Employee Benefits - Summary of Change in Present Value of Defined Obligation (Detail) - INR (₨) ₨ in Millions	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Disclosure of net defined benefit liability (asset) [line items]
Defined benefit obligation at the beginning of the year	₨ (351)
Current service cost	1,525	₨ 1,130	₨ 915
Interest on obligation	7	(35)	(30)
Remeasurement loss/(gains)
Actuarial loss/(gain) arising from financial assumptions	296	(363)	(180)
Actuarial loss/(gain) arising from demographic assumptions	54	73	(2)
Defined benefit obligation at the end of the year	(147)	(351)
Present value of defined benefit obligation [member]
Disclosure of net defined benefit liability (asset) [line items]
Defined benefit obligation at the beginning of the year	8,270	6,656
Acquisitions	38	751
Current service cost	1,525	1,130
Interest on obligation	490	464
Benefits paid	(865)	(708)
Remeasurement loss/(gains)
Actuarial loss/(gain) arising from financial assumptions	(296)	363
Actuarial loss/(gain) arising from demographic assumptions	(54)	(73)
Actuarial loss/(gain) arising from experience adjustments	(454)	(313)
Defined benefit obligation at the end of the year	₨ 8,654	₨ 8,270	₨ 6,656

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)]

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

The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)]

+ References

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

The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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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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No definition available.

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- References

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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

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

The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)]

+ References

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

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

Actuarial (gain) losses arising from changes in experience adjustments on plan liabilities net defined benefit liability (asset).

+ References

No definition available.

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