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Significant Accounting Policies (Details 6) | Jun. 28, 2012 | Jun. 30, 2011 | Jun. 24, 2010
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Customers exceeding 10% of net sales |  |  |
Percentage of net sales | 100.00% | 100.00% | 100.00%
Wal-Mart Stores, Inc [Member] |  |  |
Customers exceeding 10% of net sales |  |  |
Percentage of net sales | 21.00% | 20.00% | 19.00%
Target Corporation [Member] |  |  |
Customers exceeding 10% of net sales |  |  |
Percentage of net sales | 15.00% | 12.00% | 12.00%

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- Details
Name: | jbss_ScheduleOfSignificantCustomersAbstract
Namespace Prefix: | jbss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of net product revenue to total net revenue from the sale of goods as of year end. + References No definition available. + Details
Name: | us-gaap_SalesRevenueGoodsNetPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant