Consolidated Statements of Stockholders' Equity - (Unaudited) - USD ($)	Total	Common Stock [Member]	Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]
Beginning balance at Mar. 31, 2021	$ 220,402,000	$ 3,000	$ 185,941,000	$ (564,435,000)	$ 598,893,000
Beginning balance, shares at Mar. 31, 2021		54,529,642		(36,653,552)
Stock issued under employee stock purchase plan	271,000		271,000
Stock issued under employee stock purchase plan, shares		1,534
Stock issued under stock option plan, net of shares repurchased	8,888,000		8,888,000
Stock issued under stock option plan, net of shares repurchased, shares		196,217
Stock-based compensation expense	3,884,000		3,884,000
Purchase of treasury stock	(65,291,000)			$ (65,291,000)
Purchase of treasury stock, shares				(420,082)
Net income	46,773,000				46,773,000
Ending balance at Dec. 31, 2021	214,927,000	$ 3,000	198,984,000	$ (629,726,000)	645,666,000
Ending balance, shares at Dec. 31, 2021		54,727,393		(37,073,634)
Beginning balance at Sep. 30, 2021	223,795,000	$ 3,000	196,174,000	$ (604,190,000)	631,808,000
Beginning balance, shares at Sep. 30, 2021		54,701,476		(36,937,900)
Stock issued under stock option plan, net of shares repurchased	1,627,000		1,627,000
Stock issued under stock option plan, net of shares repurchased, shares		25,917
Stock-based compensation expense	1,183,000		1,183,000
Purchase of treasury stock	(25,536,000)			$ (25,536,000)
Purchase of treasury stock, shares				(135,734)
Net income	13,858,000				13,858,000
Ending balance at Dec. 31, 2021	214,927,000	$ 3,000	198,984,000	$ (629,726,000)	645,666,000
Ending balance, shares at Dec. 31, 2021		54,727,393		(37,073,634)
Beginning balance at Mar. 31, 2022	212,395,000	$ 3,000	201,609,000	$ (654,520,000)	665,303,000
Beginning balance, shares at Mar. 31, 2022		54,788,712		(37,219,625)
Stock issued under employee stock purchase plan	346,000		346,000
Stock issued under employee stock purchase plan, shares		2,636
Stock issued under stock option plan, net of shares repurchased	4,922,000		4,922,000
Stock issued under stock option plan, net of shares repurchased, shares		99,950
Stock-based compensation expense	4,027,000		4,027,000
Purchase of treasury stock	$ (75,081,000)			$ (75,081,000)
Purchase of treasury stock, shares	(491,493)			(491,493)
Net income	$ 48,196,000				48,196,000
Ending balance at Dec. 31, 2022	194,805,000	$ 3,000	210,904,000	$ (729,601,000)	713,499,000
Ending balance, shares at Dec. 31, 2022		54,891,298		(37,711,118)
Beginning balance at Sep. 30, 2022	197,833,000	$ 3,000	207,986,000	$ (706,806,000)	696,650,000
Beginning balance, shares at Sep. 30, 2022		54,873,202		(37,559,016)
Stock issued under stock option plan, net of shares repurchased	1,220,000		1,220,000
Stock issued under stock option plan, net of shares repurchased, shares		18,096
Stock-based compensation expense	1,698,000		1,698,000
Purchase of treasury stock	$ (22,795,000)			$ (22,795,000)
Purchase of treasury stock, shares	(152,102)			(152,102)
Net income	$ 16,849,000				16,849,000
Ending balance at Dec. 31, 2022	$ 194,805,000	$ 3,000	$ 210,904,000	$ (729,601,000)	$ 713,499,000
Ending balance, shares at Dec. 31, 2022		54,891,298		(37,711,118)