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Share-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 2 Months Ended 12 Months Ended
Apr. 01, 2017
Apr. 30, 2017
Sep. 30, 2016
Aug. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Mar. 31, 2018
Mar. 31, 2017
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Vested options (in shares)             502,361 28,406  
Options vested during period (in shares)           0      
Unrecognized share-based compensation             $ 33,700,000    
Unrecognized share-based compensation, period for recognition             3 years 1 month 28 days    
Options granted (in shares)   32,500         2,338,116 1,525,857  
Exercise price of options granted in period (in USD per share)             $ 12.50    
Fair value of underlying common shares (in USD per share)             15.00   $ 15.00
Weighted-average grant date fair value per share of options granted (in USD per share)           $ 0.00 $ 8.35 $ 11.90  
RSL | RSL | Share-Based Compensation Allocated to the Company by RSL                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based compensation           $ 1,000,000 $ 1,000,000 $ 4,900,000  
Employee and Non-employee Stock Option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted (in shares)       600,000          
Weighted-average grant date fair value per share of options granted (in USD per share)       $ 13.44          
Employee and Non-employee Stock Option | Principal Owner                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Threshold percentage of total voting power of company             10.00%    
Exercise price as a percentage of fair value             110.00%    
Contractual term             5 years    
Restricted Share Awards                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Awards vested during period (in shares)           0 $ 2,500,000 $ 0  
Awards granted (in shares)         1,100,000     1,128,222  
Fair value of awards granted (in USD per share)         $ 5.10        
Restricted Share Awards | Originally reported                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Fair value of awards granted (in USD per share)         $ 1.52        
Non-employee Stock Option | RSI Employees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted (in shares)       100,000          
Non-employee Stock Option | RSI Employees | Stock Options Granted to Non-Employees                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted (in shares)               100,000  
Exercise price of options granted in period (in USD per share)               $ 2.41  
Share-based compensation           $ 0 300,000 $ 400,000  
Unrecognized compensation expense, period for recognition, related to options for non-employees             $ 100,000    
Unrecognized compensation expense, period for recognition, related to options for non-employees, period for recognition             2 years 4 months 17 days    
Non-employee Stock Option | RSI Employees | Originally reported                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of options granted in period (in USD per share)       $ 2.38          
Options                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Options granted (in shares)     600,000            
Weighted-average grant date fair value per share of options granted (in USD per share)     $ 12.78            
Options | Originally reported                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Exercise price of options granted in period (in USD per share)     $ 4.00            
Restricted Stock Units | Principal Executive Officer | RSL RSUs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Share-based compensation             $ 0 $ 0  
Unrecognized compensation cost related to restricted stock units             $ 900,000    
Restricted Stock Units | Principal Executive Officer | RSL | RSL RSUs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Awards granted (in shares)               66,845  
Requisite service period             8 years    
2016 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares reserved for grant (in shares)         4,500,000   1,700,000    
Common shares reserved for grant, annual percentage increase         4.00%        
Increase in common shares reserved for grant (in shares) 2,400,000