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Statement of Changes in Net Asset Available for Benefit (Statement) - EBP025 [Member]
12 Months Ended
Dec. 31, 2025
USD ($)
Additions to net assets:  
Plan interest in investment income of the Graham Holdings Company Master Trust $ 12,491,628
Contributions  
Participant 3,873,216
Employer 52,374
Rollovers 250,187
Total contributions 4,175,777
Interest income - notes receivable 73,130
Total additions 16,740,535
Deductions from net assets:  
Benefits paid to participants (7,110,123)
Administrative expenses (128,294)
Total deductions (7,238,417)
Net increase 9,502,118
Transfers (to) from affiliated plans  
Net transfers from other affiliated plans 606,789
Net asset available for benefits, beginning of year 76,612,299
Net asset available for benefits, end of year 86,721,206
Kaplan Tax Deferred Savings Plan [Member]  
Transfers (to) from affiliated plans  
Transfers from affiliated plans 1,813,308
Transfers to affiliated plans (1,187,240)
Savings Plan for Graham Holdings Company [Member]  
Transfers (to) from affiliated plans  
Transfers to affiliated plans $ (19,279)