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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Oct. 31, 2016 | Oct. 31, 2015
Operating activities: |  |
Net loss | $ (408.7) | $ (293.3)
Adjustments to reconcile net loss to net cash provided by operating activities: |  |
Depreciation, amortization and accretion | 104.5 | 109.7
Stock-based compensation expense | 162.5 | 141.1
Deferred income taxes | (39.6) | 221.9
Restructuring charges and other facility exit costs, net | 71.5 | 0.0
Other operating activities | 3.4 | (10.6)
Changes in operating assets and liabilities, net of acquisitions: |  |
Accounts receivable | 393.8 | 97.4
Prepaid expenses and other current assets | (12.7) | (5.5)
Accounts payable and accrued liabilities | (71.9) | (75.1)
Deferred revenue | 15.6 | 54.5
Accrued income taxes | (64.3) | 4.0
Net cash provided by operating activities | 154.1 | 244.1
Investing activities: |  |
Purchases of marketable securities | (1,106.4) | (1,827.9)
Sales of marketable securities | 544.7 | 263.0
Maturities of marketable securities | 1,012.6 | 970.7
Capital expenditures | (65.1) | (41.8)
Acquisitions, net of cash acquired | (85.2) | (104.6)
Other investing activities | (14.8) | (15.5)
Net cash provided by (used in) investing activities | 285.8 | (756.1)
Financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs | 102.2 | 99.3
Taxes paid related to net share settlement of equity awards | (58.9) | (42.3)
Repurchases of common stock | (397.6) | (357.7)
Proceeds from debt, net of discount | 0.0 | 748.3
Other financing activities | 0.0 | (6.3)
Net cash (used in) provided by financing activities | (354.3) | 441.3
Effect of exchange rate changes on cash and cash equivalents | (2.1) | (2.4)
Net increase (decrease) in cash and cash equivalents | 83.5 | (73.1)
Cash and cash equivalents at beginning of period | 1,353.0 | 1,410.6
Cash and cash equivalents at end of period | $ 1,436.5 | $ 1,337.5

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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- Definition Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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