Document and Entity Information [Abstract] Entities [Table] Legal Entity [Axis] Entity [Domain] Represents the Retirement Plan number EBP 001. E B P 001 [Member] TopBuild Corp. 401(k) Plan Entity Information [Line Items] Document Type Document Period End Date Entity Registrant Name Entity Tax Identification Number Entity tax identification number Entity Central Index Key Amendment Flag STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS EBP, Asset [Abstract] ASSETS EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Investments, at fair value EBP, Receivable [Abstract] Receivables: EBP, Note Receivable from Participant Participant notes receivable EBP, Employer Contribution, Receivable Employer contributions EBP, Receivable Total receivables EBP, Asset Total assets EBP, Liability [Abstract] LIABILITIES EBP, Excess Contribution Payable Excess contributions payable EBP, Net Asset Available for Benefit End of year Beginning of year Net assets available for plan benefits per the financial statements Net assets available for benefits STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] STATEMENT OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS EBP, Change in Net Asset Available for Benefit, Increase from Contribution [Abstract] Contributions: EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Participant rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Contributions per the financial statements Total contributions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment income, net: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Unrealized Gain (Loss) on Investment Net appreciation in fair value of investments EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Investment Income (Loss), after Investment Expense Investment income, net n/a E B P, Change in Net Asset Available for Benefit, Increase from Other Income [Abstract] Other income: EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Amount of increase in net asset available for benefit from other income. E B P, Change in Net Asset Available for Benefit, Increase from Other Income Other income Amount credited to other income Amount of increase in net asset available for benefit from total other income including the interest on notes receivables from participants. E B P, Change in Net Asset Available for Benefit, Increase from Total Other Income Including Interest Income On Notes Receivable From Participants Total other income EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] Deductions: EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefit payments Amount of decrease in net asset available for benefit from administrative and other expenses incurred by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). E B P, Change in Net Asset Available for Benefit, Decrease from Administrative And Other Expenses Administrative and other expenses EBP, Change in Net Asset Available for Benefit, Decrease Total deductions EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Net increase in net assets EBP, Net Asset Available for Benefit [Abstract] Net assets available for benefits: DESCRIPTION OF THE PLAN EBP, Description of Plan [Table] EBP, Description of Plan [Line Items] DESCRIPTION OF THE PLAN PLAN TERMINATION EBP, Description of Plan [Text Block] DESCRIPTION OF THE PLAN SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Accounting Policy [Table] EBP, Accounting Policy [Line Items] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES EBP, Summary of Accounting Policy [Text Block] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES FAIR VALUE MEASUREMENT EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Line Items] FAIR VALUE MEASUREMENT EBP, Investment, Fair Value and NAV [Text Block] FAIR VALUE MEASUREMENT INCOME TAX STATUS EBP, Tax Status [Table] EBP, Tax Status [Line Items] INCOME TAX STATUS EBP, Tax Status [Text Block] INCOME TAX STATUS No definition available. PLAN TERMINATION EBP, Plan Termination [Text Block] PLAN TERMINATION RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Line Items] RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS EBP, Related Party and Party-in-Interest Transactions [Text Block] RELATED PARTY AND PARTY IN INTEREST TRANSACTIONS Reconciliation of Financial Statements to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] RECONCILIATION OF FINANCIAL STATEMENTS TO FORM 5500 SUBSEQUENT EVENTS EBP, Subsequent Event [Table] EBP, Subsequent Event [Line Items] SUBSEQUENT EVENTS EBP, Subsequent Event [Text Block] SUBSEQUENT EVENTS SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Line Items] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Schedule of Asset Held for Investment [Text Block] SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) EBP, Basis of Accounting [Policy Text Block] Basis of Accounting. EBP, Use of Estimate [Policy Text Block] Use of Estimates and Assumptions in the Preparation of Financial Statements. EBP, Risk and Uncertainty [Policy Text Block] Risks and Uncertainties. Disclosure of accounting policy for income recognition and investment valuation held by employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Investment Valuation and Income Recognition [Policy Text Block] Investment Valuation and Income Recognition. EBP, Investment [Policy Text Block] Fair Value Measurement. EBP, Contribution [Policy Text Block] Contributions. EBP, Excess Contribution Payable [Policy Text Block] Excess Contributions Payable. EBP, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants. EBP, Payment to Participant [Policy Text Block] Payment of Benefits. EBP, Expense [Policy Text Block] Expenses. EBP, Investment, Fair Value and NAV [Table Text Block] Schedule of Plan's invested assets measured at fair value and the Plan's invested assets measured at NAV Tabular disclosure of redemption details of the collective trus funds. E B P, Investment, Collective Trust Fund Redemption Details [Table Text Block] Schedule of redemption details of the collective trust funds EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] Reconciliation of net assets available for benefits per the financial statements Statistical Measurement [Axis] Statistical Measurement [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Debt Instrument [Axis] Debt Instrument, Name [Domain] Represent information pertaining to Principal residence loan. Principal Residence Loan [Member] Principal residence loan EBP, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Maximum employees contribution (in %) EBP, Participant Contribution, Automatic, Deferral Rate Deferral rate Represents the minimum age criteria for plan eligibility under (employee benefit plan (EBP)). Employee Benefit Plan, Minimum Age For Plan Eligibility Minimum age for Plan eligibility Represents the minimum increment percentage in which participants may direct contributions among investment options under the employee benefit plan (e.g., 1% increments). Employee Benefit Plan, Contribution Election Increment Percentage Employee contribution election increment percentage (in %) Represents the number of years required for participants to become fully vested in employer contributions under a cliff vesting schedule for those employees who started on or after April 1, 2016. Employee Benefit Plan, Cliff Vesting Period Employer contribution cliff vesting period (in years) Represents the percentage of vesting. Employee Benefit Plan, Vesting Percentage Vesting percentage (in %) EBP, Forfeited Nonvested Account Accumulated forfeitures amount EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Forfeited nonvested accounts to reduce company contributions EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Note receivable, minimum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Note receivable, maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Note receivable, maximum borrowing percentage (in %) Term of participant loan of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)). Employee Benefit Plan, Note Receivable From Participant, Term Loan term Represents the maximum number of years over which participants may elect to receive benefit payments in installment form under the employee benefit plan after separation from service due to termination, death, disability, or retirement. Employee Benefit Plan, Benefit Payment Installment Maximum Period Benefit payment installment maximum period (in years) Amount of accumulated revenue credit account of the plan participants. Accumulated Participants Revenue Credit Account Accumulated revenue credit account EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Amount credited to dividend EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Amount used to pay plan expenses Investment Type [Axis] Investments [Domain] Mutual Fund [Member] Mutual funds EBP, Self-Directed Brokerage Account [Member] Brokerage accounts Common Collective Trust [Member] Collective trust funds EBP, Employer, Common Stock Fund [Member] TopBuild Stock Fund Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 Fair Value Measured at Net Asset Value Per Share [Member] Measured at NAV Represents the information pertaining to investments in FID FRDM Target Date Funds and Core Commingled Pool. FID FRDM Target Date Funds and Core Commingled Pool [Member] FID FRDM Target Date Funds and Core Commingled Pool Represents the information pertaining to investments in Managed Income Portfolio - Class 2. Managed Income Portfolio, Class 2 [Member] Managed Income Portfolio - Class 2 EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Domain] Represents the information pertaining to participants. E B P, Participants [Member] Participants Represents the information pertaining to sponsor. E B P, Sponsor [Member] Sponsor EBP, Fair Value, Investment, NAV, Unfunded Commitment Unfunded Commitments EBP, Fair Value, Investment, NAV, Redemption, Notice Period Redemption Notice Period EBP, Tax Determination Letter, Obtained [true false] Determination letter obtained EBP, Tax Determination Letter, Date Determination letter date EBP, Tax Qualification Status [Extensible Enumeration] Tax qualification status Common Stock [Member] Common stock Represents the information pertaining to cash and money market investments. Cash And Money Market Investments [Member] Cash and money market investments EBP, Trustee [Member] Fidelity Amount of cash outflow for payment of the Plan fees. Employee Benefit Plan, Payment Of The Plan Fees Fees paid EBP, Form 5500 Caption, Net Assets [Abstract] Reconciliation of net assets available for benefits Amount of contribution not yet received from employer to the plan to reconcile net asset available for benefit per financial statement to Form 5500 caption. Employee Benefit Plans, Reconciliation To Form 5500, Net Asset Available For Benefit, Employer Contribution Less receivables: Employer contributions Amount of excess contributions payable to the plan to reconcile net asset available for benefit per financial statement to Form 5500 caption. Employee Benefit Plans, Reconciliation To Form 5500, Net Asset Available For Benefit, Excess Contributions Payable Plus payables and transfers: Excess contributions payable EBP, Form 5500 Caption, Net Assets Net assets available for plan benefits per Form 5500 EBP, Form 5500 Caption [Abstract] Reconciliation of certain contributions per the financial statements Amount of increase from contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) in prior period. Employee Benefit Plan, Reconciliation To Form 5500, Prior Period, Increase From Employer Contribution Receivable Plus 2024 employer contributions receivable Amount of decrease from excess contribution payable to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) in prior period. Employee Benefit Plan, Reconciliation To Form 5500, Prior Period, Decrease From Excess Contribution Payable Less 2024 excess contributions payable Amount of increase (decrease) from contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) in prior period. Employee Benefit Plan, Reconciliation To Form 5500, Prior Period, Increase (Decrease) From Contribution Net contributions prior period Amount of decrease in employer's contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) in current period to reconcile change in net asset available for benefit from contributions as per financial statement to Form 5500 caption. Employee Benefit Plan, Reconciliation To Form 5500, Current Period, Decrease From Employer Contribution Less 2025 employer contributions receivable Amount of increase in excess contribution payable to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) in current period to reconcile change in net asset available for benefit from contributions as per financial statement to Form 5500 caption. Employee Benefit Plan, Reconciliation To Form 5500, Current Period, Increase From Excess Contribution Payable Plus 2025 excess contributions payable Amount of increase (decrease) from contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) in current period to reconcile change in net asset available for benefit from contributions as per financial statement to Form 5500 caption. Employee Benefit Plan, Reconciliation To Form 5500, Current Period, Increase (Decrease) From Contribution Net contributions current period EBP, Form 5500 Caption, Total Contributions Contributions per Form 5500 Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent event Per-share cash amount to be received by shareholders of the acquiree company per the merger agreement. Employee Benefit Plan, Merger Agreement, Cash Consideration Per Share Merger Agreement, cash consideration per share Per-share number of shares of acquirer common stock to be issued to shareholders of the acquiree company per the merger agreement. Employee Benefit Plan, Merger Agreement, Stock Consideration Per Share Merger Agreement, stock consideration per share Investment, Identifier [Axis] EBP, Plan Number Plan number EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Current Value EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Notes receivable from participants EBP, Asset Held for Investment, Participant Loan, Interest Rate Interest rates of notes receivable from participants EBP, Investment, Excluding Plan Interest in Master Trust, Cost Cost EBP, Asset Held for Investment Total Investments and Loans EBP, Asset Held for Investment, Party-in-Interest [true false] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration]