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Debt, Commitments And Contingencies (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended 12 Months Ended
Nov. 24, 2014
Oct. 30, 2014
Apr. 03, 2015
Jan. 02, 2015
Nov. 24, 2014
Debt Instrument [Line Items]          
Total debt     663.4us-gaap_LongTermDebt $ 738.4us-gaap_LongTermDebt  
Non-current portion of long-term debt     530.3us-gaap_LongTermDebtNoncurrent 674.0us-gaap_LongTermDebtNoncurrent  
Term Loan Repayments of Principal in Year Two     0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo    
Term Loan Repayments of Principal in Year Three     0.1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree    
Term Loan Repayments of Principal in Year Four     0us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour    
Ratio of total indebtedness to EBITDA     The 2012 Credit Facility contains various customary representations and warranties by the Company, which include customary use of materiality, material adverse effect and knowledge qualifiers. The 2012 Credit Facility also contains customary affirmative and negative covenants including, among other requirements, negative covenants that restrict the Company's ability to dispose of assets, create liens, incur indebtedness, repurchase stock, pay dividends, make acquisitions and make investments. Further, the 2012 Credit Facility contains financial covenants that require the maintenance of minimum interest coverage and maximum leverage ratios. Specifically, the Company must maintain as of the end of each fiscal quarter a ratio of (a) EBITDA (as defined in the 2012 Credit Facility) to (b) interest expenses for the most recently ended period of four fiscal quarters of not less than 3.00 to 1. The Company must also maintain, at the end of each fiscal quarter, a ratio of (x) total indebtedness to (y) EBITDA (as defined in the 2012 Credit Facility) for the most recently ended period of four fiscal quarters of not greater than 3 to 1; provided, that on the completion of a material acquisition, the Company may increase the ratio by 0.25 for the fiscal quarter during which such acquisition occurred and each of the three subsequent fiscal quarters.    
Restrictive covenants     The Company was in compliance with these covenants at the end of the first quarter of fiscal 2015.    
Unconditional purchase obligations     124.7us-gaap_PurchaseObligation    
2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Covenant Ratio - Maximum Leverage       3.00trmb_CovenantRatioMaximumLeverage
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Covenant Ratio - Minimum Interest Coverage       3.50trmb_CovenantRatioMinimumInterestCoverage
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Debt Related Commitment Fees and Debt Issuance Costs       1.6us-gaap_DebtRelatedCommitmentFeesAndDebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
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Unsecured revolving credit facility, initiation date       Nov. 24, 2014  
Debt Instrument, Term 5 years        
Unsecured revolving credit facility, expiration date     Nov. 24, 2019    
Covenant Ratio Increase upon acquisition       0.50trmb_CovenantRatioIncreaseUponAcquisition
/ us-gaap_DebtInstrumentAxis
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Uncommitted Facilities [Member]          
Debt Instrument [Line Items]          
Short-term Debt     133.0us-gaap_ShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		 57.0us-gaap_ShortTermBorrowings
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		  
Total debt     133.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		 57.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		  
Senior Notes [Member] | Senior Notes 4.75% December 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage     4.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		    
Debt Instrument, Maturity Date     Dec. 01, 2024    
Expense Related to Distribution or Servicing and Underwriting Fees       2.6us-gaap_ExpenseRelatedToDistributionOrServicingAndUnderwritingFees
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Debt Issuance Cost       3.0us-gaap_DebtIssuanceCosts
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Discount on Notes Offering Price, Percentage       0.795%trmb_DiscountonNotesOfferingPricePercentage
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/ us-gaap_LongtermDebtTypeAxis
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Proceeds from Issuance of Debt       396.9us-gaap_ProceedsFromIssuanceOfDebt
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/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		  
Debt Instrument, Face Amount 400.0us-gaap_DebtInstrumentFaceAmount
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= trmb_SeniorNotes4.75December2024Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		       400.0us-gaap_DebtInstrumentFaceAmount
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= trmb_SeniorNotes4.75December2024Member
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= us-gaap_SeniorNotesMember
Debt Instrument, Issuance Date Nov. 24, 2014        
Debt Instrument, Offering Date   Oct. 30, 2014      
Term Loan [Member] | 2012 Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity 700.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= trmb_TwoThousandTwelveCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_TermLoanMember		       700.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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= trmb_TwoThousandTwelveCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_TermLoanMember
Debt Instrument, Term 5 years        
Revolving Credit Facility [Member]          
Debt Instrument [Line Items]          
Total debt     133.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 277.0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		  
Revolving Credit Facility [Member] | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Total debt     133.0us-gaap_LongTermDebt
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= us-gaap_RevolvingCreditFacilityMember		 277.0us-gaap_LongTermDebt
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		  
Long-term Debt, Weighted Average Interest Rate     1.43%us-gaap_LongtermDebtWeightedAverageInterestRate
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		 1.42%us-gaap_LongtermDebtWeightedAverageInterestRate
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember		  
Promissory Notes And Other Debt [Member]          
Debt Instrument [Line Items]          
Total debt     0.4us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= trmb_PromissoryNotesAndOtherMember		 7.6us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= trmb_PromissoryNotesAndOtherMember		  
