CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Operating Activities
Net income	$ 81.8us-gaap_NetIncomeLoss	$ 228.8us-gaap_NetIncomeLoss	$ 247.4us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization, and accretion	145.9us-gaap_DepreciationAndAmortization	128.9us-gaap_DepreciationAndAmortization	127.8us-gaap_DepreciationAndAmortization
Stock-based compensation expense	165.6us-gaap_ShareBasedCompensation	132.2us-gaap_ShareBasedCompensation	156.3us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based compensation	(0.5)	(9.1)	(12.9)
Restructuring charges, net	3.1	12.8	43.9
Other operating activities	16.2	(16.1)	6.7
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	(17.3)	72.3	(98.1)
Deferred income taxes	(18.8)	(49.4)	(28.3)
Prepaid expenses and other current assets	6.8	(20.3)	0.1
Accounts payable and accrued liabilities	130.8	(19.6)	(28.3)
Deferred revenue	245.2	66.0	113.3
Accrued income taxes	(50.7)	37.0	31.2
Net cash provided by operating activities	708.1	563.5	559.1
Investing Activities
Purchases of marketable securities	(1,355.1)	(1,214.2)	(1,397.7)
Sales of marketable securities	190.0	537.0	332.9
Maturities of marketable securities	969.0	742.1	764.8
Acquisitions, net of cash acquired	(630.0)	(176.1)	(263.7)
Capital expenditures	(75.5)us-gaap_PaymentsForCapitalImprovements	(64.2)us-gaap_PaymentsForCapitalImprovements	(56.4)us-gaap_PaymentsForCapitalImprovements
Other investing activities	(4.0)us-gaap_PaymentsToAcquireInvestments	(18.6)us-gaap_PaymentsToAcquireInvestments	(27.1)us-gaap_PaymentsToAcquireInvestments
Net cash used in investing activities	(905.6)	(194.0)	(647.2)
Financing Activities
Proceeds from issuance of common stock, net of issuance costs	135.4	288.2	220.2
Repurchase and retirement of common shares	(372.4)	(423.8)	(431.2)
Draws on line of credit	0us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit	110.0us-gaap_ProceedsFromLinesOfCredit
Proceeds from debt, net of discount	0	0	745.6
Repayments of line of credit	0us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit	(110.0)us-gaap_RepaymentsOfLinesOfCredit
Excess tax benefits from stock-based compensation	0.5	9.1	12.9
Other financing activities	(3.4)	0	(6.1)
Net cash (used in) provided by financing activities	(239.9)	(126.5)	541.4
Effect of exchange rate changes on cash and cash equivalents	(5.0)	(2.2)	2.0
Net (decrease) increase in cash and cash equivalents	(442.4)	240.8	455.3
Cash and cash equivalents at beginning of fiscal year	1,853.0	1,612.2	1,156.9
Cash and cash equivalents at end of fiscal year	1,410.6	1,853.0	1,612.2
Supplemental cash flow information:
Cash paid during the year for interest	20.4us-gaap_InterestPaid	20.5us-gaap_InterestPaid	0.4us-gaap_InterestPaid
Net cash paid during the year for income taxes	$ 63.4us-gaap_IncomeTaxesPaidNet	$ 75.7us-gaap_IncomeTaxesPaidNet	$ 59.7us-gaap_IncomeTaxesPaidNet

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The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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