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Employee Benefit Plans - Share-based Compensation Expenses and Related Tax Benefits (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based compensation expense and related tax benefit    
Total share-based compensation expense $ 13,259 $ 10,705
Income tax benefit (9,529) (11,282)
Total share-based compensation expense, net of income tax 3,730 (577)
Cost of goods sold    
Share-based compensation expense and related tax benefit    
Total share-based compensation expense 1,130 711
Marketing and selling    
Share-based compensation expense and related tax benefit    
Total share-based compensation expense 5,786 4,381
Research and development    
Share-based compensation expense and related tax benefit    
Total share-based compensation expense 1,549 1,543
General and administrative    
Share-based compensation expense and related tax benefit    
Total share-based compensation expense $ 4,794 $ 4,070