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Earnings Per Share (Details 1) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator:        
Net income attributable to Graham Holdings Company common stockholders $ 122,925 $ 72,503 $ 183,568 $ 175,843
Less: Dividends paid-common stock outstanding and unvested restricted shares (7,852) (7,444) (31,360) (30,370)
Undistributed earnings $ 115,073 $ 65,059 $ 152,208 $ 145,473
Percent allocated to common stockholders 99.39% 99.31% 99.39% 99.31%
Undistributed earnings allocated to common stockholders $ 114,372 $ 64,612 $ 151,280 $ 144,473
Add: Dividends paid-common stock outstanding 7,803 7,392 31,168 30,164
Numerator for basic earnings per share 122,175 72,004 182,448 174,637
Add: Additional undistributed earnings due to dilutive stock options 7 3 8 6
Numerator for diluted earnings per share $ 122,182 $ 72,007 $ 182,456 $ 174,643
Denominator:        
Weighted average shares outstanding (shares) 4,334 4,352 4,329 4,395
Denominator for diluted earnings (loss) per share (shares) 4,378 4,384 4,370 4,423
Graham Holdings Company Common Stockholders:        
Basic earnings per common share (in USD per share) $ 28.19 $ 16.54 $ 42.15 $ 39.74
Diluted earnings per common share (in USD per share) $ 27.91 $ 16.42 $ 41.75 $ 39.49
Stock Options [Member]        
Denominator:        
Add: Effect of dilutive stock options (shares) 44 32 41 28