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Income Taxes - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 25, 2014
Operating Loss Carryforwards [Line Items]  
Increase in unrecognized tax benefits $ 145us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Increase in Accrued interest and penalties 19jbss_IncreaseInUnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized tax benefits and accrued interest and penalties long-term 427us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
United States [Member] | Earliest Tax Year [Member]  
Operating Loss Carryforwards [Line Items]  
Year of tax return audit 2011
Illinois [Member] | Earliest Tax Year [Member]  
Operating Loss Carryforwards [Line Items]  
Year of tax return audit 2013
California [Member] | Earliest Tax Year [Member]  
Operating Loss Carryforwards [Line Items]  
Year of tax return audit 2009
State and Local Jurisdiction [Member]  
Operating Loss Carryforwards [Line Items]  
Gross state tax credits $ 3,649us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
Gross state tax net operating losses expiration dates 2024