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Employee Benefit Plans - Share-based Compensation Expenses and Related Tax Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based compensation expense and related tax benefit        
Total share-based compensation expense $ 12,049 $ 10,978 $ 25,308 $ 21,683
Income tax benefit (2,650) (3,677) (12,179) (14,959)
Total share-based compensation expense, net of income tax 9,399 7,301 13,129 6,724
Cost of goods sold        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense 791 1,091 1,921 1,802
Marketing and selling        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense 4,864 4,343 10,650 8,724
Research and development        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense 1,935 1,633 3,484 3,176
General and administrative        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense $ 4,459 $ 3,911 $ 9,253 $ 7,981