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Employee Benefits - Summary of Defined Benefit Plans (Detail) - INR (₨) ₨ in Millions	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]
Defined benefit obligation at the beginning of the year	₨ (147)
Present value of unfunded obligation				₨ (1,042)	₨ (147)
Recognized asset/(liability)	(147)	₨ (147)		(1,042)	(147)
Re-measurement of net defined benefit liability/(asset)
Return on plan assets excluding interest income	(607)	(501)	₨ (692)
Defined benefit obligation at the end of the year	(1,042)	(147)
Plan assets [member]
Disclosure of net defined benefit liability (asset) [line items]
Defined benefit obligation at the beginning of the year	8,507	7,919
Acquisitions (Note 32)	109	28
Recognized asset/(liability)	8,507	7,919	7,919	₨ 9,443	₨ 8,507
Expected return on plan assets	558	483
Employer contributions	254	59
Benefits paid	(34)
Re-measurement of net defined benefit liability/(asset)
Return on plan assets excluding interest income	49	18
Defined benefit obligation at the end of the year	₨ 9,443	₨ 8,507	₨ 7,919

X

- Definition

The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from business combinations and disposals. [Refer: Business combinations [member]; Net defined benefit liability (asset)]

+ References

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-Name IAS
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]; Interest expense (income), net defined benefit liability (asset)]

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Defined benefit unfunded obligation at present value.

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Expected return on plan assets net defined benefit liability asset.

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