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Income Taxes - Additional Information (Detail) $ in Thousands	9 Months Ended
	Mar. 30, 2017 USD ($)
Income Tax Disclosure [Abstract]
Excess tax benefits	$ 950
Effective tax rate	2.20%

X

- Definition

Reduction in effective tax rate due to excess tax benefits being recorded as a component of income tax expense due to adoption of ASU 2016-09.

+ References

No definition available.

+ Details

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

X

- Definition

Excess tax benefits related to share based compensation expense.

+ References

No definition available.

+ Details

Name:	jbss_ExcessTaxBenefitsRelatedToShareBasedCompensationExpense
Namespace Prefix:	jbss_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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