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Garysburg, North Carolina Facility - Additional Information (Detail) $ in Thousands	3 Months Ended
	Dec. 26, 2019 USD ($)
Fire Note [Line Items]
Clean-up cost and damage to capital assets	$ 1,500
Damage from Fire, Explosion or Other Hazard [Member]
Fire Note [Line Items]
Advance payment of insurance	$ 1,500

X

- Definition

Costs incurred related extraordinary fire event.

+ References

No definition available.

+ Details

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Namespace Prefix:	jbss_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Amount of insurance proceeds for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233

+ Details

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

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- Details

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Namespace Prefix:
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