Stock Plans - Summary of Treasury Share Transactions Under the Company's Stock Repurchase Program (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Treasury shares at the beginning of period, Number of Shares	4,714	4,714	4,714	4,714
Treasury shares purchased, Number of Shares	24	0	24	0
Treasury shares at the end of period, Number of Shares	4,738	4,714	4,738	4,714
Treasury shares at the beginning of period, Amount	$ (70,459)	$ (70,459)	$ (70,459)	$ (70,459)
Treasury shares purchased, Amount	(216)	0	(216)	0
Treasury shares at the end of period, Amount	$ (70,675)	$ (70,459)	$ (70,675)	$ (70,459)