CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (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)		12,000
Stock-based compensation	37,248		37,248
Shares issued upon vesting (in shares)		351,000
Shares issued upon vesting	2,444	$ 4	2,440
Exercise of stock options (in shares)		426,000
Exercise of stock options	4,786	$ 4	4,782
Shares withheld for taxes	$ (32,261)		(32,261)
Repurchases of common stock (Note 11) (in shares)	(4,289,124)	(4,289,000)
Repurchases of common stock (Note 11)	$ (414,931)	$ (43)		(414,888)
Excise taxes related to repurchases of common stock	(3,416)			(3,416)
Net income	759,563			759,563
Total other comprehensive (loss) income	(11,698)				(11,698)
Ending balance (in shares) at Mar. 31, 2024		153,554,000
Ending 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)		11,000
Stock-based compensation	37,915		37,915
Shares issued upon vesting (in shares)		347,000
Shares issued upon vesting	3,804	$ 3	3,801
Exercise of stock options (in shares)		89,000
Exercise of stock options	968	$ 1	967
Shares withheld for taxes	$ (32,267)		(32,267)
Repurchases of common stock (Note 11) (in shares)	(3,800,040)	(3,800,000)
Repurchases of common stock (Note 11)	$ (567,002)	$ (38)		(566,964)
Excise taxes related to repurchases of common stock	(5,043)			(5,043)
Net income	966,091			966,091
Total other comprehensive (loss) income	$ 1,079				1,079
Ending balance (in shares) at Mar. 31, 2025	150,201,000	150,201,000
Ending balance at Mar. 31, 2025	$ 2,513,013	$ 1,502	253,466	2,307,699	(49,654)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		16,000
Stock-based compensation	44,835		44,835
Shares issued upon vesting (in shares)		257,000
Shares issued upon vesting	4,509	$ 3	4,506
Shares withheld for taxes	$ (15,012)		(15,012)
Repurchases of common stock (Note 11) (in shares)	(10,496,292)	(10,496,000)
Repurchases of common stock (Note 11)	$ (1,075,100)	$ (105)		(1,074,995)
Excise taxes related to repurchases of common stock	(10,413)			(10,413)
Net income	1,024,071			1,024,071
Total other comprehensive (loss) income	$ 13,735				13,735
Ending balance (in shares) at Mar. 31, 2026	139,978,000	139,978,000
Ending balance at Mar. 31, 2026	$ 2,499,638	$ 1,400	$ 287,795	$ 2,246,362	$ (35,919)