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Note 3 (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 25, 2017
Mar. 31, 2018
Mar. 25, 2017
Depreciation, Total $ 10,208,000 $ 9,703,000 $ 21,360,000 $ 18,431,000
Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life     3 years  
Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life     20 years