Summary of Significant Accounting Policies (Narrative) (Details)	1 Months Ended		12 Months Ended
	Nov. 30, 2022 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2022 USD ($) business performanceObligation	Dec. 31, 2021 USD ($)	Dec. 31, 2020	May 31, 2020
Summary of Significant Accounting Policies [Line Items]
Maximum Term of Contract			1 year
Finance Lease, Right-of-Use Asset | $			$ 13,835,000
Finance Lease, Liability, Current | $			8,697,000
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $			$ 1,200,000	$ 3,508,000
Framebridge [Member] | Other Businesses [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Shares Eligible to be Redeemed						20.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage						93.40%
Hoover Treated Wood Products [Member] | Manufacturing [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $		$ 3,500,000
Graham Holdings Company [Member] | Hoover Treated Wood Products [Member] | Manufacturing [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			100.00%		98.01%
GHC One [Member] | Group of Senior Managers of GHG [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Contributed Capital			5.00%
GHC One [Member] | Graham Holdings Company [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Contributed Capital			95.00%
GHC One [Member] | Graham Holdings Company [Member]
Summary of Significant Accounting Policies [Line Items]
Guaranteed Return			8.00%
Percentage of Distributions Available to Common Unit Holders			80.00%
GHC One [Member] | Group of Senior Managers of GHG [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Distributions Available to Common Unit Holders			20.00%
GHC One [Member] | GHC One [Member] | Group of Senior Managers of GHG [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners			5.00%
Automotive [Member]
Summary of Significant Accounting Policies [Line Items]
Finance Lease, Right-of-Use Asset | $			$ 5,400,000	4,000,000
Finance Lease, Liability, Current | $			$ 5,400,000	$ 4,000,000
Weiss [Member] | Graham Holdings Company [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			50.10%
Framebridge [Member] | Graham Holdings Company [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			93.40%
CSI Pharmacy Holding Company, LLC [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests | $	$ 1,200,000
CSI Pharmacy Holding Company, LLC [Member] | Graham Holdings Company [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			76.50%	75.00%
Skin Clique | Graham Holdings Company [Member]
Summary of Significant Accounting Policies [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent			51.00%
Transferred over Time [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Revenue			58.00%	67.00%	73.00%
Kaplan International [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Number of business lines | business			1
number of performance obligations with variable consideration			2
Higher Education [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Transition and Operations Support Agreement Initial Term			30 years
Television Broadcasting [Member] | Advertising Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Revenue Recognition, Maximum Period between Recognition of Revenue and Receipt of Payment			60 days
Television Broadcasting [Member] | Retransmission Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Revenue Recognition, Maximum Period between Recognition of Revenue and Receipt of Payment			60 days
Manufacturing [Member]
Summary of Significant Accounting Policies [Line Items]
Revenue Recognition, Maximum Period between Recognition of Revenue and Receipt of Payment			90 days
Number of business lines | business			4
Manufacturing [Member] | Transferred over Time [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Revenue			21.00%	21.00%	23.00%
Health Care [Member] | Home Health Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Revenue Recognition, Maximum Period between Recognition of Revenue and Receipt of Payment			30 days
Health Care [Member] | Hospice Revenue [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Revenue Recognition, Maximum Period between Recognition of Revenue and Receipt of Payment			60 days
Health Care [Member] | Other Healthcare Services [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Automotive [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Code3 [Member]
Summary of Significant Accounting Policies [Line Items]
Number of Performance Obligations			1
Revenue Recognition, Maximum Period between Recognition of Revenue and Receipt of Payment			100 days
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Amortized Intangible Assets, Useful Life (in years)			15 years
Lessee, Operating Lease, Renewal or Termination Option Term			10 years
Maximum [Member] | Weiss [Member] | Graham Healthcare Group [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Shares Eligible to be Redeemed			10.00%	10.00%
Maximum [Member] | Framebridge [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Shares Eligible to be Redeemed			20.00%
Maximum [Member] | CSI Pharmacy Holding Company, LLC [Member] | Graham Healthcare Group [Member]
Summary of Significant Accounting Policies [Line Items]
Percentage of Shares Eligible to be Redeemed			50.00%
Maximum [Member] | Machinery and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life (in years)			20 years
Maximum [Member] | Building [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life (in years)			50 years
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Lessee, Operating Lease, Renewal or Termination Option Term			1 year
Minimum [Member] | Machinery and Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life (in years)			3 years
Minimum [Member] | Building [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life (in years)			20 years