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Share-Based Compensation - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized share-based compensation expense $ 0      
Tax expense (benefit) related to adoption of amended accounting guidance $ 4,000,000 $ (8,000,000) $ (54,000,000)  
Options to purchase common stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock award contractual term 7 years      
Stock award vesting period 4 years      
RSUs | Directors        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested RSUs (in shares) 63,000      
RSUs | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock award vesting period 3 years      
RSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock award vesting period 4 years      
PeRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock award vesting period 4 years      
TSRUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock award vesting period 3 years      
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized 21,000,000      
Number of shares available for grant 3,000,000      
Period over which payroll is deducted to purchase shares 3 months      
Percentage of market price for share purchase 85.00%      
Percentage of market price deduction for share purchases 15.00%      
2013 Stock Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized       30,000,000
Number of shares available for grant 25,000,000      
New Accounting Pronouncement, Early Adoption, Effect        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax expense (benefit) related to adoption of amended accounting guidance $ 4,000,000