Employee Benefit Plans - Share-based Compensation Expenses and Related Tax Benefits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Share-based compensation expense and related tax benefit
Total share-based compensation expense	$ 11,556	$ 9,387	$ 33,239	$ 26,354
Income tax provision (benefit)	3,038	(2,391)	(11,921)	(6,092)
Total share-based compensation expense, net of income tax	14,594	6,996	21,318	20,262
Cost of goods sold
Share-based compensation expense and related tax benefit
Total share-based compensation expense	960	617	2,762	1,930
Marketing and selling
Share-based compensation expense and related tax benefit
Total share-based compensation expense	4,624	4,006	13,348	10,687
Research and development
Share-based compensation expense and related tax benefit
Total share-based compensation expense	1,621	1,176	4,797	3,007
General and administrative
Share-based compensation expense and related tax benefit
Total share-based compensation expense	$ 4,351	$ 3,588	$ 12,332	$ 10,730