Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income (loss)	$ (92,535)	$ 62,995
Adjustments to reconcile net income (loss) to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	106,509	112,859
Loss on divestiture of business	7,390	0
Loss on disposal of fixed assets	181	458
Deal-related compensation expense and accretion charges	102	114
Share-based compensation expense	44,142	35,254
Accretion of contingent consideration	(64)	0
Impairment of intangible assets	35,871	0
Deferred income taxes	(27,667)	(100,042)
Other (gains) losses	(206)	68
Changes in assets and liabilities
Accounts receivable and unbilled costs	(33,928)	47,439
Due from related party	171	554
Inventories	2,683	(1,222)
Prepaid expenses and other assets	5,582	29,324
Accounts payable	582	(5,378)
Accrued compensation and other expenses	28,385	(18,884)
Due to related party	232	(82)
Income taxes payable	(1,754)	(1,286)
Deferred revenue	(6,162)	(13,253)
Net cash provided by operating activities	69,514	148,918
Cash flows from investing activities:
Purchase of marketable securities	(184,104)	(71,323)
Proceeds from maturity of marketable securities	155,346	180,018
Purchase of fixed assets	(19,462)	(12,352)
Payments related to the divestiture of business	(2,911)	0
Purchase of intangible assets	0	(505)
Increase in deposits	(97)	(26)
Acquisition of businesses, net of cash acquired	0	(8,334)
Contingent purchase consideration	0	523
Capitalized software development costs	(132)	(136)
Net cash (used in) provided by investing activities	(51,360)	87,865
Cash flows from financing activities:
Issuance of common stock under stock plans	2	1
Payment of contingent consideration	(2,851)	(660)
Treasury stock repurchases	0	(200,000)
Tax withholding on restricted stock units	(11,415)	(12,957)
Net cash used in financing activities	(14,264)	(213,616)
Effect of exchange rate changes on cash and cash equivalents	(5,380)	3,929
Net (decrease) increase in cash and cash equivalents	(1,490)	27,096
Cash and cash equivalents and restricted cash, beginning of period	370,731	305,726
Cash and cash equivalents and restricted cash, end of period	369,241	332,822
Non-cash transactions:
Transfers of inventory to fixed assets	2,152	5,556
Additions to property, plant and equipment included in accounts payable	1,190	314
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