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Consolidated Balance Sheets (Parenthetical)
$ in Thousands
Dec. 30, 2017
USD ($)
shares
Dec. 30, 2017
SFr / shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2016
SFr / shares
Allowance for doubtful accounts | $ $ 4,168   $ 14,669  
Common shares, authorized 198,077   198,077  
Common shares, issued 198,077   198,077  
Common shares, outstanding 188,189   188,565  
CHF [Member]        
Common shares, par value (in swiss francs per share) | SFr / shares   SFr 0.10   SFr 0.10