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Revenue - Summary of Revenue from Products and Services (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)	Mar. 31, 2017 INR (₨)
Revenue [abstract]
Rendering of services	₨ 571,301		₨ 524,543	₨ 522,061
Sales of products	14,544		20,328	28,341
Total revenues	₨ 585,845	$ 8,471	₨ 544,871	₨ 550,402

X

- Definition

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.

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

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The amount of revenue arising from the sale of goods. [Refer: Revenue]

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