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v3.8.0.1

Product Warranties (Narrative) (Detail) | 3 Months Ended
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Mar. 30, 2018
Minimum |
Product Warranty Liability [Line Items] |
Warranty Period On Products Sold | 1 year
Maximum |
Product Warranty Liability [Line Items] |
Warranty Period On Products Sold | 2 years

X
- Definition Warranty Period On Products Sold + References No definition available. + Details
Name: | trmb_WarrantyPeriodOnProductsSold
Namespace Prefix: | trmb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |