Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (46,815)	$ (88,932)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	58,666	74,558
Operating lease right-of-use assets	5,106
Loss on divestiture of business	0	7,390
Loss on disposal of fixed assets	0	174
Deal-related compensation expense and accretion charges	0	76
Share-based compensation expense	28,600	30,383
Net change in fair value of contingent and contractual liabilities	541	0
Accretion of contingent consideration	(24)	(10)
Impairment of intangible assets	0	35,871
Deferred income taxes	(2,945)	(22,289)
Other gains	(85)	(208)
Changes in assets and liabilities
Accounts receivable and unbilled costs	32,937	29,325
Due from related party	0	1,719
Inventories	(2,484)	892
Prepaid expenses and other assets	11,289	4,751
Accounts payable	10,099	(9,518)
Accrued compensation and other expenses	(4,370)	15,413
Operating lease liabilities	(6,565)
Due to related party	0	(3)
Income taxes payable	(48)	(1,759)
Deferred revenue	(35,446)	(45,127)
Net cash provided by operating activities	48,456	32,706
Cash flows from investing activities:
Purchase of marketable securities	(83,502)	(136,019)
Proceeds from sales and maturity of marketable securities	98,147	94,057
Purchase of fixed assets	(9,056)	(12,207)
Payments related to the divestiture of business	0	(2,911)
Increase in deposits	(4)	(97)
Acquisition of businesses	(4,154)	0
Net cash provided by (used in) investing activities	1,431	(57,177)
Cash flows from financing activities:
Issuance of common stock under stock plans	2	2
Payment of contingent consideration	0	(523)
Repayment of long-term debt	(100,000)	0
Treasury stock repurchases	(100,000)	0
Tax withholding on restricted stock units	(11,377)	(9,854)
Net cash used in financing activities	(211,375)	(10,375)
Effect of exchange rate changes on cash and cash equivalents	(2,268)	(3,515)
Net decrease in cash and cash equivalents and restricted cash	(163,756)	(38,361)
Cash and cash equivalents and restricted cash, beginning of period	409,820	370,731
Cash and cash equivalents and restricted cash, end of period	246,064	332,370
Supplemental disclosures:
Cash paid for interest	10,167	11,065
Cash paid for income taxes	7,232	6,434
Non-cash transactions:
Transfers of inventory to fixed assets	2,290	2,152
Additions to property, plant and equipment included in accounts payable	238	1,929
Tenant improvement allowance	0	10,171
Issuance of common stock under employee stock plans	6,593	7,575
Contingent consideration related to acquisition, included in accrued other	1,000	0
Fair value of contingent consideration received as partial consideration for divestiture of business	$ 0	$ 2,257