| Line Item | Mar 31, 2026 | Mar 31, 2025 | Mar 31, 2024 | Mar 31, 2023 | Mar 31, 2022 | Mar 31, 2021 | Mar 31, 2020 | Mar 31, 2019 | Mar 31, 2018 |
|---|---|---|---|---|---|---|---|---|---|
| Analysis of income and expense [abstract] | |||||||||
| Revenues | |||||||||
| Cost of revenues | |||||||||
| Gross profit | |||||||||
| Selling, general and administrative expenses | |||||||||
| Research and development expenses | |||||||||
| Impairment of non-current assets, net | |||||||||
| Other income, net | |||||||||
| Total operating expenses | |||||||||
| Results from operating activities (A) | |||||||||
| Finance income | |||||||||
| Finance expense | |||||||||
| Finance income, net (B) | |||||||||
| Share of profit of equity accounted investees, net of tax (C) | |||||||||
| Profit before tax [(A)+(B)+(C)] | |||||||||
| Tax expense, net | |||||||||
| Profit for the year | |||||||||
| Attributable to: | |||||||||
| Equity holders of the parent company | |||||||||
| Non-controlling interests | |||||||||
| Earnings per share attributable to equity holders of the parent company | |||||||||
| Basic earnings per share of Rs.1/- each | |||||||||
| Diluted earnings per share of Rs.1/- each |