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Weighted Average Number of Equity Shares Used in Computing Earnings Per Equity Share (Detail) - shares	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]
Weighted average number of equity shares used in computing basic earnings per equity share	2,423,777,245	2,390,295,703	2,360,974,835
Effect of potential equity shares for stock options outstanding	23,563,558	17,849,608	25,132,636
Weighted average number of equity shares used in computing diluted earnings per equity share	2,447,340,803	2,408,145,311	2,386,107,471

X

- Definition

Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items]

+ References

No definition available.

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



-SubTopic 10



-Section 50



-Paragraph 1



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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 260



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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that 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



-Subparagraph (a)



-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



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-Section 45



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