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Concentrations of Credit Risk (Detail) ₨ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2017 INR (₨)	Mar. 31, 2016 INR (₨)	Mar. 31, 2017 USD ($)
Concentration Risk [Line Items]
Gross loans	₨ 5,988,909.7	₨ 4,992,834.4	$ 92,350.2
Fair Value Of Credit Substitutes	419,540.6	297,241.0	6,469.4
Non-funded exposure	868,225.1	737,363.6
Total Exposure	₨ 7,276,675.4	₨ 6,027,439.0	112,207.8
Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	100.00%	100.00%
Consumer Loans
Concentration Risk [Line Items]
Gross loans	₨ 1,526,978.2	₨ 670,622.8
Fair Value Of Credit Substitutes	0.0	0.0
Non-funded exposure	0.2	21.6
Total Exposure	₨ 1,526,978.4	₨ 670,644.4	23,546.3
Consumer Loans | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	21.00%	11.10%
Agriculture and Allied Activities
Concentration Risk [Line Items]
Gross loans		₨ 550,848.4
Fair Value Of Credit Substitutes		0.0
Non-funded exposure		1,616.2
Total Exposure		₨ 552,464.6
Agriculture and Allied Activities | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%		9.30%
Wholesale Trade
Concentration Risk [Line Items]
Gross loans		₨ 349,927.1
Fair Value Of Credit Substitutes		12,389.4
Non-funded exposure		36,108.5
Total Exposure		₨ 398,425.0
Wholesale Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%		6.60%
Services
Concentration Risk [Line Items]
Gross loans		₨ 306,593.9
Fair Value Of Credit Substitutes		3,425.4
Non-funded exposure		22,997.3
Total Exposure		₨ 333,016.6
Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%		5.50%
Retail Trade
Concentration Risk [Line Items]
Gross loans	₨ 320,876.9	₨ 253,373.6
Fair Value Of Credit Substitutes	2,941.7	4,721.8
Non-funded exposure	9,952.3	8,747.7
Total Exposure	₨ 333,770.9	₨ 266,843.1	5,146.8
Retail Trade | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.60%	4.40%
Agriculture Production - Food
Concentration Risk [Line Items]
Gross loans	₨ 282,673.8
Fair Value Of Credit Substitutes	2,075.0
Non-funded exposure	458.3
Total Exposure	₨ 285,207.1		4,398.0
Agriculture Production - Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.90%
Automobile and Auto Ancillary
Concentration Risk [Line Items]
Gross loans	₨ 240,301.6	₨ 199,606.7
Fair Value Of Credit Substitutes	31,661.9	11,092.6
Non-funded exposure	24,816.3	16,579.9
Total Exposure	₨ 296,779.8	₨ 227,279.2	4,576.4
Automobile and Auto Ancillary | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.10%	3.80%
NBFC/Financial Intermediaries
Concentration Risk [Line Items]
Gross loans	₨ 180,220.7	₨ 130,684.6
Fair Value Of Credit Substitutes	158,378.6	89,328.1
Non-funded exposure	5,211.1	2,174.3
Total Exposure	₨ 343,810.4	₨ 222,187.0	5,301.6
NBFC/Financial Intermediaries | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	4.70%	3.70%
Wholesale Trade- Consumer Goods
Concentration Risk [Line Items]
Gross loans	₨ 232,111.9
Fair Value Of Credit Substitutes	5,190.8
Non-funded exposure	20,611.1
Total Exposure	₨ 257,913.8		3,977.1
Wholesale Trade- Consumer Goods | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.60%
Consumer Services
Concentration Risk [Line Items]
Gross loans	₨ 260,053.9
Fair Value Of Credit Substitutes	4,500.5
Non-funded exposure	20,152.1
Total Exposure	₨ 284,706.5		4,390.2
Consumer Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.90%
Wholesale Trade- Non Consumer Goods
Concentration Risk [Line Items]
Gross loans	₨ 166,940.1
Fair Value Of Credit Substitutes	3,144.3
Non-funded exposure	34,878.0
Total Exposure	₨ 204,962.4		3,160.6
Wholesale Trade- Non Consumer Goods | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.80%
Road Transportation
Concentration Risk [Line Items]
Gross loans	₨ 241,771.3	₨ 183,707.5
Fair Value Of Credit Substitutes	0.0	690.7
Non-funded exposure	4,104.8	3,342.8
Total Exposure	₨ 245,876.1	₨ 187,741.0	3,791.5
