Name:	ghc_AmountofCashExchangedtoBerkshire
Namespace Prefix:	ghc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	ghc_ExchangeAndOtherLineItems
Namespace Prefix:	ghc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Number Berkshire shares exchanged held by Graham Holdings Company and an amount of cash in exchange for Graham Holdings Company common stock held by Berkshire Hathaway.

No definition available.

Name:	ghc_NumberofBerkshireSharesExchanged
Namespace Prefix:	ghc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Number of Graham Holdings shares received from Berkshire Hathaway in exchange for WPLG, a number of Berkshire shares held by the Company and an amount of cash.

No definition available.

Name:	ghc_NumberofGHCSharesReceivedinBerkshireHathawayAgreement
Namespace Prefix:	ghc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The percentage of total Celtic revenue that is now part of the joint venture.

No definition available.

Name:	ghc_PercentageofCelticRevenue
Namespace Prefix:	ghc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571