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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2020 | Jul. 31, 2019
Cash flows from operating activities: |  |
Net (loss) income | $ (30,855) | $ 43,650
Adjustments to reconcile net (loss) income to net cash used by operating activities: |  |
Depreciation and amortization | 15,035 | 12,777
Stock-based compensation expense | 5,965 | 5,462
Provision for doubtful accounts | 4,626 | 3,549
Gain on cash surrender value of life insurance policies | (2,105) | (2,338)
Gain on marketable securities | (11,550) | (1,945)
Deferred income taxes | 4,072 | 1,974
Change in other assets and liabilities: |  |
Deferred compensation | 19,332 | 11,652
Receivables due from clients | 17,382 | (31,450)
Income taxes and other receivables | (2,889) | (3,176)
Prepaid expenses and other assets | (8,134) | (9,845)
Unearned compensation | (24,317) | (14,818)
Income taxes payable | (11,409) | (1,911)
Accounts payable and accrued liabilities | (123,781) | (175,709)
Other | 4,366 | 209
Net cash used in operating activities | (144,262) | (161,919)
Cash flows from investing activities: |  |
Purchase of property and equipment | (8,787) | (10,706)
Purchase of marketable securities | (19,216) | (1,600)
Proceeds from sales/maturities of marketable securities | 14,549 | 1,599
Premium on company-owned life insurance policies | (347) | (341)
Proceeds from life insurance policies | 591 | 1,673
Dividends received from unconsolidated subsidiaries |  | 166
Net cash used in investing activities | (13,210) | (9,209)
Cash flows from financing activities: |  |
Payments of tax withholdings on restricted stock | (4,442) | (8,591)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 3,371 | 4,313
Payments on life insurance policy loans | (596) | (943)
Principal payments on finance leases | (331) | (432)
Dividends paid to shareholders | (5,807) | (6,081)
Repurchases of common stock |  | (12,738)
Payment of contingent consideration from acquisitions |  | (455)
Net cash used in financing activities | (7,805) | (24,927)
Effect of exchange rate changes on cash and cash equivalents | 18,819 | (5,668)
Net decrease in cash and cash equivalents | (146,458) | (201,723)
Cash and cash equivalents at beginning of period | 689,244 | 626,360
Cash and cash equivalents at end of the period | $ 542,786 | $ 424,637

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