{"cik":2021880,"taxonomy":"us-gaap","tag":"OtherLiabilitiesNoncurrent","label":"Other Liabilities, Noncurrent","description":"Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.","entityName":"HMH Holding Inc","units":{"USD":[{"end":"2025-12-31","val":54323000,"accn":"0001628280-26-053385","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2025Q4I"},{"end":"2026-06-30","val":61017000,"accn":"0001628280-26-053385","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2026Q2I"}]}}