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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2022 | Apr. 30, 2021 | Apr. 30, 2020
Cash flows from operating activities: |  |  |
Net income | $ 330,845 | $ 115,562 | $ 107,017
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 63,521 | 61,845 | 55,311
Stock-based compensation expense | 29,210 | 27,157 | 22,818
Impairment of right to use assets | 7,392 |  | 2,282
Impairment of fixed assets | 1,915 |  | 372
Provision for doubtful accounts | 21,552 | 15,763 | 14,644
Gain on cash surrender value of life insurance policies | (5,819) | (13,017) | (6,551)
Loss (gain) on marketable securities | 11,978 | (38,529) | 2,066
Deferred income taxes | (16,963) | (14,140) | (9,330)
Change in other assets and liabilities: |  |  |
Deferred compensation | 27,197 | 64,005 | 23,496
Receivables due from clients | (138,627) | (67,331) | 34,152
Income taxes and other receivables | 3,969 | 5,798 | (6,421)
Prepaid expenses and other assets | (9,534) | (3,902) | (956)
Unearned compensation | (23,425) | (32,935) | 300
Income taxes payable | 12,751 | (1,824) | 1,246
Accounts payable and accrued liabilities | 191,447 | 122,687 | (6,011)
Other | (5,751) | 10,294 | 1,914
Net cash provided by operating activities | 501,658 | 251,433 | 236,349
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (49,406) | (31,122) | (41,460)
Purchase of marketable securities | (82,015) | (103,499) | (83,563)
Proceeds from sales/maturities of marketable securities | 92,472 | 69,683 | 47,936
Cash paid for acquisitions, net of cash acquired | (133,802) |  | (108,602)
Premium on company-owned life insurance policies | (15,218) | (15,353) | (15,699)
Proceeds from life insurance policies | 3,382 | 18,707 | 2,280
Dividends received from unconsolidated subsidiaries | 255 | 205 | 346
Net cash used in investing activities | (184,332) | (61,379) | (198,762)
Cash flows from financing activities: |  |  |
Repurchases of common stock | (96,258) | (30,387) | (92,446)
Payments of tax withholdings on restricted stock | (18,532) | (4,989) | (8,993)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 6,919 | 5,706 | 7,684
Payments on life insurance policy loans | (178) | (12,279) | (943)
Principal payments on finance leases | (1,157) | (1,324) | (1,833)
Dividends paid to shareholders | (26,786) | (22,498) | (22,798)
Dividends paid to noncontrolling interest | (1,452) | (1,115) | (2,110)
Proceeds from long term debt |  |  | 1,045,500
Principal payments on long term debt |  |  | (876,875)
Payment of debt issuance costs |  |  | (3,050)
Payment of contingent consideration from acquisitions |  |  | (455)
Net cash (used in) provided by financing activities | (137,444) | (66,886) | 43,681
Effect of exchange rate changes on cash and cash equivalents | (52,590) | 38,366 | (18,384)
Net increase in cash and cash equivalents | 127,292 | 161,534 | 62,884
Cash and cash equivalents at beginning of year | 850,778 | 689,244 | 626,360
Cash and cash equivalents at end of the period | 978,070 | 850,778 | 689,244
Supplemental cash flow information: |  |  |
Cash used to pay interest | 24,607 | 25,207 | 12,526
Cash used to pay income taxes, net of refunds | $ 107,602 | $ 55,317 | $ 54,914

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