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Fair Value Measurements (Narrative) (Details)
$ in Thousands, € in Millions
6 Months Ended 12 Months Ended
Jul. 02, 2017
USD ($)
Jan. 03, 2016
USD ($)
Apr. 02, 2017
USD ($)
Jan. 01, 2017
USD ($)
Jul. 19, 2016
EUR (€)
Jul. 03, 2016
USD ($)
Apr. 03, 2016
USD ($)
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 $ 64,076 $ 57,350 $ 63,978 $ 63,201   $ 62,878 $ 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 3 months              
Business Combination, Contingent Consideration Arrangements, Weighted Average Period 1 year 6 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     0        
Unamortized Debt Issuance Expense 3,800     4,300        
2021 Notes [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Unamortized Debt Issuance Expense 2,300     2,500        
Unsecured senior notes, face value               $ 500,000
Long-term Debt 496,200     495,800        
Debt Instrument, Unamortized Discount (1,600)     (1,700)       $ (3,100)
Unsecured senior notes, fair value 545,700     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 4,500     4,800        
Unsecured senior notes, face value | €         € 500.0      
Long-term Debt 561,800     517,800        
Debt Instrument, Unamortized Discount (4,600)     (4,500) € (4.4)      
Unsecured senior notes, fair value 504,700     $ 507,500        
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 $ 64,078 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 2018              
Fair Value Inputs, Discount Rate 2.40%              
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 7.10%              
Conditional probability of success 95.00%              
Cumulative probability of success 95.00%