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Significant Accounting Policies - Schedule of Gross Rental Income and Rental (Expense) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Jun. 27, 2019 | Jun. 28, 2018 | Jun. 29, 2017
Gross Rental Income And Expense [Abstract] |  |  |
Gross rental income | $ 1,978 | $ 1,988 | $ 2,003
Rental (expense), net | $ (1,104) | $ (1,420) | $ (1,311)

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- Definition Gross Rental Income and (Expense) [Abstract] + References No definition available. + Details
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Namespace Prefix: | jbss_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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