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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, 2019 INR (₨)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 INR (₨)	Mar. 31, 2017 INR (₨)	Mar. 31, 2019 USD ($)
Change in benefit obligations:
Projected benefit obligation ("PBO"), beginning of the period	₨ 722.8	$ 10.5	₨ 722.2
Service cost	7.7	0.1	7.6	₨ 12.9
Interest cost	66.3	1.0	57.9	53.4
Actuarial (gains)/losses	6.5	0.1	22.6
Benefits paid	(125.7)	(1.8)	(87.5)
Projected benefit obligation, end of the period	677.6	9.9	722.8	722.2
Change in plan assets:
Fair value of plan assets, beginning of the period	313.0	4.5	361.6
Expected return on plan assets	18.6	0.3	23.6	26.1
Actuarial gains/(losses)	4.8	0.1	5.9
Actual return on plan assets	23.4	0.4	29.5
Employer contributions	8.8	0.1	9.4
Benefits paid	(125.7)	(1.8)	(87.5)
Fair value of plan assets, end of the period	219.5	$ 3.2	313.0	₨ 361.6
Funded Status	₨ (458.1)		₨ (409.8)		$ (6.7)

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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 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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