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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Oct. 31, 2020 | Oct. 31, 2019
Cash flows from operating activities: |  |
Net income (loss) | $ (2,777) | $ 86,682
Adjustments to reconcile net (loss) income to net cash used by operating activities: |  |
Depreciation and amortization | 30,333 | 25,492
Stock-based compensation expense | 13,195 | 11,520
Provision for doubtful accounts | 7,993 | 7,150
Gain on cash surrender value of life insurance policies | (3,899) | (4,209)
Gain on marketable securities | (12,025) | (3,121)
Deferred income taxes | 5,071 | 6,402
Change in other assets and liabilities: |  |
Deferred compensation | 22,670 | 14,817
Receivables due from clients | (46,221) | (60,556)
Income taxes and other receivables | (13,755) | (13,468)
Prepaid expenses and other assets | (4,135) | (8,140)
Unearned compensation | (33,630) | (26,576)
Income taxes payable | (11,964) | (6,139)
Accounts payable and accrued liabilities | (52,622) | (133,444)
Other | 9,716 | (508)
Net cash used in operating activities | (92,050) | (104,098)
Cash flows from investing activities: |  |
Purchase of property and equipment | (15,329) | (23,817)
Purchase of marketable securities | (40,572) | (3,826)
Proceeds from sales/maturities of marketable securities | 32,343 | 3,016
Premium on company-owned life insurance policies | (361) | (355)
Proceeds from life insurance policies | 591 | 1,999
Dividends received from unconsolidated subsidiaries |  | 166
Net cash used in investing activities | (23,328) | (22,817)
Cash flows from financing activities: |  |
Proceeds from long term debt |  | 50,000
Payments of tax withholdings on restricted stock | (4,550) | (8,725)
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 | (664) | (927)
Dividends paid to shareholders | (11,414) | (11,709)
Dividends - noncontrolling interest | (558) | (1,046)
Repurchases of common stock | (22,770) | (61,929)
Payment of contingent consideration from acquisitions |  | (455)
Net cash used in financing activities | (37,181) | (31,421)
Effect of exchange rate changes on cash and cash equivalents | 16,424 | (3,601)
Net decrease in cash and cash equivalents | (136,135) | (161,937)
Cash and cash equivalents at beginning of period | 689,244 | 626,360
Cash and cash equivalents at end of the period | $ 553,109 | $ 464,423

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