Condensed Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Operating activities:
Net loss		$ (25,157)	$ (38,924)	$ (21,917)	$ (196,923)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization		134,236	111,954	393,838	330,358
Amortization of debt discount and transaction costs		7,138	9,420	20,290	31,160
Gain on sales of land and building improvements		(21,792)	(15,625)	(21,792)	(15,625)
50 Fremont lease termination, net	[1],[2]	0	0	(36,617)	0
Loss on conversions of convertible senior notes		0	1,340	0	10,230
Abandonment of leasehold improvement		7,086	0	7,086	0
Amortization of deferred commissions		78,934	65,371	232,768	186,526
Expenses related to employee stock plans		144,317	139,460	434,656	412,963
Excess tax benefits from employee stock plans		(44,607)	(1,221)	(48,698)	(3,447)
Changes in assets and liabilities, net of business combinations:
Accounts receivable, net		15,262	39,792	853,014	566,306
Deferred commissions		(80,030)	(64,280)	(200,867)	(171,022)
Prepaid expenses and other current assets and other assets		33,841	6,588	4,495	34,501
Accounts payable, accrued expenses and other liabilities		57,577	(1,933)	12,276	(44,894)
Deferred revenue		(188,898)	(129,431)	(475,357)	(298,642)
Net cash provided by operating activities		117,907	122,511	1,153,175	841,491
Investing activities:
Business combinations, net of cash acquired		(27,759)	38,071	(58,680)	38,071
Proceeds from land and building improvements held for sale		127,066	192,240	127,066	223,240
Purchase of 50 Fremont land and building		0	0	(425,376)	0
Deposit for purchase of 50 Fremont land and building		0	(114,935)	115,015	(114,935)
Non-refundable amounts received for sale of land available for sale		0	0	6,284	0
Strategic investments		(30,330)	(12,852)	(325,226)	(47,905)
Purchases of marketable securities		(200,001)	(154,560)	(543,422)	(690,024)
Sales of marketable securities		91,153	46,908	414,259	197,293
Maturities of marketable securities		7,166	22,288	23,445	46,248
Capital expenditures		(80,041)	(73,426)	(216,011)	(205,100)
Net cash used in investing activities		(112,746)	(56,266)	(882,646)	(553,112)
Financing activities:
Proceeds from revolving credit facility, net		0	297,325	0	297,325
Proceeds from employee stock plans		98,016	91,337	367,830	226,561
Excess tax benefits from employee stock plans		44,607	1,221	48,698	3,447
Payments on convertible senior notes		0	(89,645)	0	(387,229)
Principal payments on capital lease obligations		(10,945)	(10,345)	(68,844)	(61,280)
Payments on revolving credit facility and term loan		0	(270,000)	(300,000)	(285,000)
Net cash provided by (used in) financing activities		131,678	19,893	47,684	(206,176)
Effect of exchange rate changes		(2,872)	(14,538)	(3,012)	(17,513)
Net increase in cash and cash equivalents		133,967	71,600	315,201	64,690
Cash and cash equivalents, beginning of period		1,089,351	774,725	908,117	781,635
Cash and cash equivalents, end of period		1,223,318	846,325	1,223,318	846,325
Cash paid during the period for:
Interest		4,085	4,285	32,756	21,274
Income taxes, net of tax refunds		8,248	6,187	24,450	30,986
Non-cash financing and investing activities:
Fixed assets acquired under capital leases		2,065	38,604	7,191	119,939
Building in progress - leased facility acquired under financing obligation		38,477	29,756	75,336	62,804
Fair value of loan assumed on 50 Fremont		$ 0	$ 0	$ 198,751	$ 0
Fair value of common stock issued as consideration for business combinations		0	338,033	0	338,033

[1] Amounts include amortization of purchased intangibles from business combinations, as follows: Three Months Ended October 31, Nine Months Ended October 31, 2015 2014 2015 2014Cost of revenues$20,296 $20,351 $60,825 $70,294Marketing and sales18,966 15,095 57,995 44,708Other non-operating expense761 0 2,877 0

[2] Amounts include stock-based expense, as follows: Three Months Ended October 31, Nine Months Ended October 31, 2015 2014 2015 2014Cost of revenues$17,516 $14,118 $49,237 $38,905Research and development31,534 26,868 96,508 87,264Marketing and sales69,561 72,892 211,819 210,510General and administrative25,706 25,582 77,092 76,284