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Employee benefits (Details 4) - INR (₨)
₨ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Reconciliation of changes in net assets available for benefits [abstract]      
Fair value of plan assets at the beginning of the year ₨ 357,360 ₨ 271,170 ₨ 138,180
Employer contributions 52,884 86,289 157,682
Benefits paid (41,621) (21,767) (25,342)
Remeasurements - return on plan assets excluding amounts included in interest income 4,529 1,511 (8,138)
Fair value of plan assets at the end of the year 398,663 357,360 271,170
Actual return on plan assets 30,040 21,668 650
Interest income ₨ 25,511 ₨ 20,157 ₨ 8,788