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Capital Stock (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 08, 2016 USD ($) installment | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 USD ($) $ / shares | Mar. 31, 2018 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Dividends declared per common share (in usd per share) | $ / shares |  | $ 0.09 | $ 0 | $ 0.18 | $ 0 |
Cash dividends payable |  | $ 19,400 | $ 0 | $ 19,400 | $ 0 |
Number of annual installments | installment | 3 |  |  |  |  |
Annual installment payment, equity or cash, amount | $ 16,670 |  |  |  |  |
Value of agreement | $ 50,000 |  |  |  |  |
Class A Voting Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized common shares (in shares) | 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 | shares |  |  |  |  |  | 266,667
Class B Non-Voting Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Authorized common shares (in shares) | 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 | shares |  |  |  |  |  | 278,334

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