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Long-Term Debt - Summary of Debt Instruments (Parenthetical) (Detail)	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Long-term Debt [Member]
Debt Instrument [Line Items]
Other debt, due date, start	2021	2021
Other debt, due date, end	2026	2026
Long-term Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest Rate Range	2.61%	2.61%
Long-term Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest Rate Range	4.36%	4.36%
Senior Secured Revolving Credit Facility | Revolving credit agreement [Member]
Debt Instrument [Line Items]
Notes maturity date	Dec. 18, 2023	Dec. 18, 2023

X

- Definition

Debt instruments maturity date range end.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Definition

Debt instruments maturity date range start.

+ References

No definition available.

+ Details

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Namespace Prefix:	sptn_
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X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- 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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X

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Details

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- Details

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- Details

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- Details

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- Details

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