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Acquisitions and Dispositions of Businesses (Dispositions and Other) (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended
	Feb. 25, 2025	Dec. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense			$ 82,277	$ 19,328
Mandatorily redeemable noncontrolling interest		$ 159,548	12,349
Mandatorily redeemable noncontrolling interest, Current		0	8,371
GHC One [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mandatory redemption settlement amount	$ 205,000
Mandatorily redeemable noncontrolling interest, Current			8,400
Remaining GHC One and GHC Two [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mandatorily redeemable noncontrolling interest			20,700
CSI Pharmacy Holding Company, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, decrease from redemptions or purchase of interests		2,000
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] \| BridgeU Limited [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets held for sale			1,700
Noncurrent assets held for sale			2,800
Current liabilities held for sale			600
Noncurrent liabilities held for sale			$ 2,200
Securities Subject to Mandatory Redemption [Member] \| GHC One [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense	66,200
Cash paid to settle a significant portion of the mandatorily redeemable noncontrolling interest [Member] \| GHC One [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mandatory redemption settlement amount	186,250
GHC Class B Common Stock issued [Member] \| GHC One [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mandatory redemption settlement amount	$ 18,750
Cash paid for CSI minority shares [Member] \| CSI Pharmacy Holding Company, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, decrease from redemptions or purchase of interests		600
Promissory Note for CSI minority shares due 2026 [Member] \| CSI Pharmacy Holding Company, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncontrolling interest, decrease from redemptions or purchase of interests		$ 1,400
Interest rate		5.50%
Graham Holdings Company [Member] \| CSI Pharmacy Holding Company, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage by parent			87.50%