CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Oct. 31, 2013	Jan. 31, 2013
Current assets [Abstract]:
Cash and cash equivalents	$ 1,473.4	$ 1,612.2
Marketable securities	587.1	342.1
Accounts receivable, net	304.1	495.1
Deferred income taxes	53.5	42.2
Prepaid expenses and other current assets	99.8	60.8
Total current assets	2,517.9	2,552.4
Marketable securities	418.5	411.1
Computer equipment, software, furniture and leasehold improvements, net	134.1	114.9
Purchased technologies, net	54.3	76.0
Goodwill	922.3	871.5
Deferred income taxes, net	118.3	122.8
Other assets	156.1	159.7
Assets, Total	4,321.5	4,308.4
Current liabilities [Abstract]:
Accounts payable	75.3	94.2
Accrued compensation	154.7	189.6
Accrued income taxes	37.2	13.9
Deferred revenue	610.8	647.0
Other accrued liabilities	70.1	99.0
Total current liabilities	948.1	1,043.7
Deferred revenue	154.9	187.6
Long term income taxes payable	209.0	194.2
Long-term Debt	746.2	745.6
Other liabilities	101.4	94.1
Commitments and contingencies	0	0
Stockholders' equity [Abstract]:
Preferred stock	0	0
Common stock and additional paid-in capital	1,535.1	1,449.8
Accumulated other comprehensive income	(4.1)	(5.7)
Retained earnings	630.9	599.1
Total stockholders' equity	2,161.9	2,043.2
Liabilities and Equity, Total	$ 4,321.5	$ 4,308.4