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Note 10 (Details) - Goodwill by Reporting Segment (USD $) In Thousands, unless otherwise specified | Mar. 28, 2015 | Sep. 27, 2014
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Goodwill [Line Items] |  |
Balance | $ 86,442 us-gaap_GoodwillGross | $ 86,442 us-gaap_GoodwillGross
Food Service [Member] |  |
Goodwill [Line Items] |  |
Balance | 46,832 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 46,832 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember
Retail Supermarket [Member] |  |
Goodwill [Line Items] |  |
Balance | 3,670 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 3,670 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember
Frozen Beverages [Member] |  |
Goodwill [Line Items] |  |
Balance | $ 35,940 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember | $ 35,940 us-gaap_GoodwillGross / us-gaap_StatementBusinessSegmentsAxis = jjsf_FrozenBeveragesMember

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- Definition Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a,h) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jjsf_FoodServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jjsf_FrozenBeveragesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=jjsf_RetailSupermarketMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |