Consolidated Statements of Stockholders' Equity - 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	564,000	$ 0	564,000	$ 0	0
Stock issued under employee stock purchase plan, shares		3,363
Stock issued under stock option plan, net of shares repurchased	9,906,000	$ 0	9,906,000	0	0
Stock issued under stock option plan, net of shares repurchased, shares		255,707
Stock-based compensation expense	5,198,000	$ 0	5,198,000	0	0
Purchase of treasury stock	$ (90,085,000)	$ 0	0	$ (90,085,000)	0
Purchase of treasury stock, shares	(566,073)	0		(566,073)
Net Income (Loss)	$ 66,410,000	$ 0	0	$ 0	66,410,000
Ending balance at Mar. 31, 2022	212,395,000	$ 3,000	201,609,000	$ (654,520,000)	665,303,000
Ending balance, shares at Mar. 31, 2022		54,788,712		(37,219,625)
Stock issued under employee stock purchase plan	676,000	$ 0	676,000	$ 0	0
Stock issued under employee stock purchase plan, shares		4,457
Stock issued under stock option plan, net of shares repurchased	10,856,000	$ 0	10,856,000	0	0
Stock issued under stock option plan, net of shares repurchased, shares		194,197
Stock-based compensation expense	5,559,000	$ 0	5,559,000	0	0
Purchase of treasury stock	$ (93,675,000)	$ 0	0	$ (93,675,000)	0
Purchase of treasury stock, shares	(598,241)	0		(598,241)
Net Income (Loss)	$ 66,365,000	$ 0	0	$ 0	66,365,000
Ending balance at Mar. 31, 2023	202,176,000	$ 3,000	218,700,000	$ (748,195,000)	731,668,000
Ending balance, shares at Mar. 31, 2023		54,987,366		(37,817,866)
Stock issued under employee stock purchase plan	$ 681,000	$ 0	681,000	$ 0	0
Stock issued under employee stock purchase plan, shares	2,503,570	3,178
Stock issued under stock option plan, net of shares repurchased	$ 9,266,000	$ 0	9,266,000	0	0
Stock issued under stock option plan, net of shares repurchased, shares		171,531
Stock-based compensation expense	4,982,000	$ 0	4,982,000	0	0
Purchase of treasury stock	$ (45,710,000)	$ 0	0	$ (45,710,000)	0
Purchase of treasury stock, shares	(215,313)	0		(215,313)
Net Income (Loss)	$ 76,252,000	$ 0	0	$ 0	76,252,000
Ending balance at Mar. 31, 2024	$ 247,647,000	$ 3,000	$ 233,629,000	$ (793,905,000)	$ 807,920,000
Ending balance, shares at Mar. 31, 2024		55,162,075		(38,033,179)