Business	12 Months Ended
Business	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	Business Description of Business Datto Holding Corp. ("Datto Holding") through its operating subsidiaries, provides cloud-based software and technology solutions purpose-built for delivery through the managed service provider ("MSP") channel to small and medium-sized businesses (“SMB”). Unless the context otherwise indicates or requires, references to "Datto", “we,” “us,” “our” and “the Company” shall refer to Datto Holding and its wholly-owned subsidiaries as a combined entity. The Company’s platform enables its MSP partners to serve the SMB information technology market and includes mission critical cloud-based software and technologies that MSPs sell to SMBs, business management software to help MSPs scale their own businesses, and marketing tools, content, training and industry-leading events that cultivate an empowered and highly engaged MSP partner community. The Company typically has no contractual relationship with the SMBs and considers its MSP partners to be the customers. By selling through this MSP channel, the Company is able to cost-effectively scale the reach of the Company’s solutions and support the global requirements of SMBs without a direct-to-SMB sales and support model. Datto Holding owns 100% of Merritt Holdco, Inc. (“Merritt Holdco”), which owns 100% of Datto, Inc., the Company’s primary operating company. Datto Holding has no operations or significant assets or liabilities other than its investment in Merritt Holdco. Accordingly, Datto Holding is dependent upon distributions from Merritt Holdco to fund any activity, including the payment of dividends. All obligations under Datto’s 2020 Credit Agreement are guaranteed by Merritt Holdco. Initial Public Offering On October 23, 2020, the Company completed an initial public offering (“IPO”) of its common stock. As part of the IPO, the Company issued and sold 22,000,000 shares of its common stock at a public offering price of $27.00 per share. The Company received proceeds of approximately $558.0 million from the IPO, after deducting the underwriting discount. In addition, on November 3, 2020, the underwriters exercised their option in full to purchase 3,300,000 additional shares of common stock at a price of $27.00 per share, resulting in proceeds of approximately $83.6 million, after deducting the underwriting discount. The Company utilized the IPO proceeds to repay the outstanding principal balances under the 2019 Credit Agreement of $590.2 million, $5.3 million of IPO offering costs, and $1.2 million in debt issuance costs for the 2020 Credit Agreement, as defined in Note 11. Debt. Upon entering the 2020 Credit Agreement, the 2019 Credit Agreement was terminated, and the Company wrote-off approximately $8.5 million of unamortized debt issuance costs and original issue discount related to the 2019 Credit Agreement. As of December 31, 2020 Funds controlled by Vista Equity Partners ("Vista") owned approximately 70.6% of the Company’s outstanding common stock, excluding treasury shares. As a result, the Company is a “controlled company” under New York Stock Exchange ("NYSE") corporate governance rules. Emerging Growth Company Status The Company is an emerging growth company ("EGC"), as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”). Under the JOBS Act, EGCs can delay adopting new or revised accounting standards issued subsequent to the enactment of the JOBS Act, until such time as those standards apply to private companies. The Company has elected to use this extended transition period for complying with new or revised accounting standards that have different effective dates for public and private companies until the earlier of the date that the Company (i) is no longer an EGC or (ii) affirmatively and irrevocably opts out of the extended transition period provided in the JOBS Act. As a result, the Company’s consolidated financial statements may not be comparable to the financial statements of issuers who are required to comply with the effective dates for new or revised accounting standards based on public company effective dates. The Company will remain an EGC until the earliest of (i) the last day of the first fiscal year (a) following the fifth anniversary of the completion of the IPO, (b) in which the Company’s total annual gross revenue is at least $1.07 billion or (c) when the Company is deemed to be a large accelerated filer, which means the market value of the Company’s common stock that is held by non-affiliates exceeds $700.0 million as of June 30th of that fiscal year and (ii) the date on which the Company has issued more than $1.0 billion in non-convertible debt securities during the prior three-year period.