Debt (Details)		6 Months Ended
	Mar. 08, 2021 USD ($)	Jul. 04, 2021 USD ($)	Jul. 04, 2021 EUR (€)	Jan. 03, 2021 USD ($)
Debt Instrument, Unamortized Discount		$ (5,412,000)		$ (5,765,000)
Unamortized Debt Issuance Expense		(19,459,000)		(12,540,000)
Debt, Long-term and Short-term, Combined Amount		2,378,063,000		2,008,954,000
Long-term Debt, Gross		2,373,394,000		1,627,761,000
Current portion of long-term debt		4,669,000		380,948,000
Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt		2,348,523,000		1,609,701,000
Debt, Long-term and Short-term, Combined Amount		2,353,192,000		1,990,649,000
2.55 Percent Senior Unsecured Notes due in 2031 [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.55%
Unsecured senior notes, face value	$ 400,000,000.0
Gross proceeds from the issuance of debt instrument	$ 399,900,000
Senior unsecured notes issuance as percentage of principal amount	99.965%
Debt Instrument, Unamortized Discount	$ (100,000)	(136,000)
Percentage of redemption upon a change of control and a contemporaneous downgrade of the Notes	101.00%
Unamortized Debt Issuance Expense		(3,563,000)
Long-term Debt, Gross		400,000,000
2.55 Percent Senior Unsecured Notes due in 2031 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt		$ 396,301,000
2.55 Percent Senior Unsecured Notes due in 2031 [Member] | Treasury Rate [Member]
Basis spread on variable rate		0.15%
3.625 Percent Senior Unsecured Notes due in 2051 [Member]
Debt Instrument, Interest Rate, Stated Percentage	3.625%
Unsecured senior notes, face value	$ 400,000,000.0
Gross proceeds from the issuance of debt instrument	$ 400,000,000.00
Senior unsecured notes issuance as percentage of principal amount	99.999%
Debt Instrument, Unamortized Discount	$ (4,000)	$ (4,000)
Percentage of redemption upon a change of control and a contemporaneous downgrade of the Notes	101.00%
Unamortized Debt Issuance Expense		(4,545,000)
Long-term Debt, Gross		400,000,000
3.625 Percent Senior Unsecured Notes due in 2051 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt		$ 395,451,000
3.625 Percent Senior Unsecured Notes due in 2051 [Member] | Treasury Rate [Member]
Basis spread on variable rate		0.20%
0.6 Percent Senior Unsecured Notes due in April 2021 [Member]
Debt Instrument, Unamortized Discount				(16,000)
Unamortized Debt Issuance Expense				(229,000)
Current portion of long-term debt				366,450,000
0.6 Percent Senior Unsecured Notes due in April 2021 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Current portion of long-term debt				366,205,000
3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member]
Debt Instrument, Unamortized Discount		$ (2,368,000)		(2,496,000)
Unamortized Debt Issuance Expense		(6,556,000)		(6,908,000)
Long-term Debt, Gross		850,000,000		850,000,000
3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member] | Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt		$ 841,076,000		840,596,000
Other Debt Facilities - EUROIMMUN [Member]
Long-term Debt, Percentage Bearing Variable Interest, Amount | €			€ 23,000
Other Debt Facilities - EUROIMMUN [Member] | Euribor Rate [Member]
Basis spread on variable rate		1.50%
Line of Credit, Maturing September 17, 2024 [Member]
Debt Instrument, Unamortized Discount		$ 0		0
Long-term Debt		122,736,000		155,974,000
Unamortized Debt Issuance Expense		(2,264,000)		(2,621,000)
Revolving credit facility outstanding balance		125,000,000		158,595,000
1.875 Percent Ten Year Senior Unsecured Notes [Member]
Debt Instrument, Unamortized Discount		(2,904,000)		(3,253,000)
Unamortized Debt Issuance Expense		(2,531,000)		(2,782,000)
Long-term Debt, Gross		592,300,000		610,750,000
1.875 Percent Ten Year Senior Unsecured Notes [Member] | Significant Other Observable Inputs (Level 2) [Member]
Long-term Debt		586,865,000		604,715,000
Other Debt Facilities - Current [Member]
Debt Instrument, Unamortized Discount		0		0
Other Long-term Debt, Current		4,669,000		14,743,000
Unamortized Debt Issuance Expense		0		0
Other Debt Facilities - Current [Member] | Significant Other Observable Inputs (Level 2) [Member]
Other Long-term Debt, Current		4,669,000		14,743,000
Other Debt Facilities - Non-current [Member]
Debt Instrument, Unamortized Discount		0		0
Other Long-term Debt, Noncurrent		6,094,000		8,416,000
Unamortized Debt Issuance Expense		0		0
Other Debt Facilities - Non-current [Member] | Significant Other Observable Inputs (Level 2) [Member]
Other Long-term Debt, Noncurrent		6,094,000		8,416,000
Other Debt Facilities, excluding the senior revolving credit facility [Member]
Long-term Debt, Percentage Bearing Fixed Interest, Amount | €			€ 10,700,000
Long-term Debt [Member]
Debt Instrument, Unamortized Discount		(5,412,000)		(5,749,000)
Unamortized Debt Issuance Expense		$ (19,459,000)		$ (12,311,000)
Minimum [Member] | Other Debt Facilities, excluding the senior revolving credit facility [Member]
Debt Instrument, Interest Rate, Stated Percentage		1.10%	1.10%
Maximum [Member] | Other Debt Facilities, excluding the senior revolving credit facility [Member]
Debt Instrument, Interest Rate, Stated Percentage		8.90%	8.90%