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Business Acquisitions (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Nov. 21, 2018
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Business Acquisition [Line Items]          
Revenue   $ 233,046 $ 191,323 $ 436,227 $ 385,485
E2M Technologies B.V.          
Business Acquisition [Line Items]          
Cash paid at closing $ 80,287        
Revenue   $ 10,138   13,659  
Acquisition costs       $ 1,035  
Intangible assets $ 43,932