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Employee Benefits - Summary of Employee Costs (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Disclosure of defined benefit plans [abstract]
Salaries and bonus	₨ 289,005	₨ 261,981	₨ 258,207
Employee benefits plans
Gratuity and other defined benefit plans	1,459	1,532	1,095
Defined contribution plans	7,372	7,363	7,037
Share based compensation	1,938	1,347	1,742
Total employee cost	₨ 299,774	₨ 272,223	₨ 268,081

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The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment.

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The amount of expense from share-based payment transactions with employees.

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The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]]

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The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

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A class of employee benefits expense that represents wages and salaries. [Refer: Employee benefits expense]

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