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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based compensation expense and related tax benefit        
Total share-based compensation expense $ 10,978 $ 8,450 $ 21,683 $ 16,967
Income tax benefit (3,677) (1,886) (14,959) (3,701)
Total share-based compensation expense, net of income tax 7,301 6,564 6,724 13,266
Cost of goods sold        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense 1,091 638 1,802 1,313
Marketing and selling        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense 4,343 3,244 8,724 6,681
Research and development        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense 1,633 917 3,176 1,831
General and administrative        
Share-based compensation expense and related tax benefit        
Total share-based compensation expense $ 3,911 $ 3,651 $ 7,981 $ 7,142