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Significant Accounting Policies - Shipping and Handling Cost for Last Three Fiscal Years (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 26, 2025	Jun. 27, 2024	Jun. 29, 2023
Shipping And Handling Costs [Abstract]
Shipping and handling costs	$ 33,800	$ 32,460	$ 30,918

X

- 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

X

- 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