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Supplemental Consolidated Cash Flow Information (Additional Information Related To Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
4 Months Ended
Jan. 18, 2015
Jan. 19, 2014
Supplemental Cash Flow Information [Abstract]    
Interest, net of amounts capitalized $ 5,115us-gaap_InterestPaidNet $ 5,357us-gaap_InterestPaidNet
Income tax payments 152us-gaap_IncomeTaxesPaidNet 16,684us-gaap_IncomeTaxesPaidNet
Dividends Payable 35jack_DividendspayableIncreasedecreaseperiod 0jack_DividendspayableIncreasedecreaseperiod
Capital Expenditures Incurred but Not yet Paid $ 7,829us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 8,248us-gaap_CapitalExpendituresIncurredButNotYetPaid