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Merger - Business Acquisitions Consideration Transferred (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015
Business Combinations [Abstract]
Spartan Stores common shares issued and deferred		16,119us-gaap_StockIssuedDuringPeriodSharesAcquisitions
Trading price		$ 23.55us-gaap_BusinessAcquisitionSharePrice
Fair value of shares issued	$ 379,600us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable	$ 379,600us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
Cash paid for fractional shares		14sptn_BusinessCombinationConsiderationTransferredCashPaidForFractionalShares
Total		$ 379,614us-gaap_BusinessCombinationConsiderationTransferred1

X

- Definition

Business combination consideration transferred cash paid for fractional shares.

+ References

No definition available.

+ Details

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X

- Definition

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

+ References

No definition available.

+ Details

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X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

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- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 30

-Section 30

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477



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- Definition

Number of shares of stock issued during the period pursuant to acquisitions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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-Name Regulation S-X (SX)

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-Section 02

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