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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 9 Months Ended
--- | ---
Oct. 31, 2019 | Oct. 31, 2018
Operating activities: |  |
Net income (loss) | $ 82.7 | $ (145.5)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |
Depreciation, amortization and accretion | 96.4 | 69.8
Stock-based compensation expense | 257.4 | 175.5
Deferred income taxes | 47.9 | 16.5
Restructuring and other exit costs, net | 0.5 | 34.5
Other operating activities | 10.8 | 14.8
Changes in operating assets and liabilities |  |
Accounts receivable | (47.2) | 129.4
Prepaid expenses and other current assets | 37.6 | 8.3
Accounts payable and accrued liabilities | (94.2) | (181.0)
Deferred revenue | 328.8 | (73.8)
Accrued income taxes | (3.8) | 17.1
Net cash provided by operating activities | 716.9 | 65.6
Investing activities: |  |
Purchases of marketable securities | (19.9) | (135.3)
Sales of marketable securities | 22.4 | 61.3
Maturities of marketable securities | 5.0 | 194.9
Capital expenditures | (39.2) | (49.4)
Acquisitions, net of cash acquired | 0.0 | (34.1)
Other investing activities | (11.0) | 2.3
Net cash (used in) provided by investing activities | (42.7) | 39.7
Financing activities: |  |
Proceeds from issuance of common stock, net of issuance costs | 91.8 | 90.1
Taxes paid related to net share settlement of equity awards | (79.9) | (120.7)
Repurchases of common stock | (261.9) | (261.3)
Repayment of debt | (350.0) | 0.0
Net cash used in financing activities | (600.0) | (291.9)
Effect of exchange rate changes on cash and cash equivalents | (4.0) | (15.7)
Net increase (decrease) in cash and cash equivalents | 70.2 | (202.3)
Cash and cash equivalents at beginning of period | 886.0 | 1,078.0
Cash and cash equivalents at end of period | 956.2 | 875.7
Non-cash investing activities: |  |
Fair value of common stock issued as consideration for business combination | $ 0.0 | $ 44.8

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