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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  |  |  | 12 Months Ended |
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Oct. 20, 2015 shares | Aug. 08, 2015 shares | Jul. 26, 2014 shares | Mar. 31, 2016 INR (₨) ₨ / shares shares | Mar. 31, 2016 USD ($) | Mar. 31, 2015 INR (₨) ₨ / shares shares | Mar. 31, 2014 INR (₨) ₨ / shares | Jun. 27, 2013 INR (₨) shares | 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 | Mar. 31, 2013 ₨ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, intrinsic value of options exercised at grant date |  |  |  | ₨ 66.7 |  | ₨ 122.1 | ₨ 129.7 |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  | 11,005.5 |  | 9,662.4 | 5,359.2 |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  | 169.6 |  | 236.5 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  | 30,648.5 |  | 37,020.7 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  | 169.6 |  | 236.5 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  | 20,334.8 |  | 20,295.7 |  |  |  |  |  |  |  |
Stock-based compensation, total stock compensation cost recognized under the plans |  |  |  | ₨ 12,593.8 | $ 190.1 | ₨ 9,138.8 | ₨ 5,495.5 |  |  |  |  |  |  |
Stock-based compensation, unvested options, outstanding | shares |  |  |  | 78,973,300 |  | 67,161,600 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | ₨ 952.4 |  | ₨ 773.7 |  |  |  |  |  |  |  |
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 |  |  |  | 10,313.7 |  | 16,725.1 |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  | ₨ 11,752.8 |  | ₨ 8,515.3 |  |  |  |  |  |  |  |
Employees Stock Option Scheme |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | ₨ 840.19 |  | ₨ 683.16 | ₨ 556.06 |  |  |  |  |  |  | ₨ 417.32
Stock-based compensation, weighted average period of recognition of total compensation cost not yet recognized (in years) |  |  |  | 8 months 12 days | 8 months 12 days |  |  |  |  |  |  |  |  |
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 |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | ₨ 693.00 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | 680.00 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | 598.71 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  | ₨ 975.41 |  |  |  |  |  |  |  |  |  |
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 XXIII | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  | 574,000 |  |  |  |  |  |  |  |  |  |  |
Scheme XXIV | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  | 41,085,000 |  |  |  |  |  |  |  |  |  |  |
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 Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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=6415400&loc=d3e5070-113901 + Details
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