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Balance Sheet Account Details - Narrative - Warranties (Details)
9 Months Ended
Oct. 01, 2017
Instruments [Member]  
Product Warranty Liability [Line Items]  
Warranty period 1 year
Consumables [Member] | Minimum [Member]  
Product Warranty Liability [Line Items]  
Warranty period 6 months
Consumables [Member] | Maximum [Member]  
Product Warranty Liability [Line Items]  
Warranty period 12 months