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Note 4 (Details) - Calculation of EPS (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Basic EPS    
Income (Numerator) (in Dollars) $ 11,256us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 12,426us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Shares (Denominator) 18,669us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,679us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Per Share Amount (in Dollars per share) $ 0.60us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic
Effect of Dilutive Securities    
Options 132us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 114us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Options (in Dollars per share)   $ (0.01)jjsf_EffectOfDilutiveSecuritiesOptionsPerShare
Diluted EPS    
Income (Numerator) (in Dollars) $ 11,256us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 12,426us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Shares (Denominator) 18,801us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,793us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per Share Amount (in Dollars per share) $ 0.60us-gaap_EarningsPerShareDiluted $ 0.66us-gaap_EarningsPerShareDiluted