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Employee Benefit Plans - Total Route Pension Liability (Detail) - USD ($) $ in Thousands	Jun. 27, 2019	Jun. 28, 2018	Sep. 05, 2008
Route Pension Liability [Abstract]
Route pension liability	$ 251	$ 323	$ 868

X

- Definition

Route Pension Liability

+ References

No definition available.

+ Details

Name:	jbss_RoutePensionLiability
Namespace Prefix:	jbss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Route pension liability.

+ References

No definition available.

+ Details

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