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Capital Stock (Stock Options Activity After Dec 8, 2016) (Details) - Stock Options - USD ($) |  | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 08, 2016 | Mar. 31, 2017 | Dec. 07, 2016 | Mar. 31, 2018 | Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Exercised (in shares) |  |  |  | (2,145,852) |  | (640,008)
Forfeited or expired (in shares) |  |  |  | (552,067) |  | (19,138)
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] |  |  |  |  |  |
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
Class A Voting Common Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Outstanding, end of period (in shares) |  | 9,089,915 | [1] |  | 8,636,437 |
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) |  | $ 26.67 | [1] |  | $ 26.93 |
Class B Non-Voting Common Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Outstanding, end of period (in shares) |  | 24,301,704 | [1] |  | 23,463,115 |
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) |  | $ 19.63 | [1] |  | $ 20.56 |
Activity After Share Reclassification And Starz Merger | Class A Voting Common Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) | 9,528,634 |  |  |  |  |
Issuance for Lions Gate replacement awards (in shares) |  | 0 |  |  |  |
Granted (in shares) |  | 36,645 | [1] |  | 455,395 |
Exercised (in shares) |  | (447,140) | [1] |  | (537,930) |
Forfeited or expired (in shares) |  | (28,224) | [1] |  | (370,943) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Issuance of Class A and Class B common stock upon reclassification of common stock, weighted average exercise price (in usd per share) | $ 25.53 |  |  |  |  |
Issuance for Lions Gate replacement awards (in usd per share) |  | $ 0.00 |  |  |  |
Granted, Weighted Average Exercise Price (in usd per share) |  | 26.03 | [1] |  | $ 30.78 |
Exercised, Weighted Average Exercise Price (in usd per share) |  | 10.25 | [1] |  | 19.29 |
Forfeited or expired, Weighted Average Exercise Price (in usd per share) |  | $ 33.65 | [1] |  | $ 36.31 |
Outstanding, Weighted Average Remaining Contractual Term In Years |  |  |  |  | 6 years 3 months 22 days |
Outstanding, Aggregate Intrinsic Value |  |  |  |  | $ 20,567,305 |
Outstanding, vested or expected to vest in the future (in shares) |  |  |  |  | 8,606,761 |
Outstanding, vested or expected to vest in the future, Weighted Average Exercise Price (in usd per share) |  |  |  |  | $ 26.94 |
Outstanding, vested or expected to vest in the future, Weighted Average Remaining Contractual Term In Years |  |  |  |  | 6 years 3 months 22 days |
Outstanding, vested or expected to vest in the future, Aggregate Intrinsic Value |  |  |  |  | $ 20,449,524 |
Exercisable (in shares) |  |  |  |  | 5,498,184 |
Exercisable, Weighted Average Exercise Price (in usd per share) |  |  |  |  | $ 28.12 |
Exercisable, Weighted Average Remaining Contractual Term In Years |  |  |  |  | 5 years 26 days |
Exercisable, Aggregate Intrinsic Value |  |  |  |  | $ 12,157,537 |
Activity After Share Reclassification And Starz Merger | Class B Non-Voting Common Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |  |
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) | 9,528,634 |  |  |  |  |
Issuance for Lions Gate replacement awards (in shares) |  | 15,395,707 |  |  |  |
Granted (in shares) |  | 1,783,446 | [1] |  | 2,405,095 |
Exercised (in shares) |  | (2,198,914) | [1] |  | (2,612,877) |
Forfeited or expired (in shares) |  | (207,169) | [1] |  | (630,807) |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |  |  |  |
Issuance of Class A and Class B common stock upon reclassification of common stock, weighted average exercise price (in usd per share) | $ 24.68 |  |  |  |  |
Issuance for Lions Gate replacement awards (in usd per share) |  | $ 14.68 |  |  |  |
Granted, Weighted Average Exercise Price (in usd per share) |  | 25.17 | [1] |  | $ 28.84 |
Exercised, Weighted Average Exercise Price (in usd per share) |  | 12.43 | [1] |  | 17.15 |
Forfeited or expired, Weighted Average Exercise Price (in usd per share) |  | $ 25.52 | [1] |  | $ 30.72 |
Outstanding, Weighted Average Remaining Contractual Term In Years |  |  |  |  | 6 years 2 months 1 day |
Outstanding, Aggregate Intrinsic Value |  |  |  |  | $ 130,946,902 |
Outstanding, vested or expected to vest in the future (in shares) |  |  |  |  | 23,317,418 |
Outstanding, vested or expected to vest in the future, Weighted Average Exercise Price (in usd per share) |  |  |  |  | $ 20.52 |
Outstanding, vested or expected to vest in the future, Weighted Average Remaining Contractual Term In Years |  |  |  |  | 6 years 1 month 24 days |
Outstanding, vested or expected to vest in the future, Aggregate Intrinsic Value |  |  |  |  | $ 130,846,866 |
Exercisable (in shares) |  |  |  |  | 16,776,803 |
Exercisable, Weighted Average Exercise Price (in usd per share) |  |  |  |  | $ 18.55 |
Exercisable, Weighted Average Remaining Contractual Term In Years |  |  |  |  | 4 years 8 months 12 days |
Exercisable, Aggregate Intrinsic Value |  |  |  |  | $ 124,449,854 |
[1] | Amounts for the year ended March 31, 2017 have been reclassified to conform to the current period presentation, and now include the Company’s equity-settled share-appreciation rights ("SARs"), which were previously accounted for as cash-settled SARs.

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