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Funded Status of Pension Plan and Amounts Recognized in Bank's Financial Statements (Detail) - Pension ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2018 INR (₨)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)	Mar. 31, 2018 USD ($)
Change in benefit obligations:
Projected benefit obligation ("PBO"), beginning of the period	₨ 722.2	$ 11.1	₨ 696.8
Service cost	7.6	0.1	12.9	₨ 9.9
Interest cost	57.9	0.9	53.4	44.9
Actuarial (gains)/losses	22.6	0.3	25.3
Benefits paid	(87.5)	(1.3)	(66.2)
Projected benefit obligation, end of the period	722.8	11.1	722.2	696.8
Change in plan assets:
Fair value of plan assets, beginning of the period	361.6	5.6	383.8
Expected return on plan assets	23.6	0.4	26.1	32.1
Actuarial gains/(losses)	5.9	0.1	7.6
Actual return on plan assets	29.5	0.5	33.7
Employer contributions	9.4	0.1	10.3
Benefits paid	(87.5)	(1.3)	(66.2)
Fair value of plan assets, end of the period	313.0	$ 4.9	361.6	₨ 383.8
Funded Status	₨ (409.8)		₨ (360.6)		$ (6.2)

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- Definition

The net increase or decrease of changes in the value of the benefit obligation resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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