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Cost of sales - Disclosure major items of cost of sales (Details) - INR (₨)
₨ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Disclosure Of Cost of Goods Sold And Services Rendered [Abstract]      
Personnel expenses ₨ 2,873,767 ₨ 2,859,329 ₨ 2,407,234
Network Costs 9,031,884 7,869,407 6,837,956
Cost of Hardware / Software 4,418,906 4,326,509 5,134,730
Power Costs 5,592,613 4,623,020 4,283,215
Total Amount Cost Of Sales ₨ 21,917,170 ₨ 19,678,265 ₨ 18,663,135