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Stock-Based Compensation - Additional Information (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions |  |  |  |  | 12 Months Ended
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Apr. 21, 2017 shares | Apr. 04, 2017 shares | Oct. 20, 2015 shares | Aug. 08, 2015 shares | Mar. 31, 2018 INR (₨) ₨ / shares shares | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) ₨ / shares shares | Jul. 31, 2016 INR (₨) shares | Mar. 31, 2016 INR (₨) | 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 |  |  |  |  | ₨ 28.8 |  | ₨ 140.7 |  | ₨ 66.7 |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercised at exercise date |  |  |  |  | 34,123.2 |  | 26,951.4 |  | 11,005.5 |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding at grant date |  |  |  |  | 0.6 |  | 28.9 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options outstanding |  |  |  |  | 63,062.0 |  | 49,546.3 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable at grant date |  |  |  |  | 0.0 |  | 28.9 |  |  |  |  |  |  |  |
Stock-based compensation, aggregate intrinsic value of options exercisable |  |  |  |  | 46,092.3 |  | 34,213.2 |  |  |  |  |  |  |  |
Stock-based compensation, total stock compensation cost recognized under the plans |  |  |  |  | ₨ 6,594.6 | $ 101.3 | ₨ 8,203.2 |  | ₨ 12,593.8 |  |  |  |  |  |
Stock-based compensation, unvested options, outstanding | shares |  |  |  |  | 28,633,550 |  | 35,842,300 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, weighted average exercise price | ₨ / shares |  |  |  |  | ₨ 1,293.5 |  | ₨ 1,014.8 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value at grant date |  |  |  |  | ₨ 0.6 |  | ₨ 0.0 |  |  |  |  |  |  |  |
Stock-based compensation, unvested options, aggregate intrinsic value as at end of period |  |  |  |  | 16,969.6 |  | 15,333.0 |  |  |  |  |  |  |  |
Stock-based compensation, total estimated compensation cost to be recognized in future periods |  |  |  |  | ₨ 4,168.8 |  | ₨ 3,333.8 |  |  |  |  |  |  |  |
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) |  |  |  |  | 7 months 13 days | 7 months 13 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 |  |
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 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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