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
APIC, Share-based Payment Arrangement, Recognition and Exercise				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.	196.3
Net gain attributable to noncontrolling interests	0.2
Net income	196.5
Comprehensive Income attributable to Parent	173.8
Comprehensive income	174.0
Total stockholders' equity at Sep. 28, 2018	2,648.6	$ 0.3	1,574.8	1,227.2	(153.9)	2,648.4	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
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(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
Net income attributable to Trimble Inc.	73.7					73.7
Net gain attributable to noncontrolling interests	0.0
Net income	73.7
Other Comprehensive Income	7.3				7.3	7.3
Comprehensive Income attributable to Parent	81.0
Comprehensive income	81.0
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	30.8	$ 0.1	31.2			30.8
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation				(0.5)
Stock Repurchases, Shares		0.0
Stock Repurchases, Value	0.0		0.0	0.0		0.0
Stock-based Compensation	19.2		19.2			19.2
Total stockholders' equity at Sep. 28, 2018	$ 2,648.6	$ 0.3	1,574.8	1,227.2	(153.9)	2,648.4	0.2
Common stock, shares outstanding		251.1
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
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation				(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.	235.0
Net gain attributable to noncontrolling interests	0.1
Net income	235.1
Comprehensive Income attributable to Parent	213.8
Comprehensive income	213.9
Stock Repurchases, Value				(149.1)
Total stockholders' equity at Sep. 27, 2019	2,788.1	$ 0.2	1,661.6	1,332.3	(207.3)	2,786.8	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
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	(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
Net income attributable to Trimble Inc.	78.1					78.1
Net gain attributable to noncontrolling interests	0.0
Net income	78.1
Other Comprehensive Income	(26.9)				(26.9)	(26.9)
Comprehensive Income attributable to Parent	51.2
Comprehensive income	51.2
Issuance of common stock under employee plans, net of tax withholdings, Shares		0.6
Issuance of common stock under employee plans, net of tax withholdings, Value	14.8		15.5			14.8
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation				(0.7)
Stock Repurchases, Shares		(3.3)
Stock Repurchased During Period, Value		$ (0.1)
Stock Repurchases, Value	(120.8)		(21.2)	(99.5)		(120.8)
Stock-based Compensation	17.6		17.6			17.6
Total stockholders' equity at Sep. 27, 2019	$ 2,788.1	$ 0.2	$ 1,661.6	$ 1,332.3	$ (207.3)	$ 2,786.8	$ 1.3
Common stock, shares outstanding	249.1	249.1