Non-current portion of long-term debt     0.4us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= trmb_PromissoryNotesAndOtherMember		 0.4us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= trmb_PromissoryNotesAndOtherMember		  
Letter of Credit [Member] | Unsecured Debt [Member] | Maximum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity     50.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Revolving Credit Facility [Member] | 2012 Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity 700.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= trmb_TwoThousandTwelveCreditFacilityMember		       700.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
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= trmb_TwoThousandTwelveCreditFacilityMember
Debt Instrument, Term 5 years        
Revolving Credit Facility [Member] | Minimum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.10%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
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= us-gaap_RevolvingCreditFacilityMember
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Revolving Credit Facility [Member] | Maximum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.30%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Revolving Credit Facility [Member] | Uncommitted Facilities [Member]          
Debt Instrument [Line Items]          
Short-term Debt     133.0us-gaap_ShortTermBorrowings
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		 57.0us-gaap_ShortTermBorrowings
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		  
Number Of Revolving Loan Facilities     2trmb_NumberOfRevolvingLoanFacilities
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		    
Line of Credit Facility, Current Borrowing Capacity     75.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		    
Credit facility interest rate in addition to specific base rates     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		    
Short-term Debt, Weighted Average Interest Rate     1.12%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		 1.15%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilitiesMember		  
Revolving Credit Facility [Member] | Unsecured Debt [Member] | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Current Borrowing Capacity     1,000.0us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
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= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_UnsecuredDebtMember		    
Revolving Credit Facility [Member] | Term Loan [Member] | Maximum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Increase in available revolving credit line     500.0trmb_UnsecuredRevolvingCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
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= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_TermLoanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member]          
Debt Instrument [Line Items]          
Credit Facilities Aggregate Principal Amount     75us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilityTwoMember		    
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member] | Minimum          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     0.90%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilityTwoMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Revolving Credit Facility [Member] | Uncommitted Facility Two [Member] | Maximum          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LongtermDebtTypeAxis
= trmb_UncommittedFacilityTwoMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
Change of Control Period [Member] | Senior Notes 4.75% December 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage     101.00%us-gaap_DebtInstrumentRedemptionPricePercentage
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= trmb_SeniorNotes4.75December2024Member
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= trmb_ChangeofControlPeriodMember		    
Debt Instrument, Redemption, Period Two [Member] | Senior Notes 4.75% December 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
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Debt Instrument, Redemption, Period One [Member] | Maximum | Senior Notes 4.75% December 2024 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Redemption Price, Percentage     100.00%us-gaap_DebtInstrumentRedemptionPricePercentage
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= us-gaap_DebtInstrumentRedemptionPeriodOneMember
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= us-gaap_MaximumMember		    
Reserve Adjusted Fixed Per Annum Rate [Member] | Minimum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     1.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_VariableRateAxis
= trmb_ReserveAdjustedFixedPerAnnumRateMember		    
Reserve Adjusted Fixed Per Annum Rate [Member] | Maximum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     1.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
= trmb_TwoThousandFourteenCreditFacilityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_VariableRateAxis
= trmb_ReserveAdjustedFixedPerAnnumRateMember		    
Reserve Adjusted One Month LIBOR [Member] | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit Facility Incremental Fixed Margin Rate     1.00%trmb_CreditFacilityIncrementalFixedMarginRate
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/ us-gaap_VariableRateAxis
= trmb_ReserveAdjustedOneMonthLIBORMember		    
Reserve Adjusted One Month LIBOR [Member] | Minimum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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/ us-gaap_RangeAxis
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/ us-gaap_VariableRateAxis
= trmb_ReserveAdjustedOneMonthLIBORMember		    
Reserve Adjusted One Month LIBOR [Member] | Maximum | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     0.75%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_VariableRateAxis
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US Treasury Rate [Member] | Debt Instrument, Redemption, Period One [Member] | Maximum          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates       0.40%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Federal Funds Effective Swap Rate [Member] | 2014 Credit Facility [Member]          
Debt Instrument [Line Items]          
Credit facility interest rate in addition to specific base rates     0.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
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Long-term Debt [Member] | Promissory Notes And Other Debt [Member]          
Debt Instrument [Line Items]          
Non-current portion of long-term debt       $ 0.4us-gaap_LongTermDebtNoncurrent
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