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Reporting Segment Information - Additional Information (Detail)	12 Months Ended
	Dec. 29, 2018 Segment Distribution_Centers Supermarkets PharmacyServices Fuel_Center
Segment Reporting Information [Line Items]
Number of Reportable Segment | Segment	3
Number of distribution centers	14
Number of military distribution centers	7
Number of corporate-owned retail stores | Supermarkets	139
Number of retail stores offered pharmacy services | PharmacyServices	83
Number of fuel centers operated | Fuel_Center	29
Food Distribution [Member]
Segment Reporting Information [Line Items]
Number of military distribution centers	2

X

- Definition

Number of corporate-owned retail stores.

+ References

No definition available.

+ Details

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X

- Definition

Number of food distribution centers.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
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Balance Type:	na
Period Type:	instant

X

- Definition

Number of fuel centers operated.

+ References

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+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- Definition

Number of military distribution centers.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Number of retail stores offered pharmacy services.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

+ Details

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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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