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Sale of Real Property - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Dec. 26, 2013
Gain (Loss) on Disposition of Property Plant Equipment [Abstract]  
Proceeds from sale of land and building $ 8,000us-gaap_ProceedsFromSaleOfLandHeldForUse
Gain on sale of land and building 1,037jbss_GainLossOnSaleOfLand
Income tax expense of sale of land and building $ 604jbss_IncomeTaxImpactOfSaleOfAssetsHeldForSale