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Supplementary Quarterly Data (Unaudited) - Unaudited Quarterly Consolidated Financial Data (parenthetical) (Detail)	Jun. 25, 2020
Quarterly Financial Information Disclosure [Abstract]
Percent of decrease in weighted average selling price per pound	3.30%

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- Definition

Percent of decrease in weighted average selling price per pound.

+ References

No definition available.

+ Details

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Namespace Prefix:	jbss_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration