XML 46 R37.htm IDEA: XBRL DOCUMENT
v3.23.1

Organization, Basis of Presentation and Recent Accounting Pronouncements (Organization and Basis of Presentation) (Narrative) (Details) | Mar. 31, 2023 automotiveDealership televisionStation
--- | ---
Television Broadcasting [Member] |
Number of television broadcast stations | televisionStation | 7
Automotive [Member] |
Number of Automotive Dealerships Owned | automotiveDealership | 6

X
- Definition Number of Automotive Dealerships Owned + References No definition available. + Details
Name: | ghc_NumberOfAutomotiveDealershipsOwned
Namespace Prefix: | ghc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of television broadcast stations owned by the Company. + References No definition available. + Details
Name: | ghc_NumberOfTelevisionBroadcastStationsOwned
Namespace Prefix: | ghc_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ghc_TelevisionBroadcastingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ghc_AutomotiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |