Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024
Cash flows from operating activities:
Net loss	$ 48,810		$ (132,577)	$ (385,539)	$ (115,315)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization				48,190	56,928
Loss on extinguishment of debt				1,134	0
Operating lease right-of-use asset amortization				7,852	7,857
Gain on divestiture of a business	0		0	0	(3,806)
Loss on disposal of fixed assets				15	299
Share-based compensation expense				50,586	54,653
Change in fair value of derivative investment				0	(206)
Goodwill impairment	0	$ 427,000	167,106	426,967	167,106	$ 217,300
Deferred income taxes				(32,248)	(35,530)
Other gains				(2,947)	(1,758)
Changes in assets and liabilities
Accounts receivable and unbilled costs				(22,374)	(77,787)
Inventories and deferred costs				(1,460)	(634)
Prepaid expenses and other assets				6,688	(6,583)
Accounts payable				(485)	(984)
Accrued compensation and other expenses				9,158	(46,170)
Operating lease liabilities				(9,274)	(8,970)
Income taxes payable				(296)	(2,631)
Deferred revenue				(19,818)	(21,236)
Net cash provided by (used in) operating activities				76,149	(34,767)
Cash flows from investing activities:
Purchase of marketable securities and investments				(29,348)	(43,159)
Proceeds from sales and maturity of marketable securities				36,688	53,569
Purchase of fixed assets				(4,009)	(4,747)
Purchase of intangible assets				(1,290)	0
Proceeds from divestiture of a business				0	7,766
Net cash provided by investing activities				2,041	13,429
Cash flows from financing activities:
Issuance of common stock under stock plans				2	3
Treasury stock repurchases				(25,257)	(50,000)
Tax withholding on restricted stock units				(13,829)	(19,151)
Payment of debt issuance costs				(2,450)	0
Repayment of long-term debt				(100,000)	0
Proceeds from issuance of long-term debt				75,000	0
Net cash used in financing activities				(66,534)	(69,148)
Effect of exchange rate changes on cash and cash equivalents				(2,969)	1,347
Net increase (decrease) in cash and cash equivalents				8,687	(89,139)
Cash and cash equivalents, beginning of period		$ 389,674		389,674	386,794	386,794
Cash and cash equivalents, end of period	$ 398,361		$ 297,655	398,361	297,655	$ 389,674
Supplemental disclosures:
Cash paid for interest				3,793	4,817
Cash paid for income taxes				32,197	54,481
Non-cash transactions:
Transfers of inventory to fixed assets				1,020	1,814
Additions to property, plant and equipment included in accounts payable				318	414
Issuance of common stock under employee stock plans				$ 4,577	$ 6,006