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Fair Value Measurements - Schedule of Estimated Fair Value and Book Value of Debt Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Book value of debt instruments:
Current maturities of long-term debt and capital lease obligations	$ 19,758us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent	$ 7,345us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt and capital lease obligations	550,510us-gaap_LongTermDebtAndCapitalLeaseObligations	598,319us-gaap_LongTermDebtAndCapitalLeaseObligations
Total book value of debt instruments	570,268us-gaap_DebtAndCapitalLeaseObligations	605,664us-gaap_DebtAndCapitalLeaseObligations
Fair value of debt instruments	574,008us-gaap_FinancialInstrumentsOwnedAtFairValue	609,682us-gaap_FinancialInstrumentsOwnedAtFairValue
Excess of fair value over book value	$ 3,740sptn_DebtInstrumentsExcessDeficiencyOfFairOverBookValue	$ 4,018sptn_DebtInstrumentsExcessDeficiencyOfFairOverBookValue

X

- Definition

Debt instruments excess (deficiency) of fair over book value.

+ References

No definition available.

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X

- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13,16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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- Definition

Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: 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)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 6

-Section H

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- Definition

Amount of long-term debt and capital leases due within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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