Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ 17,383	$ 7,896	$ 10,251	$ (3,445)
Adjustments to reconcile net (income) loss to cash (used in) provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization			42,847	48,246
Loss on extinguishment of debt			0	596
Operating lease right-of-use assets			5,327	4,904
Loss on disposal of fixed assets			13	2
Share-based compensation expense			32,082	30,700
Deferred income taxes			(5,963)	(6,270)
Other gains			0	(10)
Changes in assets and liabilities
Accounts receivable and unbilled costs			8,850	34,935
Inventories			2,745	(5,481)
Prepaid expenses and other assets			(15,583)	(7,082)
Accounts payable			(737)	(313)
Accrued compensation and other expenses			(19,562)	(17,753)
Operating lease liabilities			(6,128)	(5,591)
Income taxes payable			(4,383)	(2,225)
Deferred revenue			(52,148)	(23,874)
Net cash (used in) provided by operating activities			(2,389)	47,339
Cash flows from investing activities:
Purchase of marketable securities			(60,914)	(11,343)
Proceeds from sales and maturity of marketable securities			81,131	13,266
Purchase of fixed assets			(5,215)	(4,301)
Purchase of intangible assets			(161)	0
Decrease in deposits			9	26
Net cash provided by (used in) investing activities			14,850	(2,352)
Cash flows from financing activities:
Issuance of common stock under stock plans			2	2
Treasury stock repurchases, including accelerated share repurchases			(150,039)	(24,413)
Tax withholding on restricted stock units			(19,007)	(14,997)
Payment of debt issuance costs			0	(3,660)
Repayment of long-term debt			(150,000)	(350,000)
Proceeds from issuance of long-term debt			0	350,000
Net cash used in financing activities			(319,044)	(43,068)
Effect of exchange rate changes on cash and cash equivalents			(9,253)	(625)
Net (decrease) increase in cash and cash equivalents			(315,836)	1,294
Cash and cash equivalents, beginning of period			636,161	467,176	$ 467,176
Cash and cash equivalents, end of period	$ 320,325	$ 468,470	320,325	468,470	$ 636,161
Supplemental disclosures:
Cash paid for interest			3,001	2,540
Cash paid for income taxes			30,134	18,963
Non-cash transactions:
Transfers of inventory to fixed assets			1,371	2,657
Additions to property, plant and equipment included in accounts payable			289	243
Issuance of common stock under employee stock plans			6,539	6,890
Unsettled share repurchases, included in accounts payable			$ 0	$ 235