Document And Entity Information (USD $)
In Billions, except Share data, unless otherwise specified
12 Months Ended
Jan. 02, 2015
Feb. 20, 2015
Jul. 04, 2014
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 02, 2015    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2014    
Entity Registrant Name TRIMBLE NAVIGATION LTD /CA/    
Entity Central Index Key 0000864749    
Current Fiscal Year End Date --01-02    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   259,176,857  
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 9.1
Entity Current Reporting Status Yes    
Entity Voluntary Filers No