Long-Term Debt (Narrative) (Details) - USD ($)				1 Months Ended	12 Months Ended
	Mar. 22, 2021	Mar. 17, 2021	Jan. 04, 2021	Feb. 28, 2022	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019	Mar. 04, 2021
Line of Credit Facility [Line Items]
Debt extinguishment cost		$ 13,400,000
Interest expense					$ 104,800,000	$ 15,800,000	$ 22,000,000
Letters of credit
Line of Credit Facility [Line Items]
Outstanding balance					281,900,000
Letters of credit | Subsequent Event
Line of Credit Facility [Line Items]
Repayments				$ 244,600,000
Senior notes
Line of Credit Facility [Line Items]
Debt called		$ 493,300,000
Debt face	$ 3,000,000,000
Credit facility
Line of Credit Facility [Line Items]
Debt face								$ 1,000,000,000
Maximum borrowing capacity								1,000,000,000
Credit facility | Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity					1,150,000,000
Remaining borrowing capacity under credit facility					$ 759,200,000
Short Term Stand-by Bridge Facility | Bridge facility
Line of Credit Facility [Line Items]
Bridge facility	4,500,000,000
Short Term Stand-by Bridge Facility | Bridge facility | FLIR
Line of Credit Facility [Line Items]
Bridge facility			$ 4,500,000,000
Interest expense			$ 17,200,000
0.65% Fixed Rate Senior Notes due April 2023 | Senior notes
Line of Credit Facility [Line Items]
Debt face	$ 300,000,000
Interest rate	0.65%				0.65%
0.95% Fixed Rate Senior Notes due April 2024, callable after April 2022 | Senior notes
Line of Credit Facility [Line Items]
Debt face	$ 450,000,000
Interest rate	0.95%				0.95%
Redemption price percentage	100.00%
1.60% Fixed Rate Senior Notes due April 2026 | Senior notes
Line of Credit Facility [Line Items]
Debt face	$ 450,000,000
Interest rate	1.60%				1.60%
2.25% Fixed Rate Senior Notes due April 2028 | Senior notes
Line of Credit Facility [Line Items]
Debt face	$ 700,000,000
Interest rate	2.25%				2.25%
2.75% Fixed Rate Senior Notes due April 2031 | Senior notes
Line of Credit Facility [Line Items]
Debt face	$ 1,100,000,000
Interest rate	2.75%				2.75%
2.50% Fixed Rate Senior Notes due April 2030 | Senior notes
Line of Credit Facility [Line Items]
Interest rate					2.50%
2.50% Fixed Rate Senior Notes due April 2030 | Senior notes | FLIR | Guarantee
Line of Credit Facility [Line Items]
Debt face					$ 500,000,000
Interest rate					2.50%
Term Loan Credit Agreement | Credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity								1,000,000,000
Amended and Restated Credit Agreement | Credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity								$ 1,150,000,000
Amended and Restated Credit Agreement | Credit facility | Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity					$ 1,150,000,000