Common Stock and Dividends (Details) - USD ($)			1 Months Ended	3 Months Ended
	Nov. 04, 2024	Feb. 20, 2024	Apr. 30, 2009	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023
Repurchase of common stock, authorized amount		$ 150,000,000	$ 40,000,000
Period of repurchase of common stock		12 months	12 months
Cumulative number of shares repurchased under all stock repurchase programs	13,711,689
Cumulative cost of shares repurchased under all stock repurchase programs	$ 415,258,000
Regular 2024 Q1 Dividends
Common stock dividends paid (per share)					$ 0.66
Dividend payment date					Feb. 28, 2024
Dividend record date					Feb. 15, 2024
Regular 2024 Q3 Dividends
Common stock dividends paid (per share)				$ 0.66
Dividend payment date				Aug. 28, 2024
Dividend record date				Aug. 14, 2024
Regular 2023 Q1 Dividends
Common stock dividends paid (per share)							$ 0.63
Dividend payment date							Feb. 28, 2023
Dividend record date							Feb. 15, 2023
Regular 2023 Q3 Dividends
Common stock dividends paid (per share)						$ 0.63
Dividend payment date						Aug. 25, 2023
Dividend record date						Aug. 11, 2023