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SHARE CAPITAL, EARNINGS PER SHARE AND DIVIDENDS - Earnings per share computation (Details) - shares	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Capital, Reserves And Other Equity Interest [Abstract]
Weighted average number of common shares outstanding, shares	268,235,077	268,693,589
Effect of dilutive stock options, shares	1,219,713	903,690
Weighted average number of common shares outstanding for diluted earnings per share calculation, shares	269,454,790	269,597,279

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- Definition

Share Capital, Reserves And Other Equity Interest

+ References

No definition available.

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 33
-IssueDate 2017-01-01
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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 33
-IssueDate 2017-01-01
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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 33
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