CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Operating Activities
Net loss	$ (566.9)	$ (582.1)	$ (330.5)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization, and accretion	108.4	139.2	145.8
Stock-based compensation expense	261.4	221.8	197.2
Deferred income taxes	(39.1)	(38.8)	235.9
Restructuring charges and other facility exit costs, net	94.1	80.5	0.0
Other operating activities	7.3	(7.7)	(25.0)
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	13.3	201.5	(195.5)
Prepaid expenses and other current assets	(9.9)	(13.5)	(2.8)
Accounts payable and accrued liabilities	(13.9)	2.7	24.9
Deferred revenue	168.3	267.0	360.5
Accrued income taxes	(22.1)	(100.9)	3.5
Net cash provided by operating activities	0.9	169.7	414.0
Investing Activities
Purchases of marketable securities	(514.0)	(1,867.9)	(2,250.1)
Sales of marketable securities	489.0	1,257.7	329.4
Maturities of marketable securities	594.3	1,057.2	1,376.6
Acquisitions, net of cash acquired	0.0	(85.2)	(148.5)
Capital expenditures	(50.7)	(76.0)	(72.4)
Other investing activities	(12.2)	(13.8)	(44.5)
Net cash provided by (used in) investing activities	506.4	272.0	(809.5)
Financing Activities
Proceeds from issuance of common stock	94.4	119.6	110.8
Taxes paid related to net share settlement of equity awards	(143.1)	(76.2)	(51.6)
Repurchase and retirement of common shares	(699.0)	(621.7)	(458.0)
Proceeds from debt, net of discount	496.9	0.0	748.3
Repayments of debt	(400.0)	0.0	0.0
Other financing activities	(5.8)	0.0	(6.3)
Net cash (used in) provided by financing activities	(656.6)	(578.3)	343.2
Effect of exchange rate changes on cash and cash equivalents	14.2	(3.3)	(5.3)
Net decrease in cash and cash equivalents	(135.1)	(139.9)	(57.6)
Cash and cash equivalents at beginning of fiscal year	1,213.1	1,353.0	1,410.6
Cash and cash equivalents at end of fiscal year	1,078.0	1,213.1	1,353.0
Supplemental cash flow information:
Cash paid during the year for interest	54.6	47.6	34.7
Net cash paid during the year for income taxes	$ 84.5	$ 77.7	$ 59.1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration