{"cik":2021880,"taxonomy":"us-gaap","tag":"ContractWithCustomerLiabilityCurrent","label":"Contract with Customer, Liability, Current","description":"Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.","entityName":"HMH Holding Inc","units":{"USD":[{"end":"2025-12-31","val":35249000,"accn":"0001628280-26-053385","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2025Q4I"},{"end":"2026-06-30","val":42780000,"accn":"0001628280-26-053385","fy":2026,"fp":"Q2","form":"10-Q","filed":"2026-08-05","frame":"CY2026Q2I"}]}}