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, 2023	$ 202,176,000	$ 3,000	$ 218,700,000	$ (748,195,000)	$ 731,668,000
Beginning balance, shares at Mar. 31, 2023		54,987,366		(37,817,866)
Stock issued under employee stock purchase plan	336,000	$ 0	336,000	$ 0	0
Stock issued under employee stock purchase plan, shares		1,797		0
Stock issued under stock option plan, net of shares repurchased	4,946,000	$ 0	4,946,000	$ 0	0
Stock issued under stock option plan, net of shares repurchased, shares		81,679		0
Stock-based compensation expense	2,613,000	$ 0	2,613,000	$ 0	0
Purchase of treasury stock	(27,205,000)		0	$ (27,205,000)	0
Purchase of treasury stock, shares		0		(133,493)
Net Income (Loss)	39,703,000	$ 0	0	$ 0	39,703,000
Ending balance at Sep. 30, 2023	222,569,000	$ 3,000	226,595,000	$ (775,400,000)	771,371,000
Ending balance, shares at Sep. 30, 2023		55,070,842		(37,951,359)
Beginning balance at Jun. 30, 2023	206,980,000	$ 3,000	221,486,000	$ (765,982,000)	751,473,000
Beginning balance, shares at Jun. 30, 2023		55,019,773		(37,905,858)
Stock issued under employee stock purchase plan	336,000	$ 0	336,000	$ 0	0
Stock issued under employee stock purchase plan, shares		1,797		0
Stock issued under stock option plan, net of shares repurchased	3,472,000	$ 0	3,472,000	$ 0	0
Stock issued under stock option plan, net of shares repurchased, shares		49,272		0
Stock-based compensation expense	1,301,000	$ 0	1,301,000	$ 0	0
Purchase of treasury stock	(9,418,000)		0	$ (9,418,000)	0
Purchase of treasury stock, shares		0		(45,501)
Net Income (Loss)	19,898,000	$ 0	0	$ 0	19,898,000
Ending balance at Sep. 30, 2023	222,569,000	$ 3,000	226,595,000	$ (775,400,000)	771,371,000
Ending balance, shares at Sep. 30, 2023		55,070,842		(37,951,359)
Beginning balance at Mar. 31, 2024	247,647,000	$ 3,000	233,629,000	$ (793,905,000)	807,920,000
Beginning balance, shares at Mar. 31, 2024		55,162,075		(38,033,179)
Stock issued under employee stock purchase plan	342,000	$ 0	342,000	$ 0	0
Stock issued under employee stock purchase plan, shares		1,102		0
Stock issued under stock option plan, net of shares repurchased	6,371,000	$ 0	6,371,000	$ 0	0
Stock issued under stock option plan, net of shares repurchased, shares		75,423		0
Stock-based compensation expense	2,552,000	$ 0	2,552,000	$ 0	0
Purchase of treasury stock	$ (19,115,000)		0	$ (19,115,000)	0
Purchase of treasury stock, shares	(70,261)	0		(70,261)
Net Income (Loss)	$ 44,975,000	$ 0	0	$ 0	44,975,000
Ending balance at Sep. 30, 2024	282,772,000	$ 3,000	242,894,000	$ (813,020,000)	852,895,000
Ending balance, shares at Sep. 30, 2024		55,238,600		(38,103,440)
Beginning balance at Jun. 30, 2024	263,873,000	$ 3,000	237,804,000	$ (803,431,000)	829,497,000
Beginning balance, shares at Jun. 30, 2024		55,194,878		(38,071,317)
Stock issued under employee stock purchase plan	342,000	$ 0	342,000	$ 0	0
Stock issued under employee stock purchase plan, shares		1,102		0
Stock issued under stock option plan, net of shares repurchased	3,266,000	$ 0	3,266,000	$ 0	0
Stock issued under stock option plan, net of shares repurchased, shares		42,620		0
Stock-based compensation expense	1,482,000	$ 0	1,482,000	$ 0	0
Purchase of treasury stock	$ (9,589,000)	$ (9,600,000)	0	$ (9,589,000)	0
Purchase of treasury stock, shares	(32,123)	0		(32,123)
Net Income (Loss)	$ 23,398,000	$ 0	0	$ 0	23,398,000
Ending balance at Sep. 30, 2024	$ 282,772,000	$ 3,000	$ 242,894,000	$ (813,020,000)	$ 852,895,000
Ending balance, shares at Sep. 30, 2024		55,238,600		(38,103,440)