organization that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are within the scope of other standards. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. This guidance will be effective for the Company in the first quarter of its fiscal year ending December 30, 2017. Adoption is allowed by either the full retrospective or modified retrospective approach. The Company is currently in the process of evaluating the impact of adoption of this ASU on the Company’s financial statements.
Business Combinations	The merger was accounted for under the provisions of FASB Accounting Standards Codification Topic 805, “Business Combinations.” The related assets acquired and liabilities assumed were recorded at estimated fair values on the acquisition date.

Disclosure of accounting policy for completed business combinations (purchase method, acquisition method or combination of entities under common control). This accounting policy may include a general discussion of the purchase method or acquisition method of accounting (including for example, the treatment accorded contingent consideration, the identification of assets and liabilities, the purchase price allocation process, how the fair values of acquired assets and liabilities are determined) and the entity's specific application thereof. An entity that acquires another entity in a leveraged buyout transaction generally discloses the accounting policy followed by the acquiring entity in determining the basis used to value its interest in the acquired entity, and the rationale for that accounting policy.

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- Definition

Disclosure of accounting policy for determining an entity's fiscal year or other fiscal period. This disclosure may include identification of the fiscal period end-date, the length of the fiscal period, any reporting period lag between the entity and its subsidiaries, or equity investees. If a reporting lag exists, the closing date of the entity having a different period end is generally noted, along with an explanation of the necessity for using different closing dates. Any intervening events that materially affect the entity's financial position or results of operations are generally also disclosed.

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