Class of warrants or right non-vested warrants expensed as vesting conditions are satisfied over the remaining term.

No definition available.

Name:	sptn_ClassOfWarrantsOrRightNonVestedWarrantsExpensedAsVestingConditionsAreSatisfiedOverRemainingTerm
Namespace Prefix:	sptn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Class of warrants or right nonvested warrants intrinsic value.

+ References

No definition available.

+ Details

Name:	sptn_ClassOfWarrantsOrRightNonvestedWarrantsIntrinsicValue
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Class of warrants or right number of securities vested.

+ References

No definition available.

+ Details

Name:	sptn_ClassOfWarrantsOrRightNumberOfSecuritiesVested
Namespace Prefix:	sptn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Class of warrants or right number of securities vested and exercisable.

+ References

No definition available.

+ Details

Name:	sptn_ClassOfWarrantsOrRightNumberOfSecuritiesVestedAndExercisable
Namespace Prefix:	sptn_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Class of warrants or right unrecognized cost related to non-vested warrants.

+ References

No definition available.

+ Details

Name:	sptn_ClassOfWarrantsOrRightUnrecognizedCostRelatedToNonVestedWarrants
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Class of warrants or right vested warrants intrinsic value.

+ References

No definition available.

+ Details

Name:	sptn_ClassOfWarrantsOrRightVestedWarrantsIntrinsicValue
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage of warrants, outstanding and issuable shares.

+ References

No definition available.

+ Details

Name:	sptn_PercentageOfWarrantsOutstandingAndIssuableShares
Namespace Prefix:	sptn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Warrants Commercial supply agreement.

+ References

No definition available.

+ Details

Name:	sptn_WarrantsCommercialSupplyAgreement
Namespace Prefix:	sptn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Warrants grant date fair value per share.

+ References

No definition available.

+ Details

Name:	sptn_WarrantsGrantDateFairValuePerShare
Namespace Prefix:	sptn_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- 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 https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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 YYYY-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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_CounterpartyNameAxis=sptn_NVInvestmentHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=sptn_CommercialAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=sptn_WarrantsOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=sptn_WarrantsTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_RestrictedStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_PerformanceSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		4 Months Ended	9 Months Ended
	Oct. 07, 2020	Apr. 22, 2023	Oct. 08, 2022	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock warrant, outstanding and nonvested		3,371,103		3,479,849
Unrecognized cost related to non-vested warrant shares		$ 17.9
Non-vested warrant shares expensed as vesting conditions are satisfied over the remaining term		4 years 6 months
Warrant shares, vested and exercisable		2,066,169
Non-vested warrant shares, intrinsic value		$ 23.6
Vested warrant shares, intrinsic value		14.5
NV Investment Holdings [Member] \| Commercial Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrant to acquire number of securities, common stock shares	5,437,272
Exercise price	$ 17.7257
Warrant commercial supply agreement	$ 200.0
Right to purchase warrant, expiration date	Oct. 07, 2027
NV Investment Holdings [Member] \| Commercial Agreement [Member] \| Warrants One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of warrant, outstanding and issuable shares	2.50%
Warrant to purchase number of securities, common stock shares vested	1,087,455
Warrant grant date fair value per share	$ 5.51
NV Investment Holdings [Member] \| Commercial Agreement [Member] \| Warrants Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of warrant, outstanding and issuable shares	10.00%
Warrant grant date fair value per share	$ 5.33
Stock warrant, outstanding and nonvested	4,349,817
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		15.0
Unrecognized compensation cost, weighted average period of recognition			2 years 2 months 12 days
Performance Share Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost		$ 7.5
Unrecognized compensation cost, weighted average period of recognition		2 years 8 months 12 days