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Note 2- Revenue Recognition (Details Textual) - USD ($) $ in Millions	Dec. 30, 2023	Sep. 30, 2023
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