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Employee Benefit Plans - Expense for 401(k) Plan (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 30, 2016 | Jun. 25, 2015 | Jun. 26, 2014
401(k) [Member] |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
401(k) plan expense | $ 1,604 | $ 1,550 | $ 1,356

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PlanNameAxis=jbss_K401PlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |