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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Cash flows from operating activities: |  |  |
Net income | $ 115,562 | $ 107,017 | $ 104,796
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 61,845 | 55,311 | 46,489
Stock-based compensation expense | 27,157 | 22,818 | 23,385
Tradename write-offs |  |  | 106,555
Write-off of long-lived assets |  | 2,654 |
Provision for doubtful accounts | 15,763 | 14,644 | 14,260
Gain on cash surrender value of life insurance policies | (13,017) | (6,551) | (6,160)
(Gain) loss on marketable securities | (38,529) | 2,066 | (8,134)
Deferred income taxes | (14,140) | (9,330) | (27,796)
Change in other assets and liabilities: |  |  |
Deferred compensation | 64,005 | 23,496 | 18,478
Receivables due from clients | (67,331) | 34,152 | (30,625)
Income taxes and other receivables | 5,798 | (6,421) | 1,409
Prepaid expenses and other assets | (3,902) | (956) | (148)
Unearned compensation | (32,935) | 300 | (7,299)
Income taxes payable | (1,824) | 1,246 | 213
Accounts payable and accrued liabilities | 122,687 | (6,011) | 28,398
Other | 10,294 | 1,914 | (5,016)
Net cash provided by operating activities | 251,433 | 236,349 | 258,805
Cash flows from investing activities: |  |  |
Purchase of property and equipment | (31,122) | (41,460) | (46,682)
Purchase of marketable securities | (103,499) | (83,563) | (9,476)
Proceeds from sales/maturities of marketable securities | 69,683 | 47,936 | 13,781
Cash paid for acquisitions, net of cash acquired |  | (108,602) |
Premium on company-owned life insurance policies | (15,353) | (15,699) | (34,862)
Proceeds from life insurance policies | 18,707 | 2,280 | 7,632
Dividends received from unconsolidated subsidiaries | 205 | 346 | 140
Net cash used in investing activities | (61,379) | (198,762) | (69,467)
Cash flows from financing activities: |  |  |
Repurchases of common stock | (30,387) | (92,446) | (37,372)
Payments of tax withholdings on restricted stock | (4,989) | (8,993) | (20,698)
Proceeds from issuance of common stock upon exercise of employee stock options and in connection with an employee stock purchase plan | 5,706 | 7,684 | 7,272
Borrowings under life insurance policies |  |  | 31,870
Payments on life insurance policy loans | (12,279) | (943) | (5,316)
Principal payments on finance leases | (1,324) | (1,833) |
Dividends paid to shareholders | (22,498) | (22,798) | (23,459)
Dividends paid to noncontrolling interest | (1,115) | (2,110) | (2,255)
Proceeds from long term debt |  | 1,045,500 | 226,875
Principal payments on long term debt |  | (876,875) | (238,906)
Payment of debt issuance costs |  | (3,050) | (2,181)
Payment of contingent consideration from acquisitions |  | (455) | (455)
Net cash (used in) provided by financing activities | (66,886) | 43,681 | (64,625)
Effect of exchange rate changes on cash and cash equivalents | 38,366 | (18,384) | (19,201)
Net increase in cash and cash equivalents | 161,534 | 62,884 | 105,512
Cash and cash equivalents at beginning of year | 689,244 | 626,360 | 520,848
Cash and cash equivalents at end of the period | 850,778 | 689,244 | 626,360
Supplemental cash flow information: |  |  |
Cash used to pay interest | 25,207 | 12,526 | 14,188
Cash used to pay income taxes, net of refunds | $ 55,317 | $ 54,914 | $ 58,408

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- Definition Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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