Stockholders' Equity - Repurchase Programs (Details) - USD ($)	1 Months Ended		12 Months Ended
	May 13, 2021	Apr. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Jan. 31, 2019
Equity, Class of Treasury Stock [Line Items]
Authorized amount of shares to repurchase						$ 261,000,000
Dollar value of shares that may yet be repurchased			$ 60,660,000
Total number of shares repurchased (in shares)			307,080	1,296,201	1,400,699
Average price paid per share (in dollars per share)			$ 322.87	$ 146.89	$ 115.22
Dollar value of shares repurchased			$ 99,147,000	$ 190,405,000	$ 161,395,000
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Dollar value of shares that may yet be repurchased	$ 787,194,000
Total number of shares repurchased (in shares)	70,881
Average price paid per share (in dollars per share)	$ 331.06
Dollar value of shares repurchased	$ 23,466,000
Additional authorized amount of shares to repurchase		$ 750,000,000