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Stock-Based Compensation - Textual (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2010
shares
Mar. 31, 2019
USD ($)
installment
Dec. 31, 2016
shares
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of installments | installment   2      
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   $ 6.1      
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 33.33333%        
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   $ 1.2      
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   1.3      
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   $ 4.0      
2010 Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for future issuance (shares) | shares 1,100,000        
Reduction of share reserve for each share granted (in shares) | shares 1        
2019 PSU and PBO Plan [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated performance goal achievement rate   100.00%      
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   118.00%      
2018 PSU and PBO Plan [Member] | Performance Shares [Member] | Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 50.00%        
2018 PSU and PBO Plan [Member] | Performance Shares [Member] | Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 50.00%        
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%  
2017 PSU and PBO Plan [Member] | Performance Shares [Member] | Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 50.00%        
2017 PSU and PBO Plan [Member] | Performance Shares [Member] | Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 50.00%        
2016 PSU Plan [Member] | Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Estimated performance goal achievement rate         142.30%
PBOs granted in period (shares) | shares     0    
2016 PSU Plan [Member] | Performance Shares [Member] | Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 50.00%        
2016 PSU Plan [Member] | Performance Shares [Member] | Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting rights 50.00%