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Commitments And Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2017
Oct. 01, 2016
Oct. 03, 2015
Sep. 27, 2014
Impaired Long-Lived Assets Held and Used [Line Items]        
Total lease expense   $ 7,053 $ 5,787 $ 5,687
Scenario, Forecast [Member]        
Impaired Long-Lived Assets Held and Used [Line Items]        
Tangible asset impairment charges $ 5,000      
Intangible asset impairment $ 22,000