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Note 2- Revenue Recognition (Details Textual) - USD ($) $ in Millions | Dec. 30, 2023 | Sep. 30, 2023
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Contract with Customer, Asset, Allowance for Deductions | $ 17.8 | $ 18.9

X
- Definition Represents the amount of allowance for deductions for right to consideration in exchange for good or service transferred to customer. + References No definition available. + Details
Name: | jjsf_ContractWithCustomerAssetAllowanceForDeductions
Namespace Prefix: | jjsf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant