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Significant Accounting Policies - Schedule of Gross Rental Income and Rental (Expense) (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 27, 2019	Jun. 28, 2018	Jun. 29, 2017
Gross Rental Income And Expense [Abstract]
Annual depreciation expense	$ 800	$ 800	$ 800

X

- Definition

Gross Rental Income and (Expense) [Abstract]

+ References

No definition available.

+ Details

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

X

- Definition

The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

+ Details

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Balance Type:	debit
Period Type:	duration