{"cik":"0002021880","entityName":"HMH Holding Inc","facts":{"us-gaap":{"AccountsReceivableNetCurrent":{"label":"Accounts Receivable, after Allowance for Credit Loss, Current","description":"Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.","units":{"USD":[{"end":"2025-12-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"Assets":{"label":"Assets","description":"Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.","units":{"USD":[{"end":"2025-12-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"CommonStockParOrStatedValuePerShare":{"label":"Common Stock, Par or Stated Value Per Share","description":"Face amount or stated value per share of common stock.","units":{"USD/shares":[{"end":"2024-04-29","val":0.01,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2024Q1I"},{"end":"2025-12-31","val":0.01,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":0.01,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"CommonStockSharesAuthorized":{"label":"Common Stock, Shares Authorized","description":"The maximum number of common shares permitted to be issued by an entity's charter and bylaws.","units":{"shares":[{"end":"2024-04-29","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2024Q1I"},{"end":"2025-12-31","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"CommonStockSharesIssued":{"label":"Common Stock, Shares, Issued","description":"Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.","units":{"shares":[{"end":"2025-12-31","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"CommonStockSharesOutstanding":{"label":"Common Stock, Shares, Outstanding","description":"Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.","units":{"shares":[{"end":"2025-12-31","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":1000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"CommonStockValue":{"label":"Common Stock, Value, Issued","description":"Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.","units":{"USD":[{"end":"2025-12-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"EarningsPerShareBasic":{"label":"Earnings Per Share, Basic","description":"The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.","units":{"USD/shares":[{"start":"2025-01-01","end":"2025-03-31","val":30560,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q1"},{"start":"2026-01-01","end":"2026-03-31","val":17240,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1"}]}},"EarningsPerShareDiluted":{"label":"Earnings Per Share, Diluted","description":"The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.","units":{"USD/shares":[{"start":"2025-01-01","end":"2025-03-31","val":30560,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q1"},{"start":"2026-01-01","end":"2026-03-31","val":17240,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1"}]}},"InventoryValuationReserves":{"label":"Inventory Valuation Reserves","description":"Amount of valuation reserve for inventory.","units":{"USD":[{"end":"2025-12-31","val":99900000,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"}]}},"StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest":{"label":"Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest","description":"Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.","units":{"USD":[{"end":"2025-12-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q4I"},{"end":"2026-03-31","val":10,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1I"}]}},"WeightedAverageNumberOfDilutedSharesOutstanding":{"label":"Weighted Average Number of Shares Outstanding, Diluted","description":"The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.","units":{"shares":[{"start":"2025-01-01","end":"2025-03-31","val":200,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q1"},{"start":"2026-01-01","end":"2026-03-31","val":200,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1"}]}},"WeightedAverageNumberOfSharesOutstandingBasic":{"label":"Weighted Average Number of Shares Outstanding, Basic","description":"Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.","units":{"shares":[{"start":"2025-01-01","end":"2025-03-31","val":200,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2025Q1"},{"start":"2026-01-01","end":"2026-03-31","val":200,"accn":"0001628280-26-031295","fy":2026,"fp":"Q1","form":"10-Q","filed":"2026-05-06","frame":"CY2026Q1"}]}}}}}