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Material accounting policies (Details 1)
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Computer software [member] | Bottom of range [member]    
Statements [Line Items]    
Amortisation method, intangible assets other than goodwill 1 1
Computer software [member] | Top of range [member]    
Statements [Line Items]    
Amortisation method, intangible assets other than goodwill 3 3
Cable Capacity [member]    
Statements [Line Items]    
Amortisation method, intangible assets other than goodwill 12 12
Other intangible assets [member] | Bottom of range [member]    
Statements [Line Items]    
Amortisation method, intangible assets other than goodwill 3 3
Other intangible assets [member] | Top of range [member]    
Statements [Line Items]    
Amortisation method, intangible assets other than goodwill 5 5