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Revenue - Summary of Revenue from Products and Services (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2020 INR (₨)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 INR (₨)	Mar. 31, 2018 INR (₨)
Revenue [abstract]
Rendering of services	₨ 598,550		₨ 571,301	₨ 524,543
Sales of products	11,682		14,544	20,328
Total revenues	₨ 610,232	$ 8,094	₨ 585,845	₨ 544,871

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- Definition

Expiry date 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants. Effective 2020-01-01: The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.

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The amount of revenue arising from the rendering of services. [Refer: Revenue]

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