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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  |  |  | 12 Months Ended
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Jul. 21, 2016 INR (₨) shares | Oct. 20, 2015 shares | Aug. 08, 2015 shares | Mar. 31, 2017 INR (₨) ₨ / shares shares | Mar. 31, 2017 USD ($) | Mar. 31, 2016 INR (₨) ₨ / shares shares | Mar. 31, 2015 INR (₨) | Jun. 30, 2010 INR (₨) shares | Jun. 30, 2007 INR (₨) shares | Jun. 30, 2005 INR (₨) shares | Jun. 30, 2003 INR (₨) shares | Jan. 31, 2000 INR (₨) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, intrinsic value of options exercised at grant date |  |  |  | ₨ 140.7 |  | ₨ 66.7 | ₨ 122.1 |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  | 26,951.4 |  | 11,005.5 | 9,662.4 |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  | 28.9 |  | 169.6 |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  | 49,546.3 |  | 30,648.5 |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  | 28.9 |  | 169.6 |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  | 34,213.2 |  | 20,334.8 |  |  |  |  |  |
Stock-based compensation, total stock compensation cost recognized under the plans |  |  |  | ₨ 8,203.2 | $ 126.5 | ₨ 12,593.8 | ₨ 9,138.8 |  |  |  |  |
Stock-based compensation, unvested options, outstanding | shares |  |  |  | 35,842,300 |  | 78,973,300 |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | ₨ 1,014.8 |  | ₨ 952.4 |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value at grant date |  |  |  | ₨ 0.0 |  | ₨ 0.0 |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period |  |  |  | 15,333.0 |  | 10,313.7 |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  | ₨ 3,333.8 |  | ₨ 11,752.8 |  |  |  |  |  |
Employees Stock Option Scheme |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, weighted average period of recognition of total compensation cost not yet recognized (in years) |  |  |  | 6 months | 6 months |  |  |  |  |  |  |
Employees Stock Option Scheme | Plan ''A'' |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  |  | 50,000,000
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  |  |  |  | ₨ 100.0
Employees Stock Option Scheme | Plan ''B'' |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  |  | 50,000,000 |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  |  |  | ₨ 100.0 |
Employees Stock Option Scheme | Plan ''C'' |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance | shares |  |  |  |  |  |  |  |  |  | 50,000,000 |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  |  | ₨ 100.0 |  |
Employees Stock Option Scheme | Plan ''D'' |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance | shares |  |  |  |  |  |  |  |  | 75,000,000 |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  |  | ₨ 150.0 |  |  |
Employees Stock Option Scheme | Plan "E" |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance | shares |  |  |  |  |  |  |  | 100,000,000 |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved |  |  |  |  |  |  |  | ₨ 200.0 |  |  |  |
Employees Stock Option Scheme | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, equity shares reserved for issuance | shares | 100,000,000 |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, aggregate nominal value of equity shares reserved | ₨ 200.0 |  |  |  |  |  |  |  |  |  |  |
Employees Stock Option Scheme | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, expiration |  |  |  | 5 years | 5 years |  |  |  |  |  |  |
Employees' Stock Option Scheme, general discretionary vesting period |  |  |  | 3 years | 3 years |  |  |  |  |  |  |
Employees Stock Option Scheme | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Employees' Stock Option Scheme, general discretionary vesting period |  |  |  | 1 year | 1 year |  |  |  |  |  |  |
Scheme XXV | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  | 44,833,200 |  |  |  |  |  |  |  |  |
Scheme XXVI | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  | 3,000 |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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