CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Mar. 31, 2023		26,176,000
Beginning balance at Mar. 31, 2023	$ 1,765,733	$ 262	$ 232,932	$ 1,571,574	$ (39,035)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		1,000
Stock-based compensation	6,877		6,877
Shares issued upon vesting (in shares)		3,000
Exercise of stock options (in shares)		8,000
Exercise of stock options	548		548
Shares withheld for taxes	$ (698)		(698)
Repurchases of common stock (Note 7) (in shares)	(52,410)	(52,000)
Repurchases of common stock (Note 7)	$ (25,469)	$ (1)		(25,468)
Excise taxes related to repurchases of common stock	(123)			(123)
Net income	63,552			63,552
Total other comprehensive loss	(8,299)				(8,299)
Ending balance (in shares) at Jun. 30, 2023		26,136,000
Ending balance at Jun. 30, 2023	$ 1,802,121	$ 261	239,659	1,609,535	(47,334)
Beginning balance (in shares) at Mar. 31, 2024	25,593,000	25,593,000
Beginning balance at Mar. 31, 2024	$ 2,107,468	$ 255	245,149	1,912,797	(50,733)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	8,231		8,231
Shares issued upon vesting (in shares)		1,000
Exercise of stock options (in shares)		9,000
Exercise of stock options	601		601
Shares withheld for taxes	$ (495)		(495)
Repurchases of common stock (Note 7) (in shares)	(176,956)	(177,000)
Repurchases of common stock (Note 7)	$ (151,967)	$ (1)		(151,966)
Excise taxes related to repurchases of common stock	(1,181)			(1,181)
Net income	115,625			115,625
Total other comprehensive loss	$ (3,800)				(3,800)
Ending balance (in shares) at Jun. 30, 2024	25,426,000	25,426,000
Ending balance at Jun. 30, 2024	$ 2,074,482	$ 254	$ 253,486	$ 1,875,275	$ (54,533)