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Net Pension Cost (Detail) - Pension ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2017 INR (₨)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 INR (₨)	Mar. 31, 2015 INR (₨)
Defined Benefit Plan Disclosure [Line Items]
Service cost	₨ 12.9	$ 0.2	₨ 9.9	₨ 10.2
Interest cost	53.4	0.8	44.9	43.7
Expected return on plan assets	(26.1)	(0.4)	(32.1)	(36.0)
Actuarial (gains)/losses	17.7	0.3	155.1	34.8
Net pension cost	₨ 57.9	$ 0.9	₨ 177.8	₨ 52.7

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

+ References

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-Section 50
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Amount of cost recognized for passage of time related to defined benefit plan.

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-Name Accounting Standards Codification
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-SubTopic 20
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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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