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, 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	$ 0	346,000	$ 0	0
Stock issued under employee stock purchase plan, shares		2,636		0
Stock issued under stock option plan, net of shares repurchased	3,702,000	$ 0	3,702,000	$ 0	0
Stock issued under stock option plan, net of shares repurchased, shares		81,854		0
Stock-based compensation expense	2,329,000		2,329,000	$ 0	0
Purchase of treasury stock	(52,286,000)	$ 0	0	$ (52,286,000)	0
Purchase of treasury stock, shares		0		(339,391)
Net income	31,347,000	$ 0	0	$ 0	31,347,000
Ending balance at Sep. 30, 2022	197,833,000	$ 3,000	207,986,000	$ (706,806,000)	696,650,000
Ending balance, shares at Sep. 30, 2022		54,873,202		(37,559,016)
Beginning balance at Jun. 30, 2022	205,628,000	$ 3,000	204,839,000	$ (681,208,000)	681,994,000
Beginning balance, shares at Jun. 30, 2022		54,832,358		(37,394,507)
Stock issued under employee stock purchase plan	346,000	$ 0	346,000	$ 0	0
Stock issued under employee stock purchase plan, shares		2,636		0
Stock issued under stock option plan, net of shares repurchased	1,851,000	$ 0	1,851,000	$ 0	0
Stock issued under stock option plan, net of shares repurchased, shares		38,208		0
Stock-based compensation expense	950,000	$ 0	950,000	$ 0	0
Purchase of treasury stock	(25,598,000)	$ 0	0	$ (25,598,000)	0
Purchase of treasury stock, shares		0		(164,509)
Net income	14,656,000	$ 0	0	$ 0	14,656,000
Ending balance at Sep. 30, 2022	197,833,000	$ 3,000	207,986,000	$ (706,806,000)	696,650,000
Ending balance, shares at Sep. 30, 2022		54,873,202		(37,559,016)
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	0	$ (27,205,000)	0
Purchase of treasury stock, shares		0		(133,493)
Net income	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	0	$ (9,418,000)	0
Purchase of treasury stock, shares	(45,501)	0		(45,501)
Net income	$ 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)