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Material accounting policies (Details 4)
12 Months Ended
Dec. 31, 2025
Customer-related intangible assets [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 6 years
Customer Relationships Other Courses [Member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 4 years 6 months
Computer software [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 5 years
Brand names [member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 2 years
Brand names [member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 30 years
Education Content Developed Technology And Educational Platform [Member] | Bottom of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 3 years
Education Content Developed Technology And Educational Platform [Member] | Top of range [member]  
IfrsStatementLineItems [Line Items]  
Estimated useful lives of intangible assets 5 years