Description of Plan (Details) - EBP025 [Member]	12 Months Ended
Dec. 31, 2025 USD ($) loan
Description of Plan [Line Items]
Minimum amount of account balance that may not be deferred and are subject to automotic rollover/cash out	$ 1,000
Maximum amount of account balance that may not be deferred and are subject to automotic rollover/cash out	7,000
Amount of account balance that may not be deferred and may be subject to potential rollover/cash out	$ 7,000
Automatic annual increase increment, Option 1	1.00%
Automatic annual increase increments, Option 2	2.00%
Automatic annual increase increments, Option 3	3.00%
Employer contribution matching percentage	100.00%
Discretionary contribution amount	$ 0
Number of active loans \| loan	1
Maximum percentage of account balance participant may borrow	50.00%
Minimum borrowing amount	$ 1,000
Maximum borrowing amount	$ 50,000
Employer Common Stock Fund [Member]
Description of Plan [Line Items]
Maximum percentage of employee contributions to single investment	20.00%
Berkshire Hathaway Stock Fund [Member]
Description of Plan [Line Items]
Maximum percentage of employee contributions to single investment	25.00%
Maximum percentage of employer contribution to single investment	25.00%
Maximum percentage of total account balance in single investment	25.00%
Certain hourly and part-time employees [Member]
Description of Plan [Line Items]
Employer contribution participant compensation matched percentage	1.00%
Union employee [Member]
Description of Plan [Line Items]
Employer contribution participant compensation matched percentage	3.00%
Non-union employee [Member]
Description of Plan [Line Items]
Employer contribution participant compensation matched percentage	1.00%

Maximum balance of account that may not be deferred and are subject to automatic rollover/automatic cash out.

No definition available.

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Period Type:	duration

- Definition

Minimum balance of account that may not be deferred and are subject to automatic rollover/automatic cash out.

+ References

No definition available.

+ Details

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- Definition

Balance of account that may not be deferred and may be subject to potential rollover/automatic cash out.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage allowed to single investment of total employee contributions.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage allowed to single investment of total employer contributions.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Automative incremental increase of pre-tax deferrals on an annual basis up to the limits established by the Plan.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

Automative incremental increase of pre-tax deferrals on an annual basis up to the limits established by the Plan.

+ References

No definition available.

+ Details

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- Definition

Automative incremental increase of pre-tax deferrals on an annual basis up to the limits established by the Plan.

+ References

No definition available.

+ Details

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- Definition

Maximum percentage allowed of a single investment of total account balance after exchanges in.

+ References

No definition available.

+ Details

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- Definition

Amount of discretionary contributions made by employer for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

No definition available.

+ Details

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Namespace Prefix:	ghc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Number of active loans that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

+ Details

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- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

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- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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- Details

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- Details

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- Details

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