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 (in shares) at Mar. 31, 2019		119,760,132			(42,149,771)
Beginning balance at Mar. 31, 2019	$ 2,065,433	$ 120	$ 2,828,922	$ (2,639)	$ (1,119,063)	$ 358,093
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(2,754)					(2,754)
Unrealized net investment gains (losses)	126			126
Unrealized net losses on derivative financial instruments	(57)			(57)
Cumulative translation adjustments	(1,644)			(1,644)
Recognition of actuarial net gains (losses) from pension and other post-retirement plan	1,054			1,054
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,651,284
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	48,404		48,404
Issuance of common stock under employee stock purchase plan (in shares)		594,661
Issuance of common stock under employee stock purchase plan	14,227		14,227
Repurchase of treasury stock (in shares)					(7,635,400)
Repurchase of treasury stock	(186,872)				$ (186,872)
Ending balance (in shares) at Mar. 31, 2020		122,006,077			(49,785,171)
Ending balance at Mar. 31, 2020	1,937,919	$ 122	2,891,553	(3,160)	$ (1,305,935)	355,339
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	19,352					19,352
Unrealized net investment gains (losses)	(130)			(130)
Unrealized net losses on derivative financial instruments	(28)			(28)
Cumulative translation adjustments	2,926			2,926
Recognition of actuarial net gains (losses) from pension and other post-retirement plan	(1,548)			(1,548)
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,630,228
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	49,418		49,418
Issuance of common stock under employee stock purchase plan (in shares)		561,669
Issuance of common stock under employee stock purchase plan	14,429		14,429
Repurchase of treasury stock (in shares)					(661,188)
Repurchase of treasury stock	(16,561)				$ (16,561)
Ending balance (in shares) at Mar. 31, 2021		124,197,974			(50,446,359)
Ending balance at Mar. 31, 2021	2,005,779	$ 124	2,955,400	(1,940)	$ (1,322,496)	374,691
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	35,874					35,874
Unrealized net investment gains (losses)	(29)			(29)
Unrealized net losses on derivative financial instruments	20			20
Cumulative translation adjustments	153			153
Recognition of actuarial net gains (losses) from pension and other post-retirement plan	1,937			1,937
Issuance of common stock pursuant to vesting of restricted stock units (in shares)		1,728,994
Issuance of common stock pursuant to vesting of restricted stock units	2	$ 2
Stock-based compensation expense for restricted stock units granted to employees	53,421		53,421
Issuance of common stock under employee stock purchase plan (in shares)		498,415
Issuance of common stock under employee stock purchase plan	14,582		14,582
Repurchase of treasury stock (in shares)					(1,876,731)
Repurchase of treasury stock	(51,344)				$ (51,344)
Ending balance (in shares) at Mar. 31, 2022		126,425,383			(52,323,090)
Ending balance at Mar. 31, 2022	$ 2,060,395	$ 126	$ 3,023,403	$ 141	$ (1,373,840)	$ 410,565