Stock Plans - Summary of Treasury Share Transactions Under the Company's Stock Repurchase Program (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Treasury shares at the beginning of period, Number of Shares	4,833	4,714
Treasury shares purchased, Number of Shares	5	0
Treasury shares at the end of period, Number of Shares	4,838	4,714
Treasury shares at the beginning of period, Amount	$ (71,438)	$ (70,459)
Treasury shares purchased, Amount	(28)	0
Treasury shares at the end of period, Amount	$ (71,466)	$ (70,459)