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Fair Value Measurements (Narrative) (Details)
$ in Thousands, € in Millions
6 Months Ended 12 Months Ended
Jul. 05, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jan. 03, 2016
USD ($)
Jul. 05, 2020
EUR (€)
Apr. 05, 2020
USD ($)
Dec. 29, 2019
USD ($)
Dec. 29, 2019
EUR (€)
Sep. 12, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 30, 2018
USD ($)
Apr. 11, 2018
USD ($)
Jul. 19, 2016
EUR (€)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High $ 21,100                      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value $ 13,726 $ 34,261     $ 22,777 $ 35,481     $ 34,349 $ 69,661    
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 11 months                      
Payments for acquisition related contingent consideration $ (5,200) $ (23,700)                    
Line of Credit, Maturing September 17, 2024 [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 221,800         325,400            
Unamortized Debt Issuance Expense 3,000         3,400            
1.875 Percent Ten Year Senior Unsecured Notes [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Unamortized Debt Issuance Expense 3,000         3,300            
Unsecured senior notes, face value | €                       € 500.0
Debt Instrument, Unamortized Discount (3,200)         (3,500)           € (4.4)
1.875 Percent Ten Year Senior Unsecured Notes [Member] | Euro Member Countries, Euro                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Unsecured senior notes, fair value 514,200         518,500            
0.6 Percent Senior Unsecured Notes due in April 2021 [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Unamortized Debt Issuance Expense 700         1,100            
Unsecured senior notes, face value                     $ 300,000  
Debt Instrument, Unamortized Discount (43)         (100)         $ (200)  
Unsecured senior notes, fair value 298,900         301,900            
3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Unamortized Debt Issuance Expense 7,200         7,400            
Unsecured senior notes, face value               $ 850,000        
Debt Instrument, Unamortized Discount (2,600)         (2,700)   $ (2,800)        
Unsecured senior notes, fair value 909,500         872,300            
Other Debt Facilities - EUROIMMUN [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Long-term Debt, Percentage Bearing Fixed Interest, Amount | €       € 19.8                
Other Debt Facilities - EUROIMMUN [Member] | Euro Member Countries, Euro                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Other Long-term Debt | €       € 16.7     € 21.3          
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 $ 8,800   56,900                  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 93,000                  
Maximum [Member] | Vanadis Diagnostics AB [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Projected milestone date 2020                      
Conditional probability of success 90.00%     90.00%                
Measurement Inputs, Discount Rate 5.70%                      
Significant Other Observable Inputs (Level 2) [Member] | Line of Credit, Maturing September 17, 2024 [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Long-term Debt $ 218,800         322,000            
Significant Other Observable Inputs (Level 2) [Member] | 1.875 Percent Ten Year Senior Unsecured Notes [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Long-term Debt 555,900         552,200            
Significant Other Observable Inputs (Level 2) [Member] | 0.6 Percent Senior Unsecured Notes due in April 2021 [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Long-term Debt 336,600         334,200            
Significant Other Observable Inputs (Level 2) [Member] | 3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Long-term Debt $ 840,200         $ 839,900            
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Facilities - EUROIMMUN [Member]                        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                        
Other Long-term Debt | €       € 19.9     € 25.7