CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net income (loss)	$ 173,533	$ 67,303	$ (8,302)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Amortization and impairment of software development costs and licenses	77,887	221,911	134,472
Stock-based compensation	116,349	81,879	69,996
Amortization of intellectual property	34,830	6,738	160
Depreciation	32,202	30,707	28,800
Amortization of discount on Convertible Notes	15,662	21,222	23,457
Impairment of in-process research and development	11,257	0	0
Amortization of debt issuance costs	578	1,227	1,567
Deferred income taxes	(32,523)	3,020	(270)
Gain on long-term investments, net	0	(1,350)	(2,683)
Gain on redemption of Convertible Notes	(4,900)	0	0
Other, net	6,375	(3,410)	2,588
Changes in assets and liabilities:
Restricted cash	(99,580)	(76,474)	(91,491)
Accounts receivable	(26,998)	(41,956)	49,348
Inventory	3,917	(4,942)	3,809
Software development costs and licenses	(225,269)	(252,951)	(219,217)
Prepaid expenses, other current and other non-current assets	(74,544)	(22,155)	(12,272)
Deferred revenue	198,397	126,285	152,325
Deferred cost of goods sold	(11,959)	(14,969)	(41,144)
Accounts payable, accrued expenses and other liabilities	198,733	189,344	170,162
Net cash provided by operating activities	393,947	331,429	261,305
Investing activities:
Change in bank time deposits	(40,918)	89,076	(182,383)
Proceeds from available-for-sale securities	241,012	155,936	43,314
Purchases of available-for-sale securities	(369,998)	(221,671)	(150,501)
Purchases of fixed assets	(61,557)	(21,167)	(37,280)
Proceeds from sale of long-term investment	0	1,350	2,683
Purchase of long-term investments	(5,000)	(1,885)	0
Business acquisitions, net of cash acquired	(9,401)	(130,669)	0
Asset acquisition	(25,965)	0	0
Other	0	0	(349)
Net cash used in investing activities	(271,827)	(129,030)	(324,516)
Financing activities:
Tax payment related to net share settlements on restricted stock awards	(112,884)	(51,762)	(22,916)
Repurchase of common stock	(154,792)	0	(26,552)
Excess tax benefit from stock-based compensation	0	1,990	1,421
Other	(13,791)	0	0
Net cash used in financing activities	(281,467)	(49,772)	(48,047)
Effects of foreign currency exchange rates on cash and cash equivalents	24,924	(7,973)	(1,120)
Net change in cash and cash equivalents	(134,423)	144,654	(112,378)
Cash and cash equivalents, beginning of year	943,396	798,742	911,120
Cash and cash equivalents, end of year	808,973	943,396	798,742
Supplemental data:
Interest paid	4,121	7,628	7,626
Income taxes paid (refunded)	$ 8,790	$ 6,648	$ (26,223)