Commitments and Contingencies (Details) $ in Millions		1 Months Ended	12 Months Ended
	Apr. 24, 2018 USD ($) audit	Apr. 30, 2021 USD ($) audit	Jan. 02, 2022 USD ($) subsidiary	Jan. 03, 2021 USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Reserves for environmental remediation obligations			$ 6.3	$ 6.5
Portion of reserves included in current accrued liabilities			$ 1.7
FLIR | Sweden
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Non-operating subsidiary | subsidiary			1
Maximum
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Estimated duration of environmental remediation of all sites			30 years
FLIR | DDTC
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Consent agreement term	4 years
Civil penalty	$ 30.0
Suspended	$ 15.0
External audits | audit	2
Remaining to be paid			$ 3.5
FLIR | BIS
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Settlement and fine		$ 0.3
Internal audits | audit		2