Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net loss	$ (26,690)	$ (10,264)
Adjustments to reconcile net loss to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	75,209	80,581
Loss on disposal of fixed assets	421	58
Deal-related compensation expense and accretion charges	76	76
Share-based compensation expense associated with equity awards	22,829	19,802
Deferred income taxes	(17,335)	(25,328)
Other gains (losses)	732	(237)
Changes in assets and liabilities
Accounts receivable and unbilled costs	82,280	6,636
Due from related party	554	22,770
Inventories	(1,048)	239
Prepaid expenses and other assets	(1,668)	(7,773)
Accounts payable	(8,092)	4,414
Accrued compensation and other expenses	(8,080)	(14,041)
Due to related party	168	(2,579)
Income taxes payable	1,769	(3,469)
Deferred revenue	(49,064)	(18,657)
Net cash provided by operating activities	72,061	52,228
Cash flows from investing activities:
Purchase of marketable securities	(57,776)	(53,500)
Proceeds from maturity of marketable securities	155,741	86,853
Purchase of fixed assets	(7,554)	(15,748)
Purchase of intangible assets	(505)	(1,020)
Decrease (increase) in deposits	30	(53)
Acquisition of businesses, net of cash acquired	(8,334)	(4,606)
Contingent purchase consideration	523	660
Collection of contingently returnable consideration from related party	0	5,133
Capitalized software development costs	(110)	(1,231)
Net cash provided by investing activities	82,015	16,488
Cash flows from financing activities:
Issuance of common stock under stock plans	0	1
Payment of contingent consideration	(660)	0
Treasury stock repurchases	(200,000)	(76,592)
Tax withholding on restricted stock units	(11,027)	(6,623)
Net cash used in financing activities	(211,687)	(83,214)
Effect of exchange rate changes on cash and cash equivalents	4,299	(130)
Net decrease in cash and cash equivalents	(53,312)	(14,628)
Cash and cash equivalents and restricted cash, beginning of period	305,726	210,897
Cash and cash equivalents and restricted cash, end of period	252,414	196,269
Non-cash transactions:
Transfers of inventory to fixed assets	5,556	4,928
Additions to property, plant and equipment included in accounts payable	(417)	362
Issuance of common stock under employee stock plans	8,603	6,943
Contingent consideration related to acquisition, included in accrued other	$ 523	$ 660