Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (7,132)	$ (11,341)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	21,585	24,237
Operating lease right-of-use assets	2,663	2,679
Loss on disposal of fixed assets	0	1
Share-based compensation expense	15,581	13,965
Deferred income taxes	(3,290)	(2,896)
Other losses	0	217
Changes in assets and liabilities
Accounts receivable and unbilled costs	35,266	51,773
Inventories	4,156	1,132
Prepaid expenses and other assets	(10,793)	(7,416)
Accounts payable	(2,483)	(1,084)
Accrued compensation and other expenses	(23,772)	(29,432)
Operating lease liabilities	(3,085)	(2,984)
Income taxes payable	(1,607)	(1,461)
Deferred revenue	(39,610)	(13,334)
Net cash (used in) provided by operating activities	(12,521)	24,056
Cash flows from investing activities:
Purchase of marketable securities	(27,691)	(5,696)
Proceeds from sales and maturity of marketable securities	52,570	8,230
Purchase of fixed assets	(2,201)	(2,578)
Purchase of intangible assets	(161)	0
Decrease in deposits	5	12
Net cash provided by (used in) investing activities	22,522	(32)
Cash flows from financing activities:
Issuance of common stock under stock plans	1	0
Treasury stock repurchases, including accelerated share repurchases	(150,039)	0
Tax withholding on restricted stock units	(10,808)	(4,777)
Repayment of long-term debt	(150,000)	0
Net cash used in financing activities	(310,846)	(4,777)
Effect of exchange rate changes on cash and cash equivalents	(2,814)	745
Net (decrease) increase in cash and cash equivalents	(303,659)	19,992
Cash and cash equivalents, beginning of period	636,161	467,176
Cash and cash equivalents, end of period	332,502	487,168
Supplemental disclosures:
Cash paid for interest	1,310	1,393
Cash paid for income taxes	13,179	12,730
Non-cash transactions:
Transfers of inventory to fixed assets	1,212	949
Additions to property, plant and equipment included in accounts payable	$ 382	$ 76