Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income (loss)	$ (366,922)	$ (147,734)	$ 59,648
Adjustments to reconcile net income (loss) to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	63,786	74,986	85,918
Loss on extinguishment of debt	1,134	0	0
Operating lease right-of-use assets	10,405	10,533	10,598
Gain on divestiture of a business	0	(3,806)	0
Loss on disposal of fixed assets	15	303	49
Share-based compensation expense associated with equity awards	64,785	70,799	61,986
Change in fair value of derivative instrument	0	(206)	1,380
Goodwill impairment	426,967	217,260	0
Deferred income taxes	(37,567)	(45,949)	(54,032)
Other gains	(402)	(5,451)	(1)
Changes in assets and liabilities
Accounts receivable and unbilled costs	28,664	(48,376)	4,897
Inventories	128	609	9,007
Prepaid expenses and other assets	(2,284)	(5,835)	5,039
Accounts payable	3,240	(1,861)	(5,549)
Accrued compensation and other expenses	20,529	(33,704)	12,071
Operating lease liabilities	(12,214)	(11,952)	(11,927)
Income taxes payable	83	(3,620)	165
Deferred revenue	17,323	(7,185)	(22,599)
Net cash provided by operating activities	217,670	58,811	156,650
Cash flows from investing activities:
Purchase of marketable securities and investments	(45,061)	(52,774)	(114,513)
Proceeds from maturity of marketable securities	44,762	64,728	140,462
Purchase of fixed assets	(5,407)	(6,362)	(10,484)
Purchase of intangible assets	(1,290)	0	(161)
Proceeds from divestiture of a business	0	7,766	0
Net cash (used in) provided by investing activities	(6,996)	13,358	15,304
Cash flows from financing activities:
Issuance of common stock under stock plans	3	3	2
Treasury stock repurchases, including accelerated share repurchases	(25,257)	(50,000)	(150,039)
Tax withholding on restricted stock units	(13,962)	(19,355)	(19,393)
Payment of debt issuance costs	(2,795)	0	0
Repayment of long-term debt	(175,000)	0	(250,000)
Proceeds from issuance of long-term debt	75,000	0	0
Net cash used in financing activities	(142,011)	(69,352)	(419,430)
Effect of exchange rate changes on cash and cash equivalents	(922)	63	(1,891)
Net increase (decrease) in cash and cash equivalents	67,741	2,880	(249,367)
Cash and cash equivalents, beginning of year	389,674	386,794	636,161
Cash and cash equivalents, end of year	457,415	389,674	386,794
Supplemental disclosures of cash flow information:
Cash paid for interest	4,190	6,427	8,063
Cash paid for income taxes	41,796	62,318	55,924
Non-cash transactions:
Transfers of inventory to fixed assets	1,020	1,814	1,371
Additions to property, plant and equipment included in accounts payable	461	158	56
Issuance of common stock under employee stock purchase plans	$ 11,409	$ 13,695	$ 14,353