Condensed Consolidated Statements of Stockholders' Equity Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]
Common stock, shares outstanding		248.9
Total stockholders' equity at Dec. 29, 2017	$ 2,414.5	$ 0.2	$ 1,461.1	$ 1,084.6	$ (131.4)	$ 2,414.5	$ 0.0
Net income attributable to Trimble Inc.	58.5					58.5
Net gain attributable to noncontrolling interests	0.2
Net income	58.7
Other Comprehensive Income	30.3				30.3	30.3
Comprehensive Income attributable to Parent	88.8
Comprehensive income	89.0
Issuance of common stock under employee plans, net of tax withholdings, Shares		1.1
Issuance of common stock under employee plans, net of tax withholdings, Value	28.8		25.8			28.8
Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options				3.0
Stock Repurchases, Shares		(1.3)
Stock Repurchases, Value	(50.0)		(7.5)	(42.5)		(50.0)
Stock-based Compensation	17.6		17.6			17.6
Total stockholders' equity at Mar. 30, 2018	2,499.9	$ 0.2	1,497.0	1,103.6	(101.1)	2,499.7	0.2
Total stockholders' equity at Dec. 29, 2017	2,414.5	0.2	1,461.1	1,084.6	(131.4)	2,414.5	0.0
Net income attributable to Trimble Inc.	122.6
Net gain attributable to noncontrolling interests	0.2
Net income	122.8
Comprehensive Income attributable to Parent	92.8
Comprehensive income	93.0
Total stockholders' equity at Jun. 29, 2018	2,517.6	$ 0.2	1,524.4	1,154.0	(161.2)	2,517.4	0.2
Common stock, shares outstanding		248.7
Total stockholders' equity at Mar. 30, 2018	2,499.9	$ 0.2	1,497.0	1,103.6	(101.1)	2,499.7	0.2
Net income attributable to Trimble Inc.	64.1					64.1
Net gain attributable to noncontrolling interests	0.0
Net income	64.1
Other Comprehensive Income	(60.1)				(60.1)	(60.1)
Comprehensive Income attributable to Parent	4.0
Comprehensive income	4.0
Issuance of common stock under employee plans, net of tax withholdings, Shares		1.2
Issuance of common stock under employee plans, net of tax withholdings, Value			10.2
Adjustments Related to Tax Withholding for Share-based Compensation	3.5			13.7		3.5
Stock Repurchases, Shares		0.0
Stock Repurchases, Value	0.0		0.0	0.0		0.0
Stock-based Compensation	17.2		17.2			17.2
Total stockholders' equity at Jun. 29, 2018	$ 2,517.6	$ 0.2	1,524.4	1,154.0	(161.2)	2,517.4	0.2
Common stock, shares outstanding		249.9
Common stock, shares outstanding	250.9	250.9
Total stockholders' equity at Dec. 28, 2018	$ 2,674.8	$ 0.3	1,591.9	1,268.3	(186.1)	2,674.4	0.4
Net income attributable to Trimble Inc.	62.3					62.3
Net gain attributable to noncontrolling interests	0.1
Net income	62.4
Other Comprehensive Income	3.6				3.6	3.6
Comprehensive Income attributable to Parent	65.9
Comprehensive income	66.0
Issuance of common stock under employee plans, net of tax withholdings, Shares		1.6
Issuance of common stock under employee plans, net of tax withholdings, Value	25.6		33.3			25.6
Adjustments Related to Tax Withholding for Share-based Compensation				7.7
Stock Repurchases, Shares		(1.0)
Stock Repurchases, Value	(40.0)		(6.5)	(33.5)		(40.0)
Stock-based Compensation	16.6		16.6			16.6
Noncontrolling Interest Investments	0.0		(0.8)			(0.8)	0.8
Total stockholders' equity at Mar. 29, 2019	2,743.0	$ 0.3	1,634.5	1,289.4	(182.5)	2,741.7	1.3
Total stockholders' equity at Dec. 28, 2018	2,674.8	0.3	1,591.9	1,268.3	(186.1)	2,674.4	0.4
Net income attributable to Trimble Inc.	156.9
Net gain attributable to noncontrolling interests	0.1
Net income	157.0
Comprehensive Income attributable to Parent	162.6
Comprehensive income	162.7
Stock Repurchases, Value				(49.6)
Total stockholders' equity at Jun. 28, 2019	2,825.3	$ 0.3	1,649.7	1,354.4	(180.4)	2,824.0	1.3
Common stock, shares outstanding		251.5
Total stockholders' equity at Mar. 29, 2019	2,743.0	$ 0.3	1,634.5	1,289.4	(182.5)	2,741.7	1.3
Net income attributable to Trimble Inc.	94.6					94.6
Net gain attributable to noncontrolling interests	0.0
Net income	94.6
Other Comprehensive Income	2.1				2.1	2.1
Comprehensive Income attributable to Parent	96.7
Comprehensive income	96.7
Issuance of common stock under employee plans, net of tax withholdings, Shares		0.7
Issuance of common stock under employee plans, net of tax withholdings, Value			1.7
Adjustments Related to Tax Withholding for Share-based Compensation	11.8			13.5		11.8
Stock Repurchases, Shares		(0.4)
Stock Repurchases, Value	(19.0)		(2.9)	(16.1)		(19.0)
Stock-based Compensation	16.4		16.4			16.4
Total stockholders' equity at Jun. 28, 2019	$ 2,825.3	$ 0.3	$ 1,649.7	$ 1,354.4	$ (180.4)	$ 2,824.0	$ 1.3
Common stock, shares outstanding	251.8	251.8