CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Operating activities:
Net income (loss)	$ 67,303	$ (8,302)	$ (279,470)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization and impairment of software development costs and licenses	221,911	134,472	133,453
Stock-based compensation	81,879	69,996	65,246
Depreciation and amortization	30,707	28,800	21,057
Amortization of discount on Convertible Notes	21,222	23,457	22,026
Amortization and impairment of intellectual property	6,738	160	344
Deferred income taxes	3,020	(270)	2,279
Amortization of debt issuance costs	1,227	1,567	1,663
Gain on long-term investments, net	(1,350)	(2,683)	(17,476)
Other, net	(3,410)	2,588	2,068
Changes in assets and liabilities:
Restricted cash	(76,474)	(91,491)	24,161
Accounts receivable	(41,956)	49,348	(164,717)
Inventory	(4,942)	3,809	9,729
Software development costs and licenses	(252,951)	(219,217)	(188,772)
Prepaid expenses, other current and other non-current assets	(22,155)	(12,272)	5,398
Deferred revenue	126,285	152,325	568,028
Deferred cost of goods sold	(14,969)	(41,144)	(70,788)
Accounts payable, accrued expenses and other liabilities	189,344	170,162	78,585
Net cash provided by operating activities	331,429	261,305	212,814
Investing activities:
Change in bank time deposits	89,076	(182,383)	(87,500)
Proceeds from available-for-sale securities	155,936	43,314	0
Purchases of available-for-sale securities	(195,733)	(150,501)	(100,116)
Purchases of commercial paper	(25,938)	0	0
Purchases of fixed assets	(21,167)	(37,280)	(49,501)
Proceeds from sale of long-term investment	1,350	2,683	21,976
Purchase of long-term investments	(1,885)	0	(5,000)
Business acquisitions, net of cash acquired	(130,669)	0	0
Other	0	(349)	0
Net cash used in investing activities	(129,030)	(324,516)	(220,141)
Financing activities:
Tax payment related to net share settlements on restricted stock awards	(51,762)	(22,916)	0
Repurchase of common stock	0	(26,552)	0
Excess tax benefit from stock-based compensation	1,990	1,421	928
Net cash (used in) provided by financing activities	(49,772)	(48,047)	928
Effects of foreign currency exchange rates on cash and cash equivalents	(7,973)	(1,120)	(17,881)
Net increase (decrease) in cash and cash equivalents	144,654	(112,378)	(24,280)
Cash and cash equivalents, beginning of year	798,742	911,120	935,400
Cash and cash equivalents, end of year	943,396	798,742	911,120
Supplemental data:
Interest paid	7,628	7,626	7,657
Income taxes paid (refunded)	$ 6,648	$ (26,223)	$ 9,749