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Capital Stock (Narrative - Equity) (Details) $ in Thousands, shares in Millions | Dec. 08, 2016 USD ($) installment | Mar. 31, 2020 shares | Mar. 31, 2019 shares
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Class of Stock [Line Items] |  |  |
Affiliation agreement, number of annual installments | installment | 3 |  |
Affiliation agreement, annual installment payment, equity or cash, amount | $ | $ 16,670 |  |
Affiliation agreement, value of agreement | $ | $ 50,000 |  |
Class A Voting Common Shares |  |  |
Class of Stock [Line Items] |  |  |
Authorized common shares (in shares) | shares |  | 500.0 | 500.0
Class B Non-Voting Common Shares |  |  |
Class of Stock [Line Items] |  |  |
Authorized common shares (in shares) | shares |  | 500.0 | 500.0

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- Definition Affiliation Agreement, Annual Installment Payment, Equity or Cash, Amount + References No definition available. + Details
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- Definition Affiliation Agreement, Number of Annual Installments + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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