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Acquisitions and Dispositions of Businesses (Dispositions and Other) (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended
	Feb. 25, 2025	Jul. 31, 2025	Dec. 31, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest expense				$ 17,164	$ 25,896	$ 117,547	$ 136,607
Mandatorily redeemable noncontrolling interest, Current			$ 0	8,661		8,661
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests				1,761
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				8,700		8,700
Remaining GHC One and GHC Two [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Mandatory redemption settlement amount				$ 22,200		$ 22,200
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		$ 1,800	2,000
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%		87.50%

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