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Significant Accounting Policies - Schedule of Gross Rental Income and Rental (Expense) (Parenthetical) (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] |  |  |
Annual depreciation expense | $ 800 | $ 800 | $ 800

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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 The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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