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Related Party Transaction - Additional Information (Detail) - Promissory Note [Member] - USD ($) $ in Thousands	3 Months Ended
	Sep. 26, 2019	Dec. 28, 2017
Purchase price financed by seller through unsecured debt		$ 11,500
Executive Officer [Member]
Interest paid to related parties	$ 70

X

- Definition

Business combination, consideration transferred promissory note.

+ References

No definition available.

+ Details

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

X

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

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

X

- Details

Name:	us-gaap_DebtInstrumentAxis=jbss_PromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=srt_ExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: