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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended
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Feb. 02, 2019 shares | Sep. 29, 2018 shares | Sep. 01, 2018 shares | Aug. 04, 2017 shares | Apr. 21, 2017 shares | Mar. 31, 2019 INR (₨) ₨ / shares shares | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨) ₨ / shares shares | Mar. 31, 2017 INR (₨) | Jul. 31, 2016 INR (₨) shares | Jun. 30, 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, intrinsic value of options exercised at grant date |  |  |  |  |  | ₨ 0.0 |  | ₨ 28.8 | ₨ 140.7 |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  |  |  | 33,117.4 |  | 34,123.2 | 26,951.4 |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  |  |  | 0.6 |  | 0.6 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  |  |  | 65,091.1 |  | 63,062.0 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  |  |  | 0.2 |  | 0.0 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  |  |  | 52,441.6 |  | 46,092.3 |  |  |  |  |  |  |  |
Stock-based compensation, total stock compensation cost recognized under the plans |  |  |  |  |  | ₨ 5,343.3 | $ 77.3 | ₨ 6,594.6 | ₨ 8,203.2 |  |  |  |  |  |  |
Stock-based compensation, unvested options, outstanding | shares |  |  |  |  |  | 28,001,550 |  | 28,633,550 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  |  |  | ₨ 1,867.2 |  | ₨ 1,293.5 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value at grant date |  |  |  |  |  | ₨ 0.3 |  | ₨ 0.6 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period |  |  |  |  |  | 12,649.5 |  | 16,969.6 |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  |  |  | ₨ 7,065.9 |  | ₨ 4,168.8 |  |  |  |  |  |  |  |
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) |  |  |  |  |  | 11 months 1 day | 11 months 1 day |  |  |  |  |  |  |  |  |
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 | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Scheme XXIX | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  | 19,119,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXX | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  | 440,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXVII | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  |  | 16,865,850 |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXVIII | Plan "F" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  |  |  | 16,200 |  |  |  |  |  |  |  |  |  |  |
Scheme Thirty One [Member] | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares | 336,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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