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Litigation (Narrative) (Details) (Harbiner Plaintiffs [Member], USD $)
In Billions, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Harbiner Plaintiffs [Member]
 
Loss Contingencies [Line Items]  
Loss Contingency, Damages Sought, Value $ 1.9us-gaap_LossContingencyDamagesSoughtValue
/ us-gaap_LitigationCaseAxis
= trmb_HarbinerPlaintiffsMember
Loss Contingency, Number of Defendants 4us-gaap_LossContingencyNumberOfDefendants
/ us-gaap_LitigationCaseAxis
= trmb_HarbinerPlaintiffsMember