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Share-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Apr. 01, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common shares reserved for grant (in shares) 2,000,000   2,000,000   6,900,000 4,500,000
Number of options outstanding (in shares) 3,200,000   3,200,000      
Weighted average exercise price (in dollars per share) $ 9.22   $ 9.22      
RSI and RSL Employees and Consultants | Share-Based Compensation Allocated to the Company by RSL            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation $ 300,000 $ 1,400,000 $ 500,000 $ 4,000,000    
Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares) 1,000,000 1,100,000 1,900,000 1,100,000    
Allocated share-based compensation $ 1,500,000 $ 300,000 $ 2,800,000 $ 300,000    
Unrecognized compensation expense related to non-vested options $ 24,900,000   $ 24,900,000      
Unrecognized compensation expense, period for recognition     3 years 3 months 5 days      
Restricted Share Awards            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock awards granted (in shares) 0 0 600,000 1,100,000    
Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share-based compensation $ 3,412   $ 3,412      
Restricted stock awards granted (in shares) 10,000 0 10,000 0    
Restricted Stock and Restricted Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Allocated share-based compensation $ 900,000 $ 400,000 $ 1,500,000 $ 400,000    
Unrecognized compensation expense, period for recognition     4 years 18 days      
Unrecognized compensation expense related to awards other than options 11,200,000   $ 11,200,000      
Non-employee Stock Option | RSI and RSL Employees and Consultants | Stock Options Granted to Non-Employees            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted (in shares)     0 100,000    
Share-based compensation related to stock options granted to consultants 100,000 $ 100,000 $ 200,000 $ 100,000    
Unrecognized compensation expense related to options for non-employees $ 100,000   $ 100,000      
Unrecognized compensation expense, period for recognition, related to options for non-employees     2 years 10 months 17 days