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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
Apr. 25, 2015
Jan. 03, 2015
Book value of debt instruments:    
Current maturities of long-term debt and capital lease obligations $ 19,019us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent $ 19,758us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Long-term debt and capital lease obligations 516,237us-gaap_LongTermDebtAndCapitalLeaseObligations 550,510us-gaap_LongTermDebtAndCapitalLeaseObligations
Total book value of debt instruments 535,256us-gaap_DebtAndCapitalLeaseObligations 570,268us-gaap_DebtAndCapitalLeaseObligations
Fair value of debt instruments 540,421us-gaap_FinancialInstrumentsOwnedAtFairValue 574,008us-gaap_FinancialInstrumentsOwnedAtFairValue
Excess of fair value over book value $ 5,165sptn_DebtInstrumentsExcessDeficiencyOfFairOverBookValue $ 3,740sptn_DebtInstrumentsExcessDeficiencyOfFairOverBookValue