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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 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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