Commitments and Contingencies (Narrative) (Details) - USD ($)		Mar. 16, 2018	Dec. 08, 2017	Sep. 26, 2014	Mar. 30, 2018	Dec. 29, 2017	Mar. 18, 2015
Loss Contingencies [Line Items]
Unconditional purchase obligations					$ 215,300,000
Business Combination, Contingent Consideration, Liability	[1]				$ 6,200,000	$ 14,200,000
Pending Litigation [Member] | Recreational Data Services Plaintiff [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value			$ 1	$ 51,300,000
Final Judgment In Favor of Company							$ 600,000
Settled Litigation [Member] | Recreational Data Services Plaintiff [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value		$ 1

[1] Contingent consideration liabilities represent arrangements to pay the former owners of certain companies that Trimble acquired. The undiscounted maximum payment under the arrangements is $53.4 million at the end of the first quarter of fiscal 2018. The fair values are estimated using scenario-based methods or option pricing methods based upon estimated future revenues, gross margins or other milestones. Contingent consideration liabilities are included in Other current liabilities and Other non-current liabilities on the Company's Condensed Consolidated Balance Sheets.