Common Stock (Other) (Details)					12 Months Ended
	Jan. 25, 2022 USD ($)	Jan. 04, 2022 USD ($) $ / shares	Sep. 08, 2021 USD ($)	Jul. 30, 2021 USD ($) $ / shares	Mar. 31, 2022 USD ($) item shares	Mar. 31, 2021 shares	Jul. 01, 2013 $ / shares shares
Common Stock.
Dividends declared (in dollars per share) | $ / shares		$ 1.00		$ 1.00
Dividends, Common Stock | $		$ 40,100,000		$ 40,400,000
Dividends paid in cash | $	$ 39,900,000		$ 40,200,000		$ 80,082,210
Dividends payable | $	$ 200,000		$ 200,000		$ 494,180
Common stock
Authorized capital stock (in shares) | shares							500,000,000
Par value of capital stock (in dollars per share) | $ / shares							$ 0.01
Common Stock, Shares Authorized | shares					450,000,000	450,000,000	450,000,000
Preferred Stock, Shares Authorized | shares					50,000,000	50,000,000	50,000,000
Number of votes entitled to shareholders | item					1