Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 29, 2017	Dec. 30, 2016	Jan. 01, 2016
Income Statement [Abstract]
Product		$ 1,763.8	$ 1,562.0	$ 1,533.5
Service		461.6	430.2	419.9
Subscription		428.8	370.0	337.0
Total revenues	[1]	2,654.2	2,362.2	2,290.4
Product		866.5	760.8	731.1
Service		196.3	169.9	164.2
Subscription		113.0	104.9	100.3
Amortization of purchased intangible assets		85.8	88.6	92.6
Total cost of sales		1,261.6	1,124.2	1,088.2
Gross margin		1,392.6	1,238.0	1,202.2
Operating expense
Research and development		370.2	349.6	336.7
Sales and marketing		404.2	377.6	374.6
General and administrative		302.3	256.0	255.3
Restructuring charges		6.9	11.6	11.4
Amortization of purchased intangible assets		63.0	62.2	69.8
Total operating expense		1,146.6	1,057.0	1,047.8
Operating income		246.0	181.0	154.4
Non-operating income (expense), net
Interest expense, net		(25.0)	(25.9)	(25.6)
Foreign currency transaction gain (loss), net		3.3	(1.9)	0.2
Income from equity method investments, net		29.5	17.6	17.9
Other income, net		5.3	5.9	4.9
Total non-operating income (expense), net		13.1	(4.3)	(2.6)
Income before taxes		259.1	176.7	151.8
Income tax provision		137.9	44.5	31.1
Net income		121.2	132.2	120.7
Net gain (loss) attributable to noncontrolling interests		0.1	(0.2)	(0.4)
Net income attributable to Trimble Inc.		$ 121.1	$ 132.4	$ 121.1
Basic earnings per share		$ 0.48	$ 0.53	$ 0.47
Shares used in calculating basic earnings per share		252.1	250.5	255.8
Diluted earnings per share		$ 0.47	$ 0.52	$ 0.47
Shares used in calculating diluted earnings per share		256.7	253.9	258.5

[1] Revenue is attributed to countries based on the location of the customer.