Stock Plans - Summary of Treasury Share Transactions Under the Company's Stock Repurchase Program (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Treasury shares at the beginning of period, Number of Shares	5,005	4,838	4,945	4,833
Treasury shares purchased, Number of Shares	77	25	137	30
Treasury shares at the end of period, Number of Shares	5,082	4,863	5,082	4,863
Treasury shares at the beginning of period, Amount	$ (73,008)	$ (71,466)	$ (72,343)	$ (71,438)
Treasury shares purchased, Amount	(887)	(201)	(1,552)	(229)
Treasury shares at the end of period, Amount	$ (73,895)	$ (71,667)	$ (73,895)	$ (71,667)