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Reconciliations of Basic and Diluted Earnings Per Equity Share and Earnings per American Depositary Shares (Detail) | 12 Months Ended
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Mar. 31, 2017 ₨ / shares | Mar. 31, 2017 $ / shares | Mar. 31, 2016 ₨ / shares | Mar. 31, 2015 ₨ / shares
Earnings Per Share Disclosure [Line Items] |  |  |  |
Basic earnings per share | (per share) | ₨ 55.23 | $ 0.85 | ₨ 46.84 | ₨ 40.94
Effect of potential equity shares for stock options outstanding | (per share) | 0.66 | 0.01 | 0.51 | 0.39
Diluted earnings per share | (per share) | 54.57 | 0.84 | 46.33 | 40.55
Basic earnings per ADS | (per share) | 165.69 | 2.55 | 140.52 | 122.82
Diluted earnings per ADS | (per share) | 163.71 | 2.52 | 138.99 | 121.65
American Depository Shares | Stock Compensation Plan |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |
Effect of potential equity shares for stock options outstanding | (per share) | ₨ 1.98 | $ 0.03 | ₨ 1.53 | ₨ 1.17

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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