Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (11,341)	$ (17,420)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	24,237	26,009
Operating lease right-of-use assets	2,679	2,576
Loss on disposal of fixed assets	1	33
Share-based compensation expense	13,965	12,096
Deferred income taxes	(2,896)	(3,722)
Other losses	217	45
Changes in assets and liabilities
Accounts receivable and unbilled costs	51,773	75,152
Inventories	1,132	(5,544)
Prepaid expenses and other assets	(7,416)	(167)
Accounts payable	(1,084)	(2,423)
Accrued compensation and other expenses	(29,432)	(13,221)
Operating lease liabilities	(2,984)	(2,634)
Income taxes payable	(1,461)	(378)
Deferred revenue	(13,334)	(25,471)
Net cash provided by operating activities	24,056	44,931
Cash flows from investing activities:
Purchase of marketable securities	(5,696)	(5,743)
Proceeds from sales and maturity of marketable securities	8,230	33,026
Purchase of fixed assets	(2,578)	(2,605)
Purchase of intangible assets	0	(4,237)
Decrease in deposits	12	102
Net cash (used in) provided by investing activities	(32)	20,543
Cash flows from financing activities:
Payment of contingent consideration	0	(1,000)
Tax withholding on restricted stock units	(4,777)	(3,103)
Net cash used in financing activities	(4,777)	(4,103)
Effect of exchange rate changes on cash and cash equivalents	745	2,446
Net increase in cash and cash equivalents and restricted cash	19,992	63,817
Cash and cash equivalents and restricted cash, beginning of period	467,176	340,237
Cash and cash equivalents and restricted cash, end of period	487,168	404,054
Supplemental disclosures:
Cash paid for interest	1,393	2,298
Cash paid for income taxes	12,730	1,474
Non-cash transactions:
Transfers of inventory to fixed assets	949	491
Additions to property, plant and equipment included in accounts payable	$ 76	$ 309