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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+ Details

Segment Information - Summary of Revenues from Geographic Segments Based on Domicile of Customer (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)
Disclosure of geographical areas [line items]
Total	₨ 544,871	$ 8,368	₨ 550,402	₨ 512,440
Operating Segments [member]
Disclosure of geographical areas [line items]
Total	546,359		554,179	516,307
Operating Segments [member] \| India [member]
Disclosure of geographical areas [line items]
Total	43,099		46,555	51,371
Operating Segments [member] \| Americas [member]
Disclosure of geographical areas [line items]
Total	283,515		290,719	258,615
Operating Segments [member] \| Europe [member]
Disclosure of geographical areas [line items]
Total	138,597		133,909	126,417
Operating Segments [member] \| Rest of the World [member]
Disclosure of geographical areas [line items]
Total	₨ 81,148		₨ 82,996	₨ 79,904