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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 12 Months Ended
--- | ---
May 31, 2021 | May 31, 2020 | May 31, 2019
Cash Flows From Operating Activities |  |  |
Net income | $ 60,882 | $ 59,475 | $ 60,176
Adjustments to reconcile net income to net cash from operating activities: |  |  |
Depreciation and amortization | 21,041 | 18,396 | 17,624
Deferred income taxes | (640) | 1,601 | 1,197
Share-based compensation | 6,437 | 6,468 | 5,543
Changes in operating assets and liabilities, net of business acquisitions: |  |  |
Accounts receivable | (2,595) | (2,881) | (4,025)
Inventories | 2,450 | (10,011) | (10,437)
Prepaid expenses and other assets | (3,386) | (1,017) | (3,569)
Accounts payable | (3,206) | 6,745 | (1,461)
Accruals and other changes | 106 | 7,102 | (1,206)
Net Cash From Operating Activities | 81,089 | 85,878 | 63,842
Cash Flows Used for Investing Activities |  |  |
Purchase of property, equipment and other non-current intangible assets | (26,712) | (24,052) | (14,661)
Proceeds from the maturities of marketable securities | 764,597 | 406,731 | 339,225
Purchase of marketable securities | (792,678) | (458,300) | (437,324)
Business acquisitions, net of cash acquired | (50,771) | (13,164) | (6,388)
Net Cash Used for Investing Activities | (105,564) | (88,785) | (119,148)
Cash Flows From Financing Activities |  |  |
Exercise of stock options and other | 34,631 | 29,405 | 17,034
Payment of contingent consideration | (1,087) |  |
Repurchase of common stock |  |  | (3,135)
Net Cash From Financing Activities | 33,544 | 29,405 | 13,899
Effects of Foreign Exchange Rate on Cash | 264 | (1,917) | 21
Net Increase (Decrease) in Cash and Cash Equivalents | 9,333 | 24,581 | (41,386)
Cash and Cash Equivalents, Beginning of Year | 66,269 | 41,688 | 83,074
Cash and Cash Equivalents, End of Year | 75,602 | 66,269 | 41,688
Supplementary Cash Flow Information |  |  |
Income taxes paid, net of refunds | $ 14,966 | $ 7,364 | $ 13,027

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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Period Type: | duration