Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (88,932)	$ (26,690)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	74,558	75,209
Loss on divestiture of business	7,390	0
Loss on disposal of fixed assets	174	421
Deal-related compensation expense and accretion charges	76	76
Share-based compensation expense	30,383	22,829
Accretion of contingent consideration	(10)	0
Impairment of intangible assets	35,871	0
Deferred income taxes	(22,289)	(17,335)
Other (gains) losses	(208)	732
Changes in assets and liabilities
Accounts receivable and unbilled costs	29,325	82,280
Due from related party	1,719	554
Inventories	892	(1,048)
Prepaid expenses and other assets	4,751	(1,668)
Accounts payable	(9,518)	(8,092)
Accrued compensation and other expenses	15,413	(8,080)
Due to related party	(3)	168
Income taxes payable	(1,759)	1,769
Deferred revenue	(45,127)	(49,064)
Net cash provided by operating activities	32,706	72,061
Cash flows from investing activities:
Purchase of marketable securities	(136,019)	(57,776)
Proceeds from maturity of marketable securities	94,057	155,741
Purchase of fixed assets	(12,207)	(7,554)
Payments related to the divestiture of business	(2,911)	0
Purchase of intangible assets	0	(505)
(Increase) decrease in deposits	(97)	30
Acquisition of businesses, net of cash acquired	0	(8,334)
Contingent purchase consideration	0	523
Capitalized software development costs	0	(110)
Net cash (used in) provided by investing activities	(57,177)	82,015
Cash flows from financing activities:
Issuance of common stock under stock plans	2	0
Payment of contingent consideration	(523)	(660)
Treasury stock repurchases	0	(200,000)
Tax withholding on restricted stock units	(9,854)	(11,027)
Net cash used in financing activities	(10,375)	(211,687)
Effect of exchange rate changes on cash and cash equivalents	(3,515)	4,299
Net decrease in cash and cash equivalents	(38,361)	(53,312)
Cash and cash equivalents and restricted cash, beginning of period	370,731	305,726
Cash and cash equivalents and restricted cash, end of period	332,370	252,414
Non-cash transactions:
Transfers of inventory to fixed assets	2,152	5,556
Additions to property, plant and equipment included in accounts payable	1,929	(417)
Tenant improvement allowance	10,171	0
Issuance of common stock under employee stock plans	7,575	8,603
Contingent consideration related to acquisition	0	523
Fair value of contingent consideration received as partial consideration for divestiture of business	$ 2,257	$ 0