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Summary of Significant Accounting Policies (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
performanceObligation
business
Dec. 31, 2020
USD ($)
Dec. 31, 2019
May 31, 2020
Dec. 01, 2019
Mar. 31, 2019
Summary of Significant Accounting Policies [Line Items]            
Maximum Term of Contract 1 year          
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%    
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%       98.01%
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 | $ $ 4.0 $ 5.9        
Finance Lease, Liability, Current | $ $ 4.0 $ 5.9        
CSI Pharmarcy [Member] | Graham Holdings Company [Member]            
Summary of Significant Accounting Policies [Line Items]            
Noncontrolling Interest, Ownership Percentage by Parent 75.00%          
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%          
Transferred over Time [Member]            
Summary of Significant Accounting Policies [Line Items]            
Percentage of Revenue 67.00% 73.00% 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% 23.00% 28.00%      
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] | CSI Pharmarcy [Member] | Graham Healthcare Group [Member]            
Summary of Significant Accounting Policies [Line Items]            
Percentage of Shares Eligible to be Redeemed         50.00%  
Maximum [Member] | Weiss [Member] | Graham Healthcare Group [Member]            
Summary of Significant Accounting Policies [Line Items]            
Percentage of Shares Eligible to be Redeemed 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