Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Mar. 26, 2015	Mar. 27, 2014	Mar. 26, 2015	Mar. 27, 2014
Statement of Comprehensive Income [Abstract]
Net sales	$ 209,396us-gaap_SalesRevenueGoodsNet	$ 174,291us-gaap_SalesRevenueGoodsNet	$ 665,806us-gaap_SalesRevenueGoodsNet	$ 576,102us-gaap_SalesRevenueGoodsNet
Cost of sales	179,612us-gaap_CostOfGoodsSold	151,492us-gaap_CostOfGoodsSold	568,095us-gaap_CostOfGoodsSold	486,986us-gaap_CostOfGoodsSold
Gross profit	29,784us-gaap_GrossProfit	22,799us-gaap_GrossProfit	97,711us-gaap_GrossProfit	89,116us-gaap_GrossProfit
Operating expenses:
Selling expenses	11,155us-gaap_SellingExpense	10,283us-gaap_SellingExpense	37,898us-gaap_SellingExpense	35,338us-gaap_SellingExpense
Administrative expenses	7,132us-gaap_GeneralAndAdministrativeExpense	6,378us-gaap_GeneralAndAdministrativeExpense	21,625us-gaap_GeneralAndAdministrativeExpense	20,559us-gaap_GeneralAndAdministrativeExpense
Gain on sale of assets held for sale, net	0us-gaap_GainLossOnDispositionOfAssets1	0us-gaap_GainLossOnDispositionOfAssets1	0us-gaap_GainLossOnDispositionOfAssets1	(1,641)us-gaap_GainLossOnDispositionOfAssets1
Total operating expenses	18,287us-gaap_OperatingExpenses	16,661us-gaap_OperatingExpenses	59,523us-gaap_OperatingExpenses	54,256us-gaap_OperatingExpenses
Income from operations	11,497us-gaap_OperatingIncomeLoss	6,138us-gaap_OperatingIncomeLoss	38,188us-gaap_OperatingIncomeLoss	34,860us-gaap_OperatingIncomeLoss
Other expense:
Interest expense including $277, $284, $835 and $855 to related parties	1,028us-gaap_InterestExpense	1,077us-gaap_InterestExpense	2,895us-gaap_InterestExpense	3,225us-gaap_InterestExpense
Rental and miscellaneous expense, net	372jbss_RentalAndMiscellaneousExpenseNet	453jbss_RentalAndMiscellaneousExpenseNet	2,830jbss_RentalAndMiscellaneousExpenseNet	1,777jbss_RentalAndMiscellaneousExpenseNet
Total other expense, net	1,400us-gaap_NonoperatingIncomeExpense	1,530us-gaap_NonoperatingIncomeExpense	5,725us-gaap_NonoperatingIncomeExpense	5,002us-gaap_NonoperatingIncomeExpense
Income before income taxes	10,097	4,608	32,463	29,858
Income tax expense	3,579us-gaap_IncomeTaxExpenseBenefit	927us-gaap_IncomeTaxExpenseBenefit	11,627us-gaap_IncomeTaxExpenseBenefit	10,178us-gaap_IncomeTaxExpenseBenefit
Net income	6,518us-gaap_NetIncomeLoss	3,681us-gaap_NetIncomeLoss	20,836us-gaap_NetIncomeLoss	19,680us-gaap_NetIncomeLoss
Other comprehensive income:
Amortization of prior service cost and actuarial gain included in net periodic pension cost	239	222	718	667
Income tax expense related to pension adjustments	(95)	(89)	(287)	(267)
Other comprehensive income, net of tax:	144	133	431	400
Comprehensive income	$ 6,662us-gaap_ComprehensiveIncomeNetOfTax	$ 3,814us-gaap_ComprehensiveIncomeNetOfTax	$ 21,267us-gaap_ComprehensiveIncomeNetOfTax	$ 20,080us-gaap_ComprehensiveIncomeNetOfTax
Net income per common share-basic	$ 0.58us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 1.87us-gaap_EarningsPerShareBasic	$ 1.79us-gaap_EarningsPerShareBasic
Net income per common share-diluted	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 1.86us-gaap_EarningsPerShareDiluted	$ 1.77us-gaap_EarningsPerShareDiluted
Cash dividends declared per share	$ 0.00	$ 0.00	$ 1.50	$ 1.50

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