Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net loss	$ (3,445)	$ (21,106)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	48,246	53,152
Loss on extinguishment of debt	596	0
Operating lease right-of-use assets	4,904	5,190
Loss on disposal of fixed assets	2	37
Share-based compensation expense	30,700	27,832
Deferred income taxes	(6,270)	(6,624)
Other gains	(10)	0
Changes in assets and liabilities
Accounts receivable and unbilled costs	34,935	44,640
Inventories	(5,481)	(5,472)
Prepaid expenses and other assets	(7,082)	(4,330)
Accounts payable	(313)	(1,339)
Accrued compensation and other expenses	(17,753)	9,484
Operating lease liabilities	(5,591)	(5,168)
Income taxes payable	(2,225)	(171)
Deferred revenue	(23,874)	(39,479)
Net cash provided by operating activities	47,339	56,646
Cash flows from investing activities:
Purchase of marketable securities	(11,343)	(6,780)
Proceeds from sales and maturity of marketable securities	13,266	45,094
Purchase of fixed assets	(4,301)	(5,769)
Purchase of intangible assets	0	(4,537)
Decrease in deposits	26	106
Net cash (used in) provided by investing activities	(2,352)	28,114
Cash flows from financing activities:
Issuance of common stock under stock plans	2	1
Payment of contingent consideration	0	(1,000)
Treasury stock repurchases	(24,413)	0
Tax withholding on restricted stock units	(14,997)	(12,600)
Payment of debt issuance costs	(3,660)	0
Repayment of long-term debt	(350,000)	0
Proceeds from issuance of long-term debt	350,000	0
Net cash used in financing activities	(43,068)	(13,599)
Effect of exchange rate changes on cash and cash equivalents	(625)	5,069
Net increase in cash and cash equivalents and restricted cash	1,294	76,230
Cash and cash equivalents and restricted cash, beginning of period	467,176	340,237
Cash and cash equivalents and restricted cash, end of period	468,470	416,467
Supplemental disclosures:
Cash paid for interest	2,540	4,177
Cash paid for income taxes	18,963	5,377
Non-cash transactions:
Transfers of inventory to fixed assets	2,657	1,530
Additions to property, plant and equipment included in accounts payable	243	605
Issuance of common stock under employee stock plans	6,890	6,475
Unsettled share repurchases, included in accounts payable	$ 235	$ 0