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Significant Accounting Policies - Shipping and Handling Cost for Last Three Fiscal Years (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 25, 2020	Jun. 27, 2019	Jun. 28, 2018
Shipping And Handling Costs [Abstract]
Shipping and handling costs	$ 21,613	$ 23,086	$ 20,418

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- Definition

Shipping and handling costs.

+ References

No definition available.

+ Details

Name:	jbss_ShippingAndHandlingCostsAbstract
Namespace Prefix:	jbss_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Shipping handling and transportation cost.

+ References

No definition available.

+ Details

Name:	jbss_ShippingHandlingAndTransportationCost
Namespace Prefix:	jbss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration