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Employee Benefit Plans - Total Route Pension Liability (Detail) - USD ($) $ in Thousands | Jun. 25, 2020 | Jun. 27, 2019 | Sep. 05, 2008
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Route Pension Liability [Abstract] |  |  |
Route pension liability | $ 168 | $ 251 | $ 868

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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 Route pension liability. + References No definition available. + Details
Name: | jbss_RoutePensionLiabilityAbstract
Namespace Prefix: | jbss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration