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Capital Stock (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 08, 2016
USD ($)
installment
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax Deficiencies Written Off   $ 1,100 $ 400  
Dividends declared per common share (in usd per share) | $ / shares   $ 0.09 $ 0  
Cash dividends payable   $ 19,200 $ 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
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
Annual installment payment, equity or cash, amount       $ 8,300
Affiliation agreement, annual installment payment, shares issued | shares       278,334