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Note 10 (Detail) - Intagible Assets by Reporting Segment (USD $) In Thousands, unless otherwise specified	Dec. 29, 2012	Sep. 29, 2012
Gross carrying amount	$ 79,095	$ 79,095
Accumulated amortization	31,750	30,631
Food Service [Member] | Trade Names [Member]
Gross carrying amount of indefinite lived intangible assets	12,880	12,880
Food Service [Member] | Noncompete Agreements [Member]
Gross carrying amount of amortized intangible assets	545	545
Accumulated amortization of amortized intangible assets	461	456
Food Service [Member] | Customer Relationships [Member]
Gross carrying amount of amortized intangible assets	40,187	40,187
Accumulated amortization of amortized intangible assets	23,483	22,582
Food Service [Member] | License and Rights [Member]
Gross carrying amount of amortized intangible assets	3,606	3,606
Accumulated amortization of amortized intangible assets	2,543	2,519
Food Service [Member]
Gross carrying amount	57,218	57,218
Accumulated amortization	26,487	25,557
Retail Supermarket [Member] | Trade Names [Member]
Gross carrying amount of indefinite lived intangible assets	4,006	4,006
Retail Supermarket [Member] | Customer Relationships [Member]
Gross carrying amount of amortized intangible assets	279	279
Accumulated amortization of amortized intangible assets	39	31
Retail Supermarket [Member]
Gross carrying amount	4,285	4,285
Accumulated amortization	39	31
Frozen Beverages [Member] | Trade Names [Member]
Gross carrying amount of indefinite lived intangible assets	9,315	9,315
Frozen Beverages [Member] | Noncompete Agreements [Member]
Gross carrying amount of amortized intangible assets	198	198
Accumulated amortization of amortized intangible assets	198	198
Frozen Beverages [Member] | Customer Relationships [Member]
Gross carrying amount of amortized intangible assets	6,478	6,478
Accumulated amortization of amortized intangible assets	4,364	4,201
Frozen Beverages [Member] | License and Rights [Member]
Gross carrying amount of amortized intangible assets	1,601	1,601
Accumulated amortization of amortized intangible assets	662	644
Frozen Beverages [Member]
Gross carrying amount	17,592	17,592
Accumulated amortization	$ 5,224	$ 5,043

X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	jjsf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

No authoritative reference available.

+ References

No definition available.

+ Details

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Namespace Prefix:	jjsf_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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X

- Definition

Carrying amount of assets (excluding financial assets) that lack physical substance, excluding goodwill, having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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