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 loss	(11,341)					(11,341)
Unrealized net investment losses	(5)			(5)
Unrealized net gain (loss) on derivative financial instruments	49			49
Cumulative translation adjustments	19			19
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		496,763
Issuance of common stock pursuant to vesting of restricted stock units	0	$ 0
Stock-based compensation expense for restricted stock units granted to employees	13,231		13,231
Repurchase of treasury stock (in shares)					164,133
Repurchase of treasury stock	(4,777)				$ (4,777)
Ending balance, common stock (in shares) at Jun. 30, 2021		124,694,737
Ending balance at Jun. 30, 2021	$ 2,002,955	$ 124	2,968,631	(1,877)	$ (1,327,273)	363,350
Ending balance, treasury stock (in shares) at Jun. 30, 2021					50,610,492
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 loss	$ (7,132)					(7,132)
Unrealized net investment losses	(11)			(11)
Unrealized net gain (loss) on derivative financial instruments	(26)			(26)
Cumulative translation adjustments	(251)			(251)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		946,430
Issuance of common stock pursuant to vesting of restricted stock units	1	$ 1
Stock-based compensation expense for restricted stock units granted to employees	14,760		14,760
Repurchase of treasury stock (in shares)					3,564,902
Repurchase of treasury stock	$ (160,847)		(45,000)		$ (115,847)
Ending balance, common stock (in shares) at Jun. 30, 2022	71,483,821	127,371,813
Ending balance at Jun. 30, 2022	$ 1,906,889	$ 127	$ 2,993,163	$ (147)	$ (1,489,687)	$ 403,433
Ending balance, treasury stock (in shares) at Jun. 30, 2022	55,887,992				55,887,992