Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]
Beginning balance at Mar. 31, 2022	$ 1,133,556	$ 387		$ 1,136,344	$ (3,175)
Net Income (Loss)	461,540			461,540
Stock Option Exercises and Restricted Share Vesting	5,418	2	$ 5,416
Stock Compensation Expense	17,155		17,155
Shares Redeemed to Settle Employee Taxes	(6,108)		(6,108)
Purchase and Retirement of Common Stock	(388,455)	(31)	(16,463)	(371,961)
Dividends to Stockholders	(37,040)			(37,040)
Unfunded Pension Liability, net of tax	(372)				(372)
Ending Balance at Mar. 31, 2023	1,185,694	358		1,188,883	(3,547)
Net Income (Loss)	477,639			477,639
Stock Option Exercises and Restricted Share Vesting	17,098	2	17,096
Stock Compensation Expense	19,900		19,900
Shares Redeemed to Settle Employee Taxes	(10,423)	(1)	(10,422)
Purchase and Retirement of Common Stock	(346,706)	(18)	(26,574)	(320,114)
Dividends to Stockholders	(34,841)			(34,841)
Unfunded Pension Liability, net of tax	174				174
Ending Balance at Mar. 31, 2024	1,308,535	341		1,311,567	(3,373)
Net Income (Loss)	463,416			463,416
Stock Option Exercises and Restricted Share Vesting	6,380	1	6,379
Stock Compensation Expense	18,743		18,743
Shares Redeemed to Settle Employee Taxes	(5,898)		(5,898)
Purchase and Retirement of Common Stock	(301,268)	(12)	(19,224)	(282,032)
Dividends to Stockholders	(33,456)			(33,456)
Unfunded Pension Liability, net of tax	248				248
Ending Balance at Mar. 31, 2025	$ 1,456,700	$ 330	$ 0	$ 1,459,495	$ (3,125)