Capital Stock (Stock Options Activity) (Details) - Stock Options - USD ($)	12 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	13,214,696	12,094,010	8,021,382
Granted (in shares)	3,538,346	1,765,809	4,955,889
CSARs converted to options (in shares)			733,334
Exercised (in shares)	(640,008)	(609,160)	(1,598,035)
Forfeited or expired (in shares)	(19,138)	(35,963)	(18,560)
Outstanding, end of period (in shares)	16,093,896	13,214,696	12,094,010
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, Weighted Average Exercise Price (in usd per share)	$ 21.26	$ 19.70	$ 12.87
Granted, Weighted Average Exercise Price (in usd per share)	31.50	29.49	29.40
CSARs converted to options, Weighted Average Exercise Price (in usd per share)			7.56
Exercised, Weighted Average Exercise Price (in usd per share)	13.01	14.39	9.86
Forfeited or expired, Weighted Average Exercise Price (in usd per share)	26.54	17.69	15.68
Outstanding, Weighted Average Exercise Price (in usd per share)	$ 23.83	$ 21.26	$ 19.70
Outstanding, Weighted Average Remaining Contractual Term In Years	5 years 11 months 7 days
Outstanding, Aggregate Intrinsic Value	$ 54,088,481
Outstanding, vested or expected to vest in the future (in shares)	16,002,844
Outstanding, vested or expected to vest in the future, Weighted Average Exercise Price (in usd per share)	$ 23.82
Outstanding, vested or expected to vest in the future, Weighted Average Remaining Contractual Term In Years	5 years 11 months 2 days
Outstanding, vested or expected to vest in the future, Aggregate Intrinsic Value	$ 54,067,625
Exercisable (in shares)	8,840,250
Exercisable, Weighted Average Exercise Price (in usd per share)	$ 19.00
Exercisable, Weighted Average Remaining Contractual Term In Years	4 years 9 months 20 days
Exercisable, Aggregate Intrinsic Value	$ 50,968,223

The number of non-option equity instruments converted to options.

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Weighted average per share amount at which holders can acquire shares of common stock by exercise of options.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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