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Note J - Commitments (Details)	12 Months Ended
	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Sep. 28, 2013 USD ($)	Sep. 27, 2015 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense	$ 16,448,000	$ 15,163,000	$ 13,575,000
Accrued Insurance	8,200,000	8,100,000
Letters of Credit Outstanding, Amount		9,075,000		$ 9,075,000
Number Of Employees				1,500
Self Insurance Reserve	$ 1,659,000	$ 1,853,000

X

- Definition

Represents the number of employees.

+ References

No definition available.

+ Details

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Namespace Prefix:	jjsf_
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Balance Type:	na
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X

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable to insurance entities to mitigate potential loss from various risks or to satisfy a promise to provide certain coverage's to employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.15(5))



-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 944



-SubTopic 210



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-03.15(5))



-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 03



-Paragraph 15



-Subparagraph a



-Article 7

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X

- References

No definition available.

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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

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

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

X

- Definition

Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.24)



-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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