Capital Stock (Narrative - Equity) (Details) $ in Thousands, shares in Millions	Dec. 08, 2016 USD ($) installment	Mar. 31, 2022 shares	Mar. 31, 2021 shares
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