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Associate Retirement Plans - Additional Information (Detail) - USD ($)	6 Months Ended		12 Months Ended
	Jul. 16, 2016	Jul. 18, 2015	Dec. 31, 2016
SpartanNash Company Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Standard pension funding carryover	$ 0
SpartanNash Company Pension Plan [Member] | Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Standard pension funding carryover			$ 0
Central States, Southeast and Southwest Areas Pension Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension contributions during last plan year	$ 7,500,000	$ 7,400,000

X

- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ 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 (b)(3)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

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+ References

No definition available.

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- 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

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