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Earnings Per Common Share - Summary of Anti-dilutive Awards Excluded from Computation of Diluted Earnings Per Share (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Mar. 26, 2020	Mar. 28, 2019	Mar. 26, 2020	Mar. 28, 2019
Earnings Per Share [Abstract]
Weighted average number of anti-dilutive awards:	28,040	0	9,347	0
Weighted average exercise price per award:	$ 90.26	$ 0	$ 90.26	$ 0

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- Definition

Weighted average exercise price of anti dilutive options outstanding.

+ References

No definition available.

+ Details

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

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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Period Type:	duration

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- References

No definition available.

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Namespace Prefix:	us-gaap_
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