The amount of cash balances held at banks.

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The interest rate on borrowings. [Refer: Borrowings]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The description of concentrations of risks arising from financial instruments. [Refer: Classes of financial instruments [domain]]

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The amount of deposit liabilities from banks held by the entity.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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Decrease in fair value of derivative instruments.

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Decrease in fair Value of derivative instruments other comprehensive income.

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Decrease in fair value of derivative instruments statement of income.

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Decrease In Spot Exchange Rate Of The Indian Rupee With US Dollar

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Description Of Cash Flow Hedge Reserve

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Estimated sensitivity on interest payments basis-point variance.

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Increase decrease in results by change in foreign currencies compared to functional currency.

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Increase/decrease in the respective foreign currencies compared to functional currency.

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Increase in fair value of derivative instruments.

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Increase in fair value of derivative instruments other comprehensive income.

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Increase in fair value of derivative instruments statement of income.

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Increase In Spot Exchange Rate Of The Indian Rupee With US Dollar

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The basis (reference rate) used for calculation of interest rate increase (decrease) on interest rate swaps.

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Market yield on loans.

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Number of major banks.

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Percentage of company total investments .

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Percentage of reasonably possible increase decrease in unobservable inputs contingent consideration and liability.

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Percentage of total cash and cash equivalents.

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Financial Instruments - Additional Information (Detail)	12 Months Ended
Financial Instruments - Additional Information (Detail)	Mar. 31, 2026 INR (₨) Banks	Mar. 31, 2025 INR (₨)	Jun. 23, 2021
Disclosure of detailed information about financial instruments [line items]
Cash flow hedging reserve description	The related hedge transactions for balance in cash flow hedging reserves as at March 31, 2026 are expected to occur and be reclassified to the consolidated statement of income over a period of 12 months.
Interest rate swaps basis points	1.00%
Description of concentration of risk	No single customer accounted for more than 10% of the accounts receivable as at March 31, 2025 and 2026, or revenues for the years ended March 31, 2024, 2025 and 2026.
Increase/decrease in the unobservable inputs	1.00%	1.00%
Number of major banks \| Banks	2
Bank balance with bank in excess of 10% of company's total cash and cash equivalents	₨ 83,236,000,000
Demand deposit with bank in excess of 10% of company's total cash and cash equivalents	₨ 3,546,000,000
Percentage of total cash and cash equivalents	10.00%
Percentage of company total investment	10.00%
Unsecured Notes 2026 [member]
Disclosure of detailed information about financial instruments [line items]
Interest rate	1.50%		1.50%
Market yield on loans	4.48%
Interest rate risk [member] \| Floating Interest Rate [member]
Disclosure of detailed information about financial instruments [line items]
Additional interest expense on floating rate borrowing_interest rate sensitivity	₨ 799,000,000
Currency risk [member]
Disclosure of detailed information about financial instruments [line items]
Increase/decrease in results by change in foreign currencies compared to functional currency	₨ 802,000,000	₨ 789,000,000
Increase/decrease in the respective foreign currencies compared to functional currency	1.00%	1.00%
Increase in spot exchange rate of the Indian rupee with the U.S. dollar	₨ 1
Decrease in spot exchange rate of the Indian rupee with the U.S. dollar	1
Currency risk [member] \| Indian Rupee [member]
Disclosure of detailed information about financial instruments [line items]
Decrease in fair value of foreign currency foreign currency dollar denominated derivative instruments (forward and option contracts)	2,756,000,000
Increase in fair value of foreign currency foreign currency dollar denominated derivative instruments (forward and option contracts)	2,743,000,000
Decrease in fair value of foreign currency foreign currency dollar denominated derivative instruments (forward and option contracts)	683,000,000
Increase in fair value of foreign currency foreign currency dollar denominated derivative instruments (forward and option contracts)	683,000,000
Decrease in fair value of foreign currency foreign currency dollar denominated derivative instruments (forward and option contracts)	2,073,000,000
Increase in fair value of foreign currency foreign currency dollar denominated derivative instruments (forward and option contracts)	₨ 2,060,000,000