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Note 12 (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 5 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 28, 2015 | Mar. 29, 2014 | Mar. 28, 2015 | Mar. 29, 2014 | Sep. 27, 2014 | Sep. 27, 2014 | Oct. 31, 2013 | May 31, 2014
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Goodwill, Acquired During Period | $ 0 us-gaap_GoodwillAcquiredDuringPeriod |  | $ 0 us-gaap_GoodwillAcquiredDuringPeriod |  |  |  |  |
Revenues | 225,008,000 us-gaap_Revenues | 205,321,000 us-gaap_Revenues | 437,760,000 us-gaap_Revenues | 408,844,000 us-gaap_Revenues |  |  |  |
Food Service [Member] | New York Pretzel [Member] |  |  |  |  |  |  |  |
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Revenues |  |  |  |  | 4,300,000 us-gaap_Revenues / us-gaap_BusinessAcquisitionAxis = jjsf_NewYorkPretzelMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember |  |  |
Food Service [Member] |  |  |  |  |  |  |  |
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Revenues | 145,262,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 138,329,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 288,823,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember | 277,109,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_FoodServiceMember |  |  |  |
Retail Supermarket [Member] | PHILLY SWIRL [Member] |  |  |  |  |  |  |  |
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual |  |  |  |  |  | 12,600,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember |  |
Retail Supermarket [Member] |  |  |  |  |  |  |  |
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Revenues | 28,533,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 23,050,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 50,920,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember | 43,214,000 us-gaap_Revenues / us-gaap_StatementBusinessSegmentsAxis = jjsf_RetailSupermarketMember |  |  |  |
New York Pretzel [Member] |  |  |  |  |  |  |  |
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  | 11,800,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = jjsf_NewYorkPretzelMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  | 849,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = jjsf_NewYorkPretzelMember |
Goodwill, Acquired During Period |  |  |  |  |  |  | 7,716,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = jjsf_NewYorkPretzelMember |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  | 3,049,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = jjsf_NewYorkPretzelMember |
PHILLY SWIRL [Member] |  |  |  |  |  |  |  |
Note 12 (Details) [Line Items] |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |  |  |  | 17,400,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  |  |  | 11,100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Goodwill, Acquired During Period |  |  |  |  |  |  |  | 1,800,000 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  |  |  | 1,200,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Acquisition, Revenue Reported by Acquired Entity for Last Annual Period |  |  |  |  |  |  |  | 25,000,000 us-gaap_BusinessAcquisitionRevenueReportedByAcquiredEntityForLastAnnualPeriod / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Acquired |  |  |  |  |  |  |  | 4,000,000 jjsf_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedWorkingCapitalAcquired / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent |  |  |  |  |  |  |  | 4,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxAssetsNoncurrent / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  |  |  | 95,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent |  |  |  |  |  |  |  | $ 4,800,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = jjsf_PHILLYSWIRLMember

X
- Definition The amount of working capital recognized as of the acquisition date. + References No definition available. + Details
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- Definition Total revenue reported by the acquired entity for its previous full fiscal year before the business acquisition. + References No definition available. + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of deferred tax asset attributable to deductible temporary differences and carryforwards that are expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of other assets expected to be realized or consumed after one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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X
- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + 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) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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