Road Transportation | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	3.40%	3.10%
Engineering
Concentration Risk [Line Items]
Gross loans	₨ 110,827.8	₨ 95,022.6
Fair Value Of Credit Substitutes	4,900.7	9,122.4
Non-funded exposure	74,511.2	67,166.1
Total Exposure	₨ 190,239.7	₨ 171,311.1	2,933.5
Engineering | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.80%
Agriculture Production-Non Food
Concentration Risk [Line Items]
Gross loans	₨ 202,350.3
Fair Value Of Credit Substitutes	0.0
Non-funded exposure	1.5
Total Exposure	₨ 202,351.8		3,120.3
Agriculture Production-Non Food | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.80%
Food And Beverage
Concentration Risk [Line Items]
Gross loans	₨ 166,494.3	₨ 152,253.7
Fair Value Of Credit Substitutes	12,354.5	3,235.9
Non-funded exposure	12,309.0	7,814.2
Total Exposure	₨ 191,157.8	₨ 163,303.8	2,947.7
Food And Beverage | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.70%
Coal & Petroleum Products
Concentration Risk [Line Items]
Gross loans	₨ 48,513.8	₨ 46,279.5
Fair Value Of Credit Substitutes	2,136.8	5,173.9
Non-funded exposure	123,490.2	108,033.7
Total Exposure	₨ 174,140.8	₨ 159,487.1	2,685.3
Coal & Petroleum Products | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.40%	2.60%
Power
Concentration Risk [Line Items]
Gross loans	₨ 125,213.0	₨ 103,437.7
Fair Value Of Credit Substitutes	20,395.7	15,770.2
Non-funded exposure	24,455.8	23,495.7
Total Exposure	₨ 170,064.5	₨ 142,703.6	2,622.4
Power | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%	2.40%
Real Estate and Property Services
Concentration Risk [Line Items]
Gross loans	₨ 168,660.4	₨ 121,992.9
Fair Value Of Credit Substitutes	1,585.4	3,200.9
Non-funded exposure	20,566.5	16,380.3
Total Exposure	₨ 190,812.3	₨ 141,574.1	2,942.4
Real Estate and Property Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.60%	2.30%
Iron and Steel
Concentration Risk [Line Items]
Gross loans		₨ 97,934.7
Fair Value Of Credit Substitutes		19,910.6
Non-funded exposure		17,559.2
Total Exposure		₨ 135,404.5
Iron and Steel | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%		2.20%
Business Services
Concentration Risk [Line Items]
Gross loans	₨ 159,666.1
Fair Value Of Credit Substitutes	1,786.1
Non-funded exposure	6,561.8
Total Exposure	₨ 168,014.0		2,590.8
Business Services | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%
Others (none greater than 2%)
Concentration Risk [Line Items]
Gross loans	₨ 1,406,387.9	₨ 1,730,548.7
Fair Value Of Credit Substitutes	143,679.7	119,179.1
Non-funded exposure	343,910.8	405,326.1
Total Exposure	₨ 1,893,978.4	₨ 2,255,053.9	29,205.5
Others (none greater than 2%) | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	26.00%	37.50%
Banks and Financial Institutions
Concentration Risk [Line Items]
Gross loans	₨ 40,763.1
Fair Value Of Credit Substitutes	3,402.7
Non-funded exposure	122,099.8
Total Exposure	₨ 166,265.6		2,563.8
Banks and Financial Institutions | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.30%
Telecom
Concentration Risk [Line Items]
Gross loans	₨ 108,104.6
Fair Value Of Credit Substitutes	21,406.2
Non-funded exposure	20,134.3
Total Exposure	₨ 149,645.1		$ 2,307.6
Telecom | Lender Concentration Risk | Concentration of Credit Risk by Industry
Concentration Risk [Line Items]
%	2.10%

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Maximum amount of exposure due to credit risk that, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

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Amount of unfunded commitments for which the entity is obligated, including, but not limited to, financial standby letter of credit, value of guarantees, contracts that contingently require the guarantor to make payments or perform services.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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