Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 10,981	$ (24,753)
Adjustments to reconcile net income (loss) to cash provided by operating activities, net of the effects of acquisitions:
Depreciation and amortization	120,889	97,668
Loss on disposal of fixed assets	99	131
Deal-related compensation expense and accretion charges	114	6,690
Share-based compensation expense associated with equity awards	30,271	20,400
Deferred income taxes	(38,257)	6,981
Other gains (losses)	(371)	8
Changes in assets and liabilities
Accounts receivable and unbilled costs	(38,602)	(26,534)
Due from related party	24,679	(5,777)
Inventories	(2,543)	5,167
Prepaid expenses and other assets	7,587	(36,343)
Accounts payable	2,445	13,670
Accrued compensation and other expenses	2,926	35,236
Due to related party	(506)	(4,329)
Income taxes payable	(2,071)	(107)
Deferred revenue	14,285	(31,510)
Net cash provided by operating activities	131,926	56,598
Cash flows from investing activities:
Purchase of marketable securities	(135,737)	(74,667)
Proceeds from maturity of marketable securities	144,937	88,852
Purchase of fixed assets	(21,699)	(14,007)
Purchase of intangible assets	(1,022)	(154)
Decrease (increase) in deposits	22	(25)
Acquisition of businesses, net of cash acquired	(4,606)	27,701
Contingent purchase consideration	660	0
Collection of contingently returnable consideration	12,864	8,750
Change in restricted cash	(660)	0
Capitalized software development costs	(1,346)	(1,148)
Net cash (used in) provided by investing activities	(6,587)	35,302
Cash flows from financing activities:
Issuance of common stock under stock plans	2	1
Treasury stock repurchases	(88,133)	(212,426)
Proceeds from issuance of long-term debt, net of issuance costs	0	244,623
Excess tax benefit from share-based compensation awards	(1,091)	1,786
Net cash (used in) provided by financing activities	(89,222)	33,984
Effect of exchange rate changes on cash and cash equivalents	(1,995)	(256)
Net increase in cash and cash equivalents	34,122	125,628
Cash and cash equivalents, beginning of period	210,711	104,893
Cash and cash equivalents, end of period	244,833	230,521
Non-cash transactions:
Transfers of inventory to fixed assets	4,928	1,855
Additions to property, plant and equipment included in accounts payable	1,057	316
Debt issuance costs settled through the issuance of additional debt	0	5,377
Gross increase in contingently returnable consideration asset relating to fair value adjustment	0	3,676
Issuance of common stock under employee stock plans	6,943	3,028
Contingent consideration related to acquisition, included in accrued other	660	0
Purchase of business
Non-cash transactions:
Noncash acquisition consideration	0	2,276,235
Contingently returnable consideration
Non-cash transactions:
Noncash acquisition consideration	$ 0	$ 29,376