Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 390.6	$ 514.5	$ 283.3
Foreign currency translation adjustments, net of tax $0.5 in 2020, and $0.1 in 2019 and 2018, respectively	77.1	10.3	(55.6)
Net unrealized gain (loss), net of tax	1.2	(1.0)	0.9
Comprehensive income	468.9	523.8	228.6
Comprehensive income attributable to noncontrolling interests	0.7	0.2	0.5
Comprehensive income attributable to Trimble Inc.	$ 468.2	$ 523.6	$ 228.1