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Stock-Based Compensation - Textual (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2010
shares
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Jun. 30, 2018
USD ($)
Dec. 31, 2016
shares
Dec. 31, 2017
Incentive Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Purchase price of common stock 100.00%            
Non-Statutory Stock Options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Purchase price of common stock 85.00%            
Stock options [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percent of voting interests 10.00%            
Purchase price of common stock above minimum threshold 110.00%            
Expiration period 10 years            
Award vesting period 4 years            
Compensation not yet recognized, stock options         $ 4.5    
Stock options [Member] | Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights 25.00%            
Stock options [Member] | Tranche Two [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights 75.00%            
Restricted Stock Units (RSUs) [Member] | Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 3 years            
Award vesting rights 33.3333%            
Restricted Stock Units (RSUs) [Member] | Tranche Two [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting period 4 years            
Award vesting rights 25.00%            
Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Performance awards, threshold level, number of shares, multiplier         0    
Performance Shares [Member] | Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Future vesting rights percentage         50.00%    
Performance Shares [Member] | Tranche Two [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Future vesting rights percentage         50.00%    
RSAs and RSUs [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation not yet recognized, share-based awards other than options         $ 1.8    
Performance Stock Units (PSUs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation not yet recognized, share-based awards other than options         1.5    
Performance Based Options (PBOs) [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation not yet recognized, share-based awards other than options         $ 3.7    
2017 PSU Plan [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights     50.00%        
2017 PSU Plan [Member] | Performance Shares [Member] | Scenario, Forecast [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights   50.00%          
2010 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares reserved for future issuance (shares) | shares 1,100,000            
2018 PSU and PBO Plan [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Estimated performance goal achievement rate         143.00%    
2017 PSU and PBO Plan [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Estimated performance goal achievement rate             134.20%
2016 PSU Plan [Member] | Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Award vesting rights     50.00% 50.00%      
Estimated performance goal achievement rate           142.30%  
PBOs granted in period (shares) | shares           0