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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended |  |
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Mar. 21, 2020 shares | Oct. 19, 2019 shares | Aug. 03, 2019 shares | Feb. 02, 2019 shares | Sep. 29, 2018 shares | Sep. 01, 2018 shares | Mar. 31, 2020 INR (₨) ₨ / shares shares | Mar. 31, 2020 USD ($) | Mar. 31, 2019 INR (₨) ₨ / shares shares | Mar. 31, 2018 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 | Sep. 20, 2019 ₨ / shares shares | Sep. 19, 2019 ₨ / 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 |  | ₨ 0.0 | ₨ 28.8 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  |  |  |  | 13,339.6 |  | 33,117.4 | 34,123.2 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  |  |  |  | 0.5 |  | 0.6 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  |  |  |  | 17,418.0 |  | 65,091.1 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  |  |  |  | 0.4 |  | 0.2 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  |  |  |  | 16,291.8 |  | 52,441.6 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, total stock compensation cost recognized under the plans |  |  |  |  |  |  | ₨ 7,476.1 | $ 99.2 | ₨ 5,343.3 | ₨ 6,594.6 |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, outstanding | shares |  |  |  |  |  |  | 78,401,210 |  | 56,003,100 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  |  |  |  | ₨ 1,113.5 |  | ₨ 933.6 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value at grant date |  |  |  |  |  |  | ₨ 0.2 |  | ₨ 0.3 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period |  |  |  |  |  |  | 1,126.2 |  | 12,649.5 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  |  |  |  | ₨ 13,294.0 |  | ₨ 7,065.9 |  |  |  |  |  |  |  |  |  |
Equity shares, par value | ₨ / shares |  |  |  |  |  |  | ₨ 1.0 |  | ₨ 1.0 |  |  |  |  |  |  |  |  | ₨ 1.0 | ₨ 2.0
Equity shares, issued | shares |  |  |  |  |  |  | 5,483,286,460 |  | 5,446,613,220 |  |  |  |  |  |  |  |  | 5,470,763,894 |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity shares, par value | ₨ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 2.0 |
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) |  |  |  |  |  |  | 1 year 2 months 15 days | 1 year 2 months 15 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000.0 |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000,000.0 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 200,000,000.0 |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 200,000,000.0 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 200,000,000.0 |  |  |  |  |  |  |  |
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 |  |  |  |  |  | 38,238,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXX | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  |  |  | 880,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXXI | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  |  | 672,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXXII | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  | 578,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXXIII | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  | 46,175,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXXIV | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares | 1,020,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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