Condensed Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 28, 2018	Sep. 29, 2017		Sep. 28, 2018	Sep. 29, 2017
Revenue:
Revenue	$ 795.2	$ 676.2	[1]	$ 2,322.9	$ 1,946.7	[1]
Cost of sales:
Cost of Sales	368.3	325.0	[1]	1,077.1	928.6	[1]
Amortization of purchased intangible assets	28.2	23.0	[1]	75.2	62.5	[1]
Gross Profit	426.9	351.2	[1]	1,245.8	1,018.1	[1]
Operating expense:
Research and development	114.1	92.6	[1]	333.5	272.1	[1]
Sales and marketing	119.7	100.0	[1]	354.6	294.5	[1]
General and administrative	91.6	74.0	[1]	262.6	218.4	[1]
Restructuring charges	2.5	1.3	[1]	6.3	6.5	[1]
Amortization of purchased intangible assets	21.6	17.0	[1]	57.7	46.6	[1]
Total operating expense	349.5	284.9	[1]	1,014.7	838.1	[1]
Operating income	77.4	66.3	[1],[2]	231.1	180.0	[1],[2]
Non-operating income (expense), net:
Interest expense, net	(22.7)	(6.3)	[1]	(50.8)	(18.4)	[1]
Foreign currency transaction gain (loss), net	(0.1)	1.6	[1]	0.6	3.0	[1]
Income from equity method investments, net	8.8	8.7	[1]	23.2	22.8	[1]
Other income, net	0.7	1.6	[1]	5.9	12.2	[1]
Total non-operating income (expense), net	(13.3)	5.6	[1],[2]	(21.1)	19.6	[1],[2]
Income before taxes	64.1	71.9	[1],[2]	210.0	199.6	[1],[2]
Income tax provision (benefit)	(9.6)	14.7	[1]	13.5	45.3	[1]
Net income	73.7	57.2	[1],[3]	196.5	154.3	[1],[3],[4]
Net gain attributable to noncontrolling interests	0.0	0.0	[3]	0.2	0.0	[3]
Net income attributable to Trimble Inc.	$ 73.7	$ 57.2	[1]	$ 196.3	$ 154.3	[1]
Basic earnings per share	$ 0.29	$ 0.23	[1]	$ 0.79	$ 0.61	[1]
Shares used in calculating basic earnings per share	250.5	252.6	[1]	249.6	252.5	[1]
Diluted earnings per share	$ 0.29	$ 0.22	[1]	$ 0.78	$ 0.60	[1]
Shares used in calculating diluted earnings per share	253.6	257.9	[1]	253.0	257.0	[1]
Product [Member]
Revenue:
Revenue	$ 499.7	$ 449.4	[1]	$ 1,528.5	$ 1,304.4	[1]
Cost of sales:
Cost of Sales	237.5	226.8	[1]	723.1	642.6	[1]
Service [Member]
Revenue:
Revenue	156.5	124.3	[1]	421.4	342.8	[1]
Cost of sales:
Cost of Sales	64.6	46.9	[1]	183.8	141.1	[1]
Subscription Arrangement [Member]
Revenue:
Revenue	139.0	102.5	[1]	373.0	299.5	[1]
Cost of sales:
Cost of Sales	$ 38.0	$ 28.3	[1]	$ 95.0	$ 82.4	[1]

[1] See Note 2 for a summary of adjustments

[2] See Note 2 for a summary of adjustments

[3] See Note 2 for a summary of adjustments

[4] See Note 2 for a summary of adjustments