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Garysburg, North Carolina Facility - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 24, 2020 | Dec. 24, 2020
Damage from Fire, Explosion or Other Hazard [Member] |  |
Fire Note [Line Items] |  |
Advance payment of insurance | $ 2,934 | $ 2,523

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- References No definition available. + Details
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Namespace Prefix: | jbss_
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Period Type: | duration

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- Definition Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
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