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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2022 | Jul. 31, 2021
Cash flows from operating activities: |  |
Net income | $ 78,536 | $ 76,397
Adjustments to reconcile net income to net cash used by operating activities: |  |
Depreciation and amortization | 16,229 | 15,644
Stock-based compensation expense | 7,757 | 7,158
Provision for doubtful accounts | 5,546 | 4,599
Gain on cash surrender value of life insurance policies | (2,029) | (531)
Gain on marketable securities | (58) | (5,242)
Deferred income taxes | 3,831 | 4,587
Change in other assets and liabilities: |  |
Deferred compensation | 23,469 | 17,861
Receivables due from clients | (52,347) | (68,787)
Income taxes and other receivables | (2,431) | 2,527
Prepaid expenses and other assets | (11,600) | (10,325)
Unearned compensation | 915 | (37,274)
Income taxes payable | 3,887 | 5,536
Accounts payable and accrued liabilities | (302,289) | (173,520)
Other | (1,302) | 825
Net cash used in operating activities | (231,886) | (160,545)
Cash flows from investing activities: |  |
Purchase of property and equipment | (16,646) | (9,010)
Purchase of marketable securities | (39,308) | (26,566)
Proceeds from sales/maturities of marketable securities | 15,612 | 23,108
Premium on company-owned life insurance policies | (276) | (277)
Proceeds from life insurance policies | 50 | 2,277
Dividends received from unconsolidated subsidiaries | 150 | 115
Net cash used in investing activities | (40,418) | (10,353)
Cash flows from financing activities: |  |
Payments of tax withholdings on restricted stock | (21,870) | (17,627)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 4,371 | 3,593
Dividends paid to shareholders | (8,703) | (6,866)
Principal payments on finance leases | (412) | (289)
Repurchases of common stock | (24,385) | (2,464)
Payments on life insurance policy loans | (50) |
Net cash used in financing activities | (51,049) | (23,653)
Effect of exchange rate changes on cash and cash equivalents | (14,933) | (6,923)
Net decrease in cash and cash equivalents | (338,286) | (201,474)
Cash and cash equivalents at beginning of period | 978,070 | 850,778
Cash and cash equivalents at end of the period | $ 639,784 | $ 649,304

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