Earnings Per Share (Schedule Of Computation Of Earnings Per Share And Effect On Weighted-Average Number Of Shares) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2021	Jul. 03, 2020	Jul. 02, 2021	Jul. 03, 2020
Numerator:
Net income attributable to Trimble Inc.	$ 138.9	$ 63.0	$ 253.4	$ 124.9
Denominator:
Weighted average number of common shares used in basic earnings per share (in shares)	251,500	250,000	251,300	250,000
Effect of dilutive securities (in shares)	2,700	1,200	2,900	1,500
Weighted average number of common shares and dilutive potential common shares used in diluted earnings per share (in shares)	254,200	251,200	254,200	251,500
Basic earnings per share (in dollars per share)	$ 0.55	$ 0.25	$ 1.01	$ 0.50
Diluted (in dollars per share)	$ 0.55	$ 0.25	$ 1.00	$ 0.50
Antidilutive shares (in shares)	100	2,100	200	1,800