Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (17,420)	$ (29,343)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	26,009	29,335
Operating lease right-of-use assets	2,576	2,552
Loss on disposal of fixed assets	33	0
Share-based compensation expense	12,096	12,743
Net change in fair value of contingent and contractual liabilities	0	541
Accretion of contingent consideration	0	(18)
Deferred income taxes	(3,722)	830
Other losses (gains)	45	(81)
Changes in assets and liabilities
Accounts receivable and unbilled costs	75,152	75,092
Inventories	(5,544)	(1,208)
Prepaid expenses and other assets	(167)	4,238
Accounts payable	(2,423)	(634)
Accrued compensation and other expenses	(13,221)	(16,332)
Operating lease liabilities	(2,634)	(3,425)
Income taxes payable	(378)	85
Deferred revenue	(25,471)	(24,917)
Net cash provided by operating activities	44,931	49,458
Cash flows from investing activities:
Purchase of marketable securities	(5,743)	(41,039)
Proceeds from sales and maturity of marketable securities	33,026	28,995
Purchase of fixed assets	(2,605)	(3,287)
Purchase of intangible assets	(4,237)	0
Decrease in deposits	102	0
Acquisition of businesses	0	(4,154)
Net cash provided by (used in) investing activities	20,543	(19,485)
Cash flows from financing activities:
Payment of contingent consideration	(1,000)	0
Repayment of long-term debt	0	(50,000)
Treasury stock repurchases	0	(30,708)
Tax withholding on restricted stock units	(3,103)	(3,012)
Net cash used in financing activities	(4,103)	(83,720)
Effect of exchange rate changes on cash and cash equivalents	2,446	(1,163)
Net increase (decrease) in cash and cash equivalents and restricted cash	63,817	(54,910)
Cash and cash equivalents and restricted cash, beginning of period	340,237	409,820
Cash and cash equivalents and restricted cash, end of period	404,054	354,910
Supplemental disclosures:
Cash paid for interest	2,298	5,639
Cash paid for income taxes	1,474	3,211
Non-cash transactions:
Transfers of inventory to fixed assets	491	862
Additions to property, plant and equipment included in accounts payable	309	794
Contingent consideration related to acquisition, included in accrued other	0	1,000
Proceeds from Securities Purchased under Agreements to Resell	$ 0	$ 2,469