Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Voting	Additional Paid In Capital	Accumulated Other Comprehensive Income (loss)	Treasury Stock	(Accumulated Deficit) Retained Earnings
Beginning balance, common stock (in shares) at Mar. 31, 2023		128,683,824
Beginning balance at Mar. 31, 2023	$ 2,029,649	$ 128	$ 3,099,698	$ 5,738	$ (1,546,128)	$ 470,213
Beginning balance, treasury stock (in shares) at Mar. 31, 2023					57,434,779
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	17,262					17,262
Unrealized net investment gains (losses)	(97)			(97)
Unrealized net gains (losses) on derivative financial instruments	(192)			(192)
Cumulative translation adjustments	(70)			(70)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,981,783
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	37,008		37,008
Issuance of common stock under employee stock purchase plan (in shares)		209,791
Issuance of common stock under employee stock purchase plan	6,006		6,006
Repurchase of treasury stock (in shares)					1,742,718
Repurchase of treasury stock	(49,898)				$ (49,898)
Ending balance, common stock (in shares) at Sep. 30, 2023		130,875,398
Ending balance at Sep. 30, 2023	2,039,670	$ 130	3,142,712	5,379	$ (1,596,026)	487,475
Ending balance, treasury stock (in shares) at Sep. 30, 2023					59,177,497
Beginning balance, common stock (in shares) at Jun. 30, 2023		130,016,041
Beginning balance at Jun. 30, 2023	2,031,210	$ 130	3,118,798	5,803	$ (1,559,534)	466,013
Beginning balance, treasury stock (in shares) at Jun. 30, 2023					57,869,951
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	21,462					21,462
Unrealized net investment gains (losses)	9			9
Unrealized net gains (losses) on derivative financial instruments	(295)			(295)
Cumulative translation adjustments	(138)			(138)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		649,566
Stock-based compensation expense for restricted stock units granted to employees	17,908		17,908
Issuance of common stock under employee stock purchase plan (in shares)		209,791
Issuance of common stock under employee stock purchase plan	6,006		6,006
Repurchase of treasury stock (in shares)					1,307,546
Repurchase of treasury stock	(36,492)				$ (36,492)
Ending balance, common stock (in shares) at Sep. 30, 2023		130,875,398
Ending balance at Sep. 30, 2023	$ 2,039,670	$ 130	3,142,712	5,379	$ (1,596,026)	487,475
Ending balance, treasury stock (in shares) at Sep. 30, 2023					59,177,497
Ending balance, common stock (in shares) at Sep. 30, 2024	71,715,229	133,671,490
Ending balance at Sep. 30, 2024	$ 1,459,388	$ 133	3,221,213	4,151	$ (1,654,239)	(111,870)
Ending balance, treasury stock (in shares) at Sep. 30, 2024	61,956,261				61,956,261
Beginning balance, common stock (in shares) at Mar. 31, 2024	71,404,216	131,316,309
Beginning balance at Mar. 31, 2024	$ 1,892,065	$ 131	3,181,366	3,572	$ (1,615,483)	322,479
Beginning balance, treasury stock (in shares) at Mar. 31, 2024	59,912,093				59,912,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	$ (434,349)					(434,349)
Unrealized net investment gains (losses)	28			28
Unrealized net gains (losses) on derivative financial instruments	154			154
Cumulative translation adjustments	397			397
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		2,142,083
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	35,270		35,270
Issuance of common stock under employee stock purchase plan (in shares)		213,098
Issuance of common stock under employee stock purchase plan	4,577		4,577
Repurchase of treasury stock (in shares)					2,044,168
Repurchase of treasury stock	$ (38,756)				$ (38,756)
Ending balance, common stock (in shares) at Sep. 30, 2024	71,715,229	133,671,490
Ending balance at Sep. 30, 2024	$ 1,459,388	$ 133	3,221,213	4,151	$ (1,654,239)	(111,870)
Ending balance, treasury stock (in shares) at Sep. 30, 2024	61,956,261				61,956,261
Beginning balance, common stock (in shares) at Jun. 30, 2024		133,189,228
Beginning balance at Jun. 30, 2024	$ 1,431,996	$ 133	3,201,998	3,404	$ (1,652,642)	(120,897)
Beginning balance, treasury stock (in shares) at Jun. 30, 2024					61,877,819
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	9,027					9,027
Unrealized net investment gains (losses)	21			21
Unrealized net gains (losses) on derivative financial instruments	198			198
Cumulative translation adjustments	528			528
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		269,164
Stock-based compensation expense for restricted stock units granted to employees	14,638		14,638
Issuance of common stock under employee stock purchase plan (in shares)		213,098
Issuance of common stock under employee stock purchase plan	4,577		4,577
Repurchase of treasury stock (in shares)					78,442
Repurchase of treasury stock	$ (1,597)				$ (1,597)
Ending balance, common stock (in shares) at Sep. 30, 2024	71,715,229	133,671,490
Ending balance at Sep. 30, 2024	$ 1,459,388	$ 133	$ 3,221,213	$ 4,151	$ (1,654,239)	$ (111,870)
Ending balance, treasury stock (in shares) at Sep. 30, 2024	61,956,261				61,956,261