CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Millions, unless otherwise specified	Oct. 31, 2012	Jan. 31, 2012
Current assets [Abstract]:
Cash and cash equivalents	$ 827.0	$ 1,156.9
Marketable securities	502.1	254.4
Accounts receivable, net	293.3	395.1
Deferred income taxes	48.4	30.1
Prepaid expenses and other current assets	53.8	59.4
Total current assets	1,724.6	1,895.9
Marketable securities	408.3	192.8
Computer equipment, software, furniture and leasehold improvements, net	114.6	104.5
Purchased technologies, net	75.9	84.6
Goodwill	824.6	682.4
Deferred income taxes, net	128.3	135.8
Other assets	152.9	131.8
Assets, Total	3,429.2	3,227.8
Current liabilities [Abstract]:
Accounts payable	75.9	89.3
Accrued compensation	155.6	183.9
Accrued income taxes	14.2	14.4
Deferred revenue	558.1	582.3
Line of Credit, Current	110.0	0
Other accrued liabilities	71.5	84.2
Total current liabilities	985.3	954.1
Deferred revenue	155.6	136.9
Long term income taxes payable	184.4	174.8
Other liabilities	86.0	79.1
Stockholders' equity [Abstract]:
Preferred stock	0	0
Common stock and additional paid-in capital	1,438.9	1,365.4
Accumulated other comprehensive income	(6.4)	5.9
Retained earnings	585.4	511.6
Total stockholders' equity	2,017.9	1,882.9
Liabilities and Equity, Total	$ 3,429.2	$ 3,227.8