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Long Term Debt - Summary of Debt Instruments (Parenthetical) (Detail)	9 Months Ended	12 Months Ended
	Dec. 28, 2013	Jan. 03, 2015
Revolving credit agreement [Member]
Debt Instrument [Line Items]
Notes maturity date	Nov. 19, 2018	Nov. 19, 2018
Senior Notes [Member]
Debt Instrument [Line Items]
Notes maturity date	Dec. 15, 2016	Dec. 15, 2016
Senior notes, rate	6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember	6.625%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Notes maturity date	Nov. 19, 2018	Nov. 19, 2018
Long-term Debt [Member]
Debt Instrument [Line Items]
Interest Rate Range, Minimum	2.61%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_FinancialInstrumentAxis = us-gaap_LongTermDebtMember	2.61%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_FinancialInstrumentAxis = us-gaap_LongTermDebtMember
Interest Rate Range, Maximum	9.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_FinancialInstrumentAxis = us-gaap_LongTermDebtMember	9.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_FinancialInstrumentAxis = us-gaap_LongTermDebtMember
Other debt, due date, start	2015	2015
Other debt, due date, end	2020	2020

X

- Definition

Debt instruments maturity date range end.

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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=6877327&loc=d3e13212-122682

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X

- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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=6877327&loc=d3e13212-122682

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- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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=6877327&loc=d3e13212-122682

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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/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-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=6877327&loc=d3e13212-122682

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- Details

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- Details

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