Revisions to Previously Reported Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2016	Jul. 03, 2015	Jul. 01, 2016	Jul. 03, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 35.6	$ 25.8	$ 55.3	$ 59.8
Foreign currency translation adjustments	(21.1)	15.1	7.1	(55.2)
Net unrealized actuarial gain	0.1	(0.1)	0.0	0.0
Comprehensive Income (Loss)	14.6	40.8	62.4	4.6
Less: Comprehensive loss attributable to noncontrolling interests	(0.1)	(0.1)	(0.2)	(0.2)
Comprehensive Income (Loss) attributable to Trimble Navigation Ltd.	$ 14.7	40.9	$ 62.6	4.8
Scenario, Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income		25.8		59.8
Foreign currency translation adjustments		19.7		(47.5)
Net unrealized actuarial gain		(0.1)		0.0
Comprehensive Income (Loss)		45.4		12.3
Less: Comprehensive loss attributable to noncontrolling interests		(0.1)		(0.2)
Comprehensive Income (Loss) attributable to Trimble Navigation Ltd.		45.5		12.5
Scenario, Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income		0.0		0.0
Foreign currency translation adjustments		(4.6)		(7.7)
Net unrealized actuarial gain		0.0		0.0
Comprehensive Income (Loss)		(4.6)		(7.7)
Less: Comprehensive loss attributable to noncontrolling interests		0.0		0.0
Comprehensive Income (Loss) attributable to Trimble Navigation Ltd.		$ (4.6)		$ (7.7)