Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (21,106)	$ (46,815)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	53,152	58,666
Operating lease right-of-use assets	5,190	5,106
Loss on disposal of fixed assets	37	0
Share-based compensation expense	27,832	28,600
Net change in fair value of contingent and contractual liabilities	0	541
Accretion of contingent consideration	0	(24)
Deferred income taxes	(6,624)	(2,945)
Other gains	0	(85)
Changes in assets and liabilities
Accounts receivable and unbilled costs	44,640	32,937
Inventories	(5,472)	(2,484)
Prepaid expenses and other assets	(4,330)	11,289
Accounts payable	(1,339)	10,099
Accrued compensation and other expenses	9,484	(4,370)
Operating lease liabilities	(5,168)	(6,565)
Income taxes payable	(171)	(48)
Deferred revenue	(39,479)	(35,446)
Net cash provided by operating activities	56,646	48,456
Cash flows from investing activities:
Purchase of marketable securities	(6,780)	(83,502)
Proceeds from sales and maturity of marketable securities	45,094	98,147
Purchase of fixed assets	(5,769)	(9,056)
Purchase of intangible assets	(4,537)	0
Decrease (increase) in deposits	106
Decrease (increase) in deposits		(4)
Acquisition of businesses	0	(4,154)
Net cash provided by investing activities	28,114	1,431
Cash flows from financing activities:
Issuance of common stock under stock plans	1	2
Payment of contingent consideration	(1,000)	0
Repayment of long-term debt	0	(100,000)
Treasury stock repurchases	0	(100,000)
Tax withholding on restricted stock units	(12,600)	(11,377)
Net cash used in financing activities	(13,599)	(211,375)
Effect of exchange rate changes on cash and cash equivalents	5,069	(2,268)
Net increase (decrease) in cash and cash equivalents and restricted cash	76,230	(163,756)
Cash and cash equivalents and restricted cash, beginning of period	340,237	409,820
Cash and cash equivalents and restricted cash, end of period	416,467	246,064
Supplemental disclosures:
Cash paid for interest	4,177	10,167
Cash paid for income taxes	5,377	7,232
Non-cash transactions:
Transfers of inventory to fixed assets	1,530	2,290
Additions to property, plant and equipment included in accounts payable	605	238
Issuance of common stock under employee stock plans	6,475	6,593
Contingent consideration related to acquisition, included in accrued other	$ 0	$ 1,000