Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions		Sep. 26, 2014	Jun. 30, 2017	Dec. 30, 2016	Mar. 18, 2015
Loss Contingencies [Line Items]
Unconditional purchase obligations			$ 186.0
Business Combination, Contingent Consideration, Liability	[1]		$ 21.2	$ 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. The undiscounted maximum payments under the arrangements is $56.9 million at the end of the second quarter of fiscal 2017. The fair values are determined using the expected cash flow approach 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.