Consolidated Statements of Stockholders' Equity (unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Losses [Member]
Beginning balance at Mar. 31, 2021	$ 1,358,990	$ 424	$ 62,497	$ 1,299,509	$ (3,440)
Net Earnings	95,327			95,327
Stock Compensation Expense	2,456	1	2,455
Stock Option Exercises and Restricted Share Issuances	8,222		8,222
Shares Redeemed to Settle Employee Taxes	(1,214)		(1,214)
Purchase and Retirement of Common Stock	(61,929)	(4)	(61,925)
Dividends to Shareholders	(10,547)			(10,547)
Unfunded Pension Liability, net of tax	27				27
Ending Balance at Jun. 30, 2021	1,391,332	421	10,035	1,384,289	(3,413)
Beginning balance at Mar. 31, 2021	1,358,990	424	62,497	1,299,509	(3,440)
Net Earnings	197,452
Ending Balance at Sep. 30, 2021	1,307,309	409	0	1,310,286	(3,386)
Beginning balance at Jun. 30, 2021	1,391,332	421	10,035	1,384,289	(3,413)
Net Earnings	102,125			102,125
Stock Compensation Expense	3,920		3,920
Stock Option Exercises and Restricted Share Issuances	6,238		6,238
Shares Redeemed to Settle Employee Taxes	(145)		(145)
Purchase and Retirement of Common Stock	(185,916)	(12)	(20,048)	(165,856)
Dividends to Shareholders	(10,272)			(10,272)
Unfunded Pension Liability, net of tax	27				27
Ending Balance at Sep. 30, 2021	1,307,309	409	0	1,310,286	(3,386)
Beginning balance at Mar. 31, 2022	1,133,556	387	0	1,136,344	(3,175)
Net Earnings	105,005			105,005
Stock Compensation Expense	5,146		5,146
Stock Option Exercises and Restricted Share Issuances	667	1	666
Shares Redeemed to Settle Employee Taxes	(1,497)		(1,497)
Purchase and Retirement of Common Stock	(109,612)	(8)	(4,315)	(105,289)
Dividends to Shareholders	(9,507)			(9,507)
Unfunded Pension Liability, net of tax	23				23
Ending Balance at Jun. 30, 2022	1,123,781	380	0	1,126,553	(3,152)
Beginning balance at Mar. 31, 2022	1,133,556	387	0	1,136,344	(3,175)
Net Earnings	244,000
Ending Balance at Sep. 30, 2022	1,156,704	371	(0)	1,159,461	(3,128)
Beginning balance at Jun. 30, 2022	1,123,781	380	0	1,126,553	(3,152)
Net Earnings	138,995			138,995
Stock Compensation Expense	4,402		4,402
Stock Option Exercises and Restricted Share Issuances	68		68
Shares Redeemed to Settle Employee Taxes	(309)		(309)
Purchase and Retirement of Common Stock	(100,786)	(9)	(4,161)	(96,616)
Dividends to Shareholders	(9,471)			(9,471)
Unfunded Pension Liability, net of tax	24				24
Ending Balance at Sep. 30, 2022	$ 1,156,704	$ 371	$ (0)	$ 1,159,461	$ (3,128)