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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified | 9 Months Ended
--- | ---
Oct. 31, 2014 | Oct. 31, 2013
Operating activities: |  |
Net income | $ 70.3 | $ 174.9
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation, amortization and accretion | 109.9 | 95.7
Stock-based compensation expense | 116.5 | 96.1
Excess tax benefits from stock-based compensation | 0 | 0.8
Restructuring charges, net | 3.1 | 6.5
Other operating activities | 9.5 | (3.1)
Changes in operating assets and liabilities, net of business combinations | 141.6 | 9.1
Net cash provided by operating activities | 450.9 | 380.0
Investing activities: |  |
Purchases of marketable securities | (899.0) | (969.8)
Sales of marketable securities | 160.7 | 329.9
Maturities of marketable securities | 623.2 | 395.1
Capital expenditures | (60.0) | (55.0)
Acquisitions, net of cash acquired | (603.8) | (68.0)
Other investing activities | 1.2 | (15.7)
Net cash used in investing activities | (777.7) | (383.5)
Financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs | 129.6 | 183.4
Repurchase and retirement of common shares | (307.6) | (318.7)
Excess tax benefits from stock-based compensation | 0 | (0.8)
Other financing activities | (1.7) | 0
Net cash used in financing activities | (179.7) | (136.1)
Effect of exchange rate changes on cash and cash equivalents | (1.5) | 0.8
Net decrease in cash and cash equivalents | (508.0) | (138.8)
Cash and cash equivalents at beginning of fiscal year | 1,853.0 | 1,612.2
Cash and cash equivalents at end of period | $ 1,345.0 | $ 1,473.4

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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