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Subsequent Event - Additional Information (Detail) - Commercial Agreement [Member] - NV Investment Holdings [Member] - Subsequent Event [Member]	Oct. 07, 2020 $ / shares shares
Subsequent Event [Line Items]
Warrant to acquire number of securities, common stock shares	5,437,272
Exercise price | $ / shares	$ 17.7257
Right to purchase warrant, expiration date	Oct. 07, 2027
Warrants One [Member]
Subsequent Event [Line Items]
Percentage of warrants, outstanding and issuable shares	2.50%
Warrant to purchase number of securities, common stock shares vested	1,087,455
Warrants Two [Member]
Subsequent Event [Line Items]
Percentage of warrants, outstanding and issuable shares	10.00%
Warrant to purchase number of securities, common stock shares vested	4,349,817

X

- Definition

Class of warrants or right number of securities vested.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of warrants, outstanding and issuable shares.

+ References

No definition available.

+ Details

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X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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X

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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X

- Definition

Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format.

+ References

Reference 1: 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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