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Capital Stock (Narrative) (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 08, 2016 USD ($) installment | Dec. 31, 2017 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Sep. 12, 2017 shares | Mar. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Excess tax benefits recognized associated with equity awards | $ |  |  | $ 2,300 | $ 0 |  |
Number of annual installments | installment | 3 |  |  |  |  |
Annual installment payment, equity or cash, amount | $ | $ 16,670 |  |  |  |  |
Value of agreement | $ | $ 50,000 |  |  |  |  |
2012 Plan and Starz 2016 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common shares available for grant under the share-based compensation arrangement plan (in shares) |  |  |  |  | 12,973,816 |
Prior Plans |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common shares authorized under the share-based compensation arrangement plan (in shares) |  |  |  |  | 34,790,628 |
Class A Voting Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized common shares (in shares) |  | 500,000,000 | 500,000,000 |  |  | 500,000,000
Annual installment payment, equity or cash, amount | $ |  | $ 8,300 |  |  |  |
Affiliation agreement, annual installment payment, shares issued |  | 266,667 |  |  |  |
Class B Non-Voting Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized common shares (in shares) |  | 500,000,000 | 500,000,000 |  |  | 500,000,000
Annual installment payment, equity or cash, amount | $ |  | $ 8,300 |  |  |  |
Affiliation agreement, annual installment payment, shares issued |  | 278,334 |  |  |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=79981250&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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