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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  |  |  |  |  |  | 12 Months Ended |  |
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Nov. 25, 2021 shares | Oct. 20, 2021 shares | Jul. 31, 2021 shares | Mar. 21, 2020 shares | Oct. 19, 2019 shares | Aug. 03, 2019 shares | Mar. 31, 2022 INR (₨) ₨ / shares shares | Mar. 31, 2022 USD ($) | Mar. 31, 2021 INR (₨) ₨ / shares shares | Mar. 31, 2020 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 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  |  |  |  | ₨ 22,077.7 |  | ₨ 26,446.8 | 13,339.6 |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  |  |  |  | 2.7 |  | 0.5 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  |  |  |  | 46,605.0 |  | 72,288.5 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  |  |  |  | 0.5 |  | 0.5 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  |  |  |  | 28,340.0 |  | 42,485.6 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, total stock compensation cost recognized under the plans |  |  |  |  |  |  | ₨ 13,874.5 | $ 182.9 | ₨ 10,603.5 | ₨ 7,476.1 |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, outstanding | shares |  |  |  |  |  |  | 92,784,900 |  | 103,715,500 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  |  |  |  | ₨ 1,273.6 |  | ₨ 1,206.3 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value at grant date |  |  |  |  |  |  | ₨ 2.1 |  | ₨ 0.0 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period |  |  |  |  |  |  | 18,265.0 |  | ₨ 29,802.9 |  |  |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  |  |  |  | ₨ 14,999.2 |  |  |  |  |  |  |  |  |  |  |  |
Equity shares, par value | ₨ / shares |  |  |  |  |  |  | ₨ 1 |  | ₨ 1 |  |  |  |  |  |  |  |  | ₨ 1 | ₨ 2
Equity shares, issued | shares |  |  |  |  |  |  | 5,545,540,976 |  | 5,512,776,482 |  |  |  |  |  |  |  |  | 5,470,763,894 |
Share-based payment arrangement, expense, tax benefit |  |  |  |  |  |  |  |  | ₨ 0.0 |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity shares, par value | ₨ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₨ 2 |
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 3 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 |  |
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 |  |  |
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 |  |  |  |
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 |  |  |  |  |
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 |  |  |  |  |  |
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 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
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 XXVII | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares | 238,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXXV | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  | 57,466,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheme XXXVI | Plan "G" |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation, options granted | shares |  |  | 25,390,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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