Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (147,734)	$ 59,648	$ 35,874
Adjustments to reconcile net income (loss) to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	74,986	85,918	95,784
Loss on extinguishment of debt	0	0	596
Operating lease right-of-use assets	10,533	10,598	10,292
Gain on divestiture of a business	(3,806)	0	0
Loss on disposal of fixed assets	303	49	5
Share-based compensation expense associated with equity awards	70,799	61,986	56,074
Change in fair value of derivative instrument	(206)	1,380	0
Goodwill impairment	217,260	0	0
Net change in fair value of contingent and contractual liabilities	0	0	(837)
Deferred income taxes	(45,949)	(54,032)	(12,681)
Other gains	(5,451)	(1)	(11)
Changes in assets and liabilities
Accounts receivable and unbilled costs	(48,376)	4,897	49,322
Inventories	609	9,007	(7,996)
Prepaid expenses and other assets	(5,835)	5,039	(13,001)
Accounts payable	(1,861)	(5,549)	4,211
Accrued compensation and other expenses	(33,704)	12,071	2,391
Operating lease liabilities	(11,952)	(11,927)	(12,060)
Income taxes payable	(3,620)	165	(3,087)
Deferred revenue	(7,185)	(22,599)	91,137
Net cash provided by operating activities	58,811	156,650	296,013
Cash flows from investing activities:
Purchase of marketable securities and investments	(52,774)	(114,513)	(78,367)
Proceeds from maturity of marketable securities	64,728	140,462	20,569
Purchase of fixed assets	(6,337)	(10,487)	(10,350)
Purchase of intangible assets	0	(161)	(50)
Proceeds from divestiture of a business	7,766	0	0
(Increase) decrease in deposits	(25)	3	(155)
Net cash provided by (used in) investing activities	13,358	15,304	(68,353)
Cash flows from financing activities:
Issuance of common stock under stock plans	3	2	2
Treasury stock repurchases, including accelerated share repurchases	(50,000)	(150,039)	(35,653)
Tax withholding on restricted stock units	(19,355)	(19,393)	(15,691)
Payment of debt issuance costs	0	0	(3,660)
Repayment of long-term debt	0	(250,000)	(350,000)
Proceeds from issuance of long-term debt	0	0	350,000
Collection of contingent consideration	0	0	837
Net cash used in financing activities	(69,352)	(419,430)	(54,165)
Effect of exchange rate changes on cash and cash equivalents	63	(1,891)	(4,510)
Net increase (decrease) in cash and cash equivalents	2,880	(249,367)	168,985
Cash and cash equivalents, beginning of year	386,794	636,161	467,176
Cash and cash equivalents, end of year	389,674	386,794	636,161
Supplemental disclosures of cash flow information:
Cash paid for interest	6,427	8,063	4,962
Cash paid for income taxes	62,318	55,924	31,702
Non-cash transactions:
Transfers of inventory to fixed assets	1,814	1,371	2,657
Additions to property, plant and equipment included in accounts payable	158	56	197
Issuance of common stock under employee stock purchase plans	$ 13,695	$ 14,353	$ 14,582