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Note B - Acquisitions - Purchase Price Allocation for Acquisitions (Details) - Dippin’ Dots Holding, L.L.C. [Member] - USD ($) $ in Thousands | 12 Months Ended
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Sep. 28, 2024 | Sep. 30, 2023 | Sep. 24, 2022
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual | $ 95,273 | $ 95,963 | $ 33,734
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual | $ 12,852 | $ 13,005 | $ 4,859

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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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Period Type: | duration

X
- 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479328/805-10-50-2 + Details
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Data Type: | xbrli:monetaryItemType
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- Details
Name: | us-gaap_BusinessAcquisitionAxis=jjsf_DippinDotsHoldingLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |