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Goodwill (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Goodwill [Abstract]    
Goodwill, balance at beginning of period $ 11,196 $ 14,292
Acquisitions 2,338
Amount attributable to movements in foreign currency rates (14) 42
Goodwill, Balance at end of period $ 11,182 $ 16,672