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Goodwill - Summary of Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Jul. 15, 2017 USD ($)
Goodwill [Line Items]
Balance at December 31, 2016	$ 322,686
Acquisitions (Note 3)	45,181
Disposals	(1,231)
Balance at July 15, 2017	366,636
Food Distribution [Member]
Goodwill [Line Items]
Balance at December 31, 2016	132,367
Acquisitions (Note 3)	45,181
Balance at July 15, 2017	177,548
Retail [Member]
Goodwill [Line Items]
Balance at December 31, 2016	190,319
Disposals	(1,231)
Balance at July 15, 2017	$ 189,088

X

- Definition

Goodwill disposed during period.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

+ Details

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X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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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

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- Details

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Namespace Prefix:
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X

- Details

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