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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2016 | Jun. 25, 2015 | Sep. 25, 2008
Defined Benefit Plan And Defined Contribution Plan Disclosure [Line Items] |  |  |
Long-term liability recorded for withdrawal from multi-employer plan | $ 466 | $ 530 | $ 868
Monthly payment including interest based on terms of settlement with labor union | $ 8 |  |
Employee Contribution First Three Percent [Member] |  |  |
Defined Benefit Plan And Defined Contribution Plan Disclosure [Line Items] |  |  |
Matching percentage by employer for 401(k) plan contributions | 100.00% |  |
Percent of employee contribution under contributory plan | 3.00% |  |
Employee Contribution Next Two Percent [Member] |  |  |
Defined Benefit Plan And Defined Contribution Plan Disclosure [Line Items] |  |  |
Matching percentage by employer for 401(k) plan contributions | 50.00% |  |
Percent of employee contribution under contributory plan | 2.00% |  |

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- Definition Defined Benefit Plan and Defined Contribution Plan Disclosure [Line Items] + References No definition available. + Details
Name: | jbss_DefinedBenefitPlanAndDefinedContributionPlanDisclosureLineItems
Namespace Prefix: | jbss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Payment To Laborers + References No definition available. + Details
Name: | jbss_PaymentToLaborers
Namespace Prefix: | jbss_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Route Pension Liability + References No definition available. + Details
Name: | jbss_RoutePensionLiability
Namespace Prefix: | jbss_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DefinedContributionPlanTypeAxis=jbss_EmployeeContributionNextTwoPercentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |