Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions		Sep. 24, 2014	Mar. 31, 2017	Dec. 30, 2016	Mar. 18, 2015
Loss Contingencies [Line Items]
Unconditional purchase obligations			$ 166.3
Business Combination, Contingent Consideration, Liability	[1]		$ 10.8	$ 4.5
Pending Litigation [Member] | Recreational Data Services Plaintiff [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Awarded, Value		$ 51.3
Final Judgment In Favor of Company					$ 0.6

[1] Contingent consideration liabilities represent arrangements to pay the former owners of certain companies that Trimble acquired. Contingent consideration liabilities are included in Other current liabilities and Other non-current liabilities on the Company's Condensed Consolidated Balance Sheets. The undiscounted maximum payment under the arrangements is $39.7 million at the end of the first quarter of fiscal 2017, based on estimated future revenues, gross margins or other milestones.