v3.7.0.1

Product Warranties (Narrative) (Detail)	6 Months Ended
	Jun. 30, 2017
Minimum
Product Warranty Liability [Line Items]
Warranty periods for products sold, in months and years	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty periods for products sold, in months and years	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: