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Significant Accounting Policies - Schedule of Gross Rental Income and Rental (Expense) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 27, 2019	Jun. 28, 2018	Jun. 29, 2017
Gross Rental Income And Expense [Abstract]
Gross rental income	$ 1,978	$ 1,988	$ 2,003
Rental (expense), net	$ (1,104)	$ (1,420)	$ (1,311)

X

- Definition

Gross Rental Income and (Expense) [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Income earned by providing the use of assets to an outside party in exchange for a payment or series of payments that is nonoperating in nature.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.7)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

+ Details

Name:	us-gaap_RentalIncomeNonoperating
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration