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Stock-Based Compensation - 2016 Market-Based RSAs and RSUs (Details) - 2016 Market-Based RSAs and RSUs - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended
Jan. 14, 2016
Feb. 28, 2018
Sep. 30, 2018
Mar. 31, 2018
Market-Based RSAs and RSUs        
Stock-based compensation        
Reversal of previously recognized compensation expense     $ 0.2  
Market-Based RSAs and RSUs | TSR and Performance Measures | Released on February 20, 2018        
Stock-based compensation        
Vesting percentage   66.70%    
Market-Based RSAs        
Stock-based compensation        
Forfeited (in shares)     34,722  
Market-Based RSAs | TSR and Performance Measures | Released on February 20, 2018        
Stock-based compensation        
Exercised (in shares)   69,440    
Market-Based RSAs | TSR and Performance Measures | Senior Management        
Stock-based compensation        
Granted (in shares) 282,394      
Vested (in shares)   118,821    
Stock-based compensation, net       $ 0.7
Forfeited (in shares)   59,411    
Market-Based RSUs        
Stock-based compensation        
Forfeited (in shares)     15,432  
Market-Based RSUs | TSR and Performance Measures | Released on February 20, 2018        
Stock-based compensation        
Exercised (in shares)   30,862    
Market-Based RSUs | TSR and Performance Measures | Senior Management        
Stock-based compensation        
Granted (in shares) 46,294