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Capital Stock (Stock Options Activity Before Dec 8, 2016) (Details) - Stock Options - $ / shares		8 Months Ended	12 Months Ended
	Dec. 08, 2016	Dec. 07, 2016	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	19,393,516	16,093,896	13,214,696
Granted (in shares)		5,997,539	3,538,346
Exercised (in shares)		(2,145,852)	(640,008)
Forfeited or expired (in shares)		(552,067)	(19,138)
Reclassification of common shares to newly issued Class A voting shares and Class B non-voting shares (in shares)	(19,393,516)
Outstanding, end of period (in shares)	0	19,393,516	16,093,896
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)	$ 24.80	$ 23.83	$ 21.26
Granted, Weighted Average Exercise Price (in usd per share)		22.73	31.50
Exercised, Weighted Average Exercise Price (in usd per share)		9.78	13.01
Forfeited or expired, Weighted Average Exercise Price (in usd per share)		32.39	26.54
Outstanding, Weighted Average Exercise Price (in usd per share)		$ 24.80	$ 23.83

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Options, Reclassification of Common Stock

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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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-Publisher FASB
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-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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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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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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Number of share options (or share units) exercised during the current period.

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