{"cik":2021880,"taxonomy":"us-gaap","tag":"InventoryNet","label":"Inventory, Net","description":"Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.","entityName":"HMH Holding Inc","units":{"USD":[{"end":"2025-12-31","val":253759000,"accn":"0001628280-26-053385","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2025Q4I"},{"end":"2026-06-30","val":252192000,"accn":"0001628280-26-053385","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2026Q2I"}]}}