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Capital Stock (Restricted Share Unit Activity After Dec 8, 2016) (Details) - $ / shares |  | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 08, 2016 | Mar. 31, 2017 | Dec. 07, 2016 | Mar. 31, 2018 | Mar. 31, 2016
Restricted Share Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Granted (in shares) |  |  | 1,537,632 |  | 1,461,521
Vested (in shares) |  |  | (1,789,908) |  | (1,438,207)
Forfeited (in shares) |  |  | (164,592) |  | (37,910)
Outstanding (in shares) | 0 |  | 1,230,564 |  | 1,647,432
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Granted, Weighted Average Grant Date Fair Value (in usd per share) |  |  | $ 20.89 |  | $ 32.36
Vested, Weighted Average Grant Date Fair Value (in usd per share) |  |  | 25.01 |  | 28.22
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) |  |  | 30.18 |  | 30.36
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) |  |  | $ 28.18 |  | $ 31.74
Restricted Share Units (RSUs) | Class A Voting Common Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Outstanding (in shares) |  | 519,148 |  | 230,561 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) |  | $ 27.85 |  | $ 28.49 |
Restricted Share Units (RSUs) | Class B Non-Voting Common Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Outstanding (in shares) |  | 911,071 |  | 1,511,648 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) |  | $ 26.62 |  | $ 28.71 |
Activity After Share Reclassification And Starz Merger | Restricted Share Units (RSUs) | Class A Voting Common Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) | 615,103 |  |  |  |
Issuance for Lions Gate replacement awards (in shares) |  | 0 |  |  |
Granted (in shares) |  | 15,529 |  | 117,295 |
Vested (in shares) |  | (105,796) |  | (393,137) |
Forfeited (in shares) |  | (5,688) |  | (12,745) |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Issuance of Cass A and Class B common stock upon reclassification of common stock, weighted average grant date fair value (in usd per share) | $ 26.48 |  |  |  |
Issuance for Lions Gate replacement awards, weighted average grant date fair value (in usd per share) |  | $ 0.00 |  |  |
Granted, Weighted Average Grant Date Fair Value (in usd per share) |  | 26.78 |  | $ 29.11 |
Vested, Weighted Average Grant Date Fair Value (in usd per share) |  | 29.55 |  | 27.79 |
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) |  | $ 30.91 |  | $ 29.69 |
Activity After Share Reclassification And Starz Merger | Restricted Share Units (RSUs) | Class B Non-Voting Common Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) | 615,103 |  |  |  |
Issuance for Lions Gate replacement awards (in shares) |  | 0 |  |  |
Granted (in shares) |  | 410,857 |  | 1,200,352 |
Vested (in shares) |  | (109,201) |  | (575,659) |
Forfeited (in shares) |  | (5,688) |  | (24,116) |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Issuance of Cass A and Class B common stock upon reclassification of common stock, weighted average grant date fair value (in usd per share) | $ 28.20 |  |  |  |
Issuance for Lions Gate replacement awards, weighted average grant date fair value (in usd per share) |  | $ 0.00 |  |  |
Granted, Weighted Average Grant Date Fair Value (in usd per share) |  | 25.06 |  | $ 29.44 |
Vested, Weighted Average Grant Date Fair Value (in usd per share) |  | 29.41 |  | 26.97 |
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) |  | $ 30.91 |  | $ 28.06 |
Activity After Share Reclassification And Starz Merger | Restricted Stock | Class B Non-Voting Common Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) | 0 |  |  |  |
Issuance for Lions Gate replacement awards (in shares) |  | 1,861,342 |  |  |
Granted (in shares) |  | 0 |  | 0 |
Vested (in shares) |  | (373,148) |  | (587,733) |
Forfeited (in shares) |  | (141,259) |  | (269,801) |
Outstanding (in shares) |  | 1,346,935 |  | 489,401 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Issuance of Cass A and Class B common stock upon reclassification of common stock, weighted average grant date fair value (in usd per share) | $ 0.00 |  |  |  |
Issuance for Lions Gate replacement awards, weighted average grant date fair value (in usd per share) |  | $ 25.70 |  |  |
Granted, Weighted Average Grant Date Fair Value (in usd per share) |  | 0.00 |  | $ 25.70 |
Vested, Weighted Average Grant Date Fair Value (in usd per share) |  | 25.70 |  | 25.70 |
Forfeited, Weighted Average Grant Date Fair Value (in usd per share) |  | 25.70 |  | 25.70 |
Outstanding, Weighted Average Grant Date Fair Value (in usd per share) |  | $ 25.70 |  | $ 25.70 |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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