Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock Voting	Additional Paid In Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Retained Earnings
Beginning balance, common stock (in shares) at Mar. 31, 2021		124,197,974
Beginning balance at Mar. 31, 2021	$ 2,005,779	$ 124	$ 2,955,400	$ (1,940)	$ (1,322,496)	$ 374,691
Beginning balance, treasury stock (in shares) at Mar. 31, 2021					50,446,359
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,445)					(3,445)
Unrealized net investment losses	(5)			(5)
Unrealized net gain (loss) on derivative financial instruments	47			47
Cumulative translation adjustments	(33)			(33)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,659,576
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	29,414		29,414
Issuance of common stock under employee stock purchase plan (in shares)		251,308
Issuance of common stock under employee stock purchase plan	6,890		6,890
Repurchase of treasury stock (in shares)					1,444,838
Repurchase of treasury stock	(39,645)				$ (39,645)
Ending balance, common stock (in shares) at Sep. 30, 2021		126,108,858
Ending balance at Sep. 30, 2021	1,999,004	$ 126	2,991,704	(1,931)	$ (1,362,141)	371,246
Ending balance, treasury stock (in shares) at Sep. 30, 2021					51,891,197
Beginning balance, common stock (in shares) at Jun. 30, 2021		124,694,737
Beginning balance at Jun. 30, 2021	2,002,955	$ 124	2,968,631	(1,877)	$ (1,327,273)	363,350
Beginning balance, treasury stock (in shares) at Jun. 30, 2021					50,610,492
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	7,896					7,896
Unrealized net investment losses	0
Unrealized net gain (loss) on derivative financial instruments	(2)			(2)
Cumulative translation adjustments	(52)			(52)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,162,813
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	16,183		16,183
Issuance of common stock under employee stock purchase plan (in shares)		251,308
Issuance of common stock under employee stock purchase plan	6,890		6,890
Repurchase of treasury stock (in shares)					1,280,705
Repurchase of treasury stock	(34,868)				$ (34,868)
Ending balance, common stock (in shares) at Sep. 30, 2021		126,108,858
Ending balance at Sep. 30, 2021	$ 1,999,004	$ 126	2,991,704	(1,931)	$ (1,362,141)	371,246
Ending balance, treasury stock (in shares) at Sep. 30, 2021					51,891,197
Beginning balance, common stock (in shares) at Mar. 31, 2022	74,102,293	126,425,383
Beginning balance at Mar. 31, 2022	$ 2,060,395	$ 126	3,023,403	141	$ (1,373,840)	410,565
Beginning balance, treasury stock (in shares) at Mar. 31, 2022	52,323,090				52,323,090
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 10,251					10,251
Unrealized net investment losses	(11)			(11)
Unrealized net gain (loss) on derivative financial instruments	(625)			(625)
Cumulative translation adjustments	(561)			(561)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,741,744
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	30,702		30,702
Issuance of common stock under employee stock purchase plan (in shares)		206,029
Issuance of common stock under employee stock purchase plan	6,539		6,539
Repurchase of treasury stock (in shares)					3,806,416
Repurchase of treasury stock	$ (169,046)		(45,000)		$ (124,046)
Ending balance, common stock (in shares) at Sep. 30, 2022	72,243,650	128,373,156
Ending balance at Sep. 30, 2022	$ 1,937,646	$ 128	3,015,644	(1,056)	$ (1,497,886)	420,816
Ending balance, treasury stock (in shares) at Sep. 30, 2022	56,129,506				56,129,506
Beginning balance, common stock (in shares) at Jun. 30, 2022		127,371,813
Beginning balance at Jun. 30, 2022	$ 1,906,889	$ 127	2,993,163	(147)	$ (1,489,687)	403,433
Beginning balance, treasury stock (in shares) at Jun. 30, 2022					55,887,992
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	17,383					17,383
Unrealized net investment losses	0
Unrealized net gain (loss) on derivative financial instruments	(599)			(599)
Cumulative translation adjustments	(310)			(310)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		795,314
Issuance of common stock pursuant to vesting of restricted stock units	1	$ 1
Stock-based compensation expense for restricted stock units granted to employees	15,942		15,942
Issuance of common stock under employee stock purchase plan (in shares)		206,029
Issuance of common stock under employee stock purchase plan	6,539		6,539
Repurchase of treasury stock (in shares)					241,514
Repurchase of treasury stock	$ (8,199)		0		$ (8,199)
Ending balance, common stock (in shares) at Sep. 30, 2022	72,243,650	128,373,156
Ending balance at Sep. 30, 2022	$ 1,937,646	$ 128	$ 3,015,644	$ (1,056)	$ (1,497,886)	$ 420,816
Ending balance, treasury stock (in shares) at Sep. 30, 2022	56,129,506				56,129,506