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Fair Value Measurements (Narrative) (Details)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
Apr. 02, 2017
USD ($)
Jan. 03, 2016
USD ($)
Jan. 01, 2017
USD ($)
Jul. 19, 2016
EUR (€)
Apr. 03, 2016
USD ($)
Oct. 25, 2011
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 83,000          
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value $ 63,978 $ 57,350 $ 63,201   $ 58,579  
Business Combination, Contingent Consideration Arrangements, Description Contingent consideration is measured at fair value at the acquisition date, based on the probability that revenue thresholds or product development milestones will be achieved during the earnout period, with changes in the fair value after the acquisition date affecting earnings to the extent it is to be settled in cash.          
Business Combination, Contingent Consideration Arrangements, Maximum Period 2 years 6 months          
Business Combination, Contingent Consideration Arrangements, Weighted Average Period 1 year 7 months          
Line of Credit, Maturing August 11, 2021 [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000          
Revolving credit facility outstanding balance 0          
Unamortized Debt Issuance Expense 4,000   4,300      
Long-term Debt 0   0      
2021 Notes [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Unamortized Debt Issuance Expense 2,400   2,500      
Unsecured senior notes, face value 500,000         $ 500,000
Long-term Debt 496,000   495,800      
Debt Instrument, Unamortized Discount (1,700)   (1,700)     $ (3,100)
Unsecured senior notes, fair value 541,300   539,200      
1.875 Percent Ten Year Senior Unsecured Notes [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Unamortized Debt Issuance Expense 4,700   4,800      
Unsecured senior notes, face value 500,000     € 500.0    
Long-term Debt 525,100   517,800      
Debt Instrument, Unamortized Discount (4,400)   (4,500) € (4.4)    
Unsecured senior notes, fair value 500,900   507,500      
Financing Lease Obligations [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Unsecured senior notes, fair value 36,800   $ 37,100      
Vanadis Diagnostics AB [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Payments to Acquire Businesses, Net of Cash Acquired   32,000        
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred, Contingent Consideration at Fair Value $ 63,978 56,878        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High   $ 93,000        
Minimum [Member] | Vanadis Diagnostics AB [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Projected milestone date 2017          
Fair Value Inputs, Discount Rate 2.20%          
Conditional probability of success 90.00%          
Cumulative probability of success 66.00%          
Maximum [Member] | Vanadis Diagnostics AB [Member]            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Projected milestone date 2019          
Fair Value Inputs, Discount Rate 7.00%          
Conditional probability of success 95.00%          
Cumulative probability of success 95.00%