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, 2021		27,910,000
Beginning balance at Mar. 31, 2021	$ 1,444,225	$ 279	$ 203,310	$ 1,257,379	$ (16,743)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		1,000
Stock-based compensation	5,469		5,469
Exercise of stock options (in shares)		1,000
Exercise of stock options	69		69
Shares withheld for taxes	(85)		(85)
Repurchases of common stock (Note 9) (in shares)		(249,000)
Repurchases of common stock (Note 9)	(82,166)	$ (2)		(82,164)
Net income	48,124			48,124
Total other comprehensive (loss) income	3,351				3,351
Ending balance (in shares) at Jun. 30, 2021		27,663,000
Ending balance at Jun. 30, 2021	1,418,987	$ 277	208,763	1,223,339	(13,392)
Beginning balance (in shares) at Mar. 31, 2021		27,910,000
Beginning balance at Mar. 31, 2021	$ 1,444,225	$ 279	203,310	1,257,379	(16,743)
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock (Note 9) (in shares)	(735,976)
Repurchases of common stock (Note 9)	$ (266,684)
Net income	383,130
Total other comprehensive (loss) income	(2,414)
Ending balance (in shares) at Dec. 31, 2021		27,243,000
Ending balance at Dec. 31, 2021	1,564,742	$ 272	209,795	1,373,832	(19,157)
Beginning balance (in shares) at Jun. 30, 2021		27,663,000
Beginning balance at Jun. 30, 2021	1,418,987	$ 277	208,763	1,223,339	(13,392)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		1,000
Stock-based compensation	6,288		6,288
Shares issued upon vesting (in shares)		36,000
Shares issued upon vesting	914		914
Shares withheld for taxes	(9,195)		(9,195)
Repurchases of common stock (Note 9) (in shares)		(133,000)
Repurchases of common stock (Note 9)	(53,807)	$ (1)		(53,806)
Net income	102,063			102,063
Total other comprehensive (loss) income	(1,504)				(1,504)
Ending balance (in shares) at Sep. 30, 2021		27,567,000
Ending balance at Sep. 30, 2021	1,463,746	$ 276	206,770	1,271,596	(14,896)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	6,386		6,386
Shares issued upon vesting (in shares)		2,000
Exercise of stock options (in shares)		28,000
Exercise of stock options	1,135		1,135
Shares withheld for taxes	(4,496)		(4,496)
Repurchases of common stock (Note 9) (in shares)		(354,000)
Repurchases of common stock (Note 9)	(130,711)	$ (4)		(130,707)
Net income	232,943			232,943
Total other comprehensive (loss) income	(4,261)				(4,261)
Ending balance (in shares) at Dec. 31, 2021		27,243,000
Ending balance at Dec. 31, 2021	1,564,742	$ 272	209,795	1,373,832	(19,157)
Beginning balance (in shares) at Mar. 31, 2022		26,982,000
Beginning balance at Mar. 31, 2022	1,538,825	$ 270	210,825	1,352,685	(24,955)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		1,000
Stock-based compensation	3,735		3,735
Shares withheld for taxes	(43)		(43)
Repurchases of common stock (Note 9) (in shares)		(384,000)
Repurchases of common stock (Note 9)	(99,993)	$ (4)		(99,989)
Net income	44,849			44,849
Total other comprehensive (loss) income	(14,966)				(14,966)
Ending balance (in shares) at Jun. 30, 2022		26,599,000
Ending balance at Jun. 30, 2022	1,472,407	$ 266	214,517	1,297,545	(39,921)
Beginning balance (in shares) at Mar. 31, 2022		26,982,000
Beginning balance at Mar. 31, 2022	$ 1,538,825	$ 270	210,825	1,352,685	(24,955)
Increase (Decrease) in Stockholders' Equity
Repurchases of common stock (Note 9) (in shares)	(685,075)
Repurchases of common stock (Note 9)	$ (194,862)
Net income	425,035
Total other comprehensive (loss) income	(15,321)
Ending balance (in shares) at Dec. 31, 2022		26,358,000
Ending balance at Dec. 31, 2022	1,769,172	$ 264	226,320	1,582,864	(40,276)
Beginning balance (in shares) at Jun. 30, 2022		26,599,000
Beginning balance at Jun. 30, 2022	1,472,407	$ 266	214,517	1,297,545	(39,921)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		1,000
Stock-based compensation	6,779		6,779
Shares issued upon vesting (in shares)		27,000
Shares issued upon vesting	1,046		1,046
Exercise of stock options (in shares)		27,000
Exercise of stock options	1,830		1,830
Shares withheld for taxes	(5,059)		(5,059)
Repurchases of common stock (Note 9) (in shares)		(173,000)
Repurchases of common stock (Note 9)	(50,247)	$ (1)		(50,246)
Net income	101,524			101,524
Total other comprehensive (loss) income	(12,441)				(12,441)
Ending balance (in shares) at Sep. 30, 2022		26,481,000
Ending balance at Sep. 30, 2022	1,515,839	$ 265	219,113	1,348,823	(52,362)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation (in shares)		1,000
Stock-based compensation	7,479		7,479
Shares issued upon vesting (in shares)		2,000
Exercise of stock options (in shares)		1,000
Exercise of stock options	40		40
Shares withheld for taxes	(312)		(312)
Repurchases of common stock (Note 9) (in shares)		(127,000)
Repurchases of common stock (Note 9)	(44,622)	$ (1)		(44,621)
Net income	278,662			278,662
Total other comprehensive (loss) income	12,086				12,086
Ending balance (in shares) at Dec. 31, 2022		26,358,000
Ending balance at Dec. 31, 2022	$ 1,769,172	$ 264	$ 226,320	$ 1,582,864	$ (40,276)