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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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