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Revenue - Summary of Revenue from Products and Services (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)
Revenue [abstract]
Rendering of services	₨ 524,543		₨ 522,061	₨ 481,369
Sales of products	20,328		28,341	31,071
Total revenues	₨ 544,871	$ 8,368	₨ 550,402	₨ 512,440

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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