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Employee Benefit Plans - Additional Information (Detail)	12 Months Ended
	Jun. 24, 2021
Employee Contribution First Three Percent [Member]
Defined Benefit Plan And Defined Contribution Plan Disclosure [Line Items]
Matching percentage by employer for 401(k) plan contributions	100.00%
Percent of employee contribution under contributory plan	3.00%
Employee Contribution Next Two Percent [Member]
Defined Benefit Plan And Defined Contribution Plan Disclosure [Line Items]
Matching percentage by employer for 401(k) plan contributions	50.00%
Percent of employee contribution under contributory plan	2.00%

X

- Definition

Defined Benefit Plan and Defined Contribution Plan Disclosure [Line Items]

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanNameAxis=jbss_EmployeeContributionNextTwoPercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: