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		157,054,000
Beginning balance at Mar. 31, 2023	$ 1,765,733	$ 1,571	$ 230,841	$ 1,572,356	$ (39,035)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		4,000
Stock-based compensation	6,877		6,877
Shares issued upon vesting (in shares)		16,000
Exercise of stock options (in shares)		47,000
Exercise of stock options	548		548
Shares withheld for taxes	(698)		(698)
Repurchases of common stock (Note 8) (in shares)		(314,000)
Repurchases of common stock (Note 8)	(25,469)	$ (3)		(25,466)
Excise taxes related to repurchases of common stock	(123)			(123)
Net income	63,552			63,552
Total other comprehensive (loss) income	(8,299)				(8,299)
Ending balance (in shares) at Jun. 30, 2023		156,807,000
Ending balance at Jun. 30, 2023	1,802,121	$ 1,568	237,568	1,610,319	(47,334)
Beginning balance (in shares) at Mar. 31, 2023		157,054,000
Beginning balance at Mar. 31, 2023	$ 1,765,733	$ 1,571	230,841	1,572,356	(39,035)
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock (Note 8) (in shares)	(3,573,960)
Repurchases of common stock (Note 8)	$ (310,635)
Net income	632,018
Total other comprehensive (loss) income	(3,339)
Ending balance (in shares) at Dec. 31, 2023		153,892,000
Ending balance at Dec. 31, 2023	2,104,190	$ 1,539	253,899	1,891,126	(42,374)
Beginning balance (in shares) at Jun. 30, 2023		156,807,000
Beginning balance at Jun. 30, 2023	1,802,121	$ 1,568	237,568	1,610,319	(47,334)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		3,000
Stock-based compensation	9,802		9,802
Shares issued upon vesting (in shares)		144,000
Shares issued upon vesting	1,165	$ 1	1,164
Exercise of stock options (in shares)		46,000
Exercise of stock options	533		533
Shares withheld for taxes	(7,759)		(7,759)
Repurchases of common stock (Note 8) (in shares)		(2,082,000)
Repurchases of common stock (Note 8)	(185,469)	$ (21)		(185,448)
Excise taxes related to repurchases of common stock	(1,693)			(1,693)
Net income	178,547			178,547
Total other comprehensive (loss) income	(2,117)				(2,117)
Ending balance (in shares) at Sep. 30, 2023		154,918,000
Ending balance at Sep. 30, 2023	1,795,130	$ 1,548	241,308	1,601,725	(49,451)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		3,000
Stock-based compensation	11,846	$ 1	11,845
Shares issued upon vesting (in shares)		14,000
Exercise of stock options (in shares)		135,000
Exercise of stock options	1,444	$ 2	1,442
Shares withheld for taxes	(696)		(696)
Repurchases of common stock (Note 8) (in shares)		(1,178,000)
Repurchases of common stock (Note 8)	(99,697)	$ (12)		(99,685)
Excise taxes related to repurchases of common stock	(833)			(833)
Net income	389,919			389,919
Total other comprehensive (loss) income	7,077				7,077
Ending balance (in shares) at Dec. 31, 2023		153,892,000
Ending balance at Dec. 31, 2023	$ 2,104,190	$ 1,539	253,899	1,891,126	(42,374)
Beginning balance (in shares) at Mar. 31, 2024	153,554,000	153,554,000
Beginning balance at Mar. 31, 2024	$ 2,107,468	$ 1,536	243,050	1,913,615	(50,733)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		2,000
Stock-based compensation	8,231		8,231
Shares issued upon vesting (in shares)		6,000
Exercise of stock options (in shares)		54,000
Exercise of stock options	601	$ 1	600
Shares withheld for taxes	(495)		(495)
Repurchases of common stock (Note 8) (in shares)		(1,062,000)
Repurchases of common stock (Note 8)	(151,967)	$ (11)		(151,956)
Excise taxes related to repurchases of common stock	(1,181)			(1,181)
Net income	115,625			115,625
Total other comprehensive (loss) income	(3,800)				(3,800)
Ending balance (in shares) at Jun. 30, 2024		152,554,000
Ending balance at Jun. 30, 2024	$ 2,074,482	$ 1,526	251,386	1,876,103	(54,533)
Beginning balance (in shares) at Mar. 31, 2024	153,554,000	153,554,000
Beginning balance at Mar. 31, 2024	$ 2,107,468	$ 1,536	243,050	1,913,615	(50,733)
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock (Note 8) (in shares)	(2,022,299)
Repurchases of common stock (Note 8)	$ (301,011)
Net income	814,680
Total other comprehensive (loss) income	$ (4,711)
Ending balance (in shares) at Dec. 31, 2024	151,770,000	151,770,000
Ending balance at Dec. 31, 2024	$ 2,630,919	$ 1,518	259,947	2,424,898	(55,444)
Beginning balance (in shares) at Jun. 30, 2024		152,554,000
Beginning balance at Jun. 30, 2024	2,074,482	$ 1,526	251,386	1,876,103	(54,533)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		2,000
Stock-based compensation	11,657		11,657
Shares issued upon vesting (in shares)		129,000
Shares issued upon vesting	1,638	$ 1	1,637
Exercise of stock options (in shares)		9,000
Exercise of stock options	93		93
Shares withheld for taxes	(12,561)		(12,561)
Repurchases of common stock (Note 8) (in shares)		(686,000)
Repurchases of common stock (Note 8)	(104,323)	$ (7)		(104,316)
Excise taxes related to repurchases of common stock	(843)			(843)
Net income	242,321			242,321
Total other comprehensive (loss) income	10,775				10,775
Ending balance (in shares) at Sep. 30, 2024		152,008,000
Ending balance at Sep. 30, 2024	2,223,239	$ 1,520	252,212	2,013,265	(43,758)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		2,000
Stock-based compensation	8,653		8,653
Shares issued upon vesting (in shares)		8,000
Exercise of stock options (in shares)		27,000
Exercise of stock options	274		274
Shares withheld for taxes	(1,192)		(1,192)
Repurchases of common stock (Note 8) (in shares)		(275,000)
Repurchases of common stock (Note 8)	(44,721)	$ (2)		(44,719)
Excise taxes related to repurchases of common stock	(382)			(382)
Net income	456,734			456,734
Total other comprehensive (loss) income	$ (11,686)				(11,686)
Ending balance (in shares) at Dec. 31, 2024	151,770,000	151,770,000
Ending balance at Dec. 31, 2024	$ 2,630,919	$ 1,518	$ 259,947	$ 2,424,898	$ (55,444)