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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jan. 25, 2020 | Jan. 26, 2019
Operating activities |  |
Net income | $ 23,576 | $ 41,716
Gain on sale of business, net of tax |  | (8,452)
Loss from discontinued operations, net of tax |  | 2,511
Net income from continuing operations | 23,576 | 35,775
Adjustments to reconcile net income from continuing operations to cash provided by operating activities from continuing operations: |  |
Depreciation and amortization | 7,107 | 5,530
Loss from equity method investment | 3,410 | 2,071
Provision for doubtful accounts | (2) | (33)
Other non-cash gain, net | (719) |
Non-cash lease expense | 3,453 |
Gains on foreign currency transactions |  | (10)
Deferred income taxes | (946) | (1,214)
Stock-based compensation | 4,751 | 5,599
(Gain) loss on sale of property and equipment | (71) | 51
Amortization of debt securities | (1,291) | (941)
Changes in operating assets and liabilities, net of acquisitions: |  |
Accounts receivable | 3,245 | 22,817
Unbilled receivables and retentions | (24,364) | (34,760)
Inventories | (10,766) | (12,954)
Income tax receivable | 821 |
Prepaid expenses and other assets | 216 | (1,791)
Accounts payable | (1,301) | (10,645)
Other liabilities | 7,947 | (2,598)
Net cash provided by operating activities of continuing operations | 15,066 | 6,897
Investing activities |  |
Acquisition of property and equipment | (8,504) | (6,806)
Equity method investments | (9,551) |
Business acquisition, net of cash acquired | (18,641) |
Proceeds from sale of business |  | 31,994
Proceeds from sale of property and equipment | 81 |
Redemptions of held-to-maturity investments | 166,917 | 191,455
Purchases of held-to-maturity investments | (162,517) | (211,120)
Redemptions of available-for-sale investments | 41,150 | 2,250
Purchases of available-for-sale investments | (59,297) |
Net cash (used in) provided by investing activities from continuing operations | (50,362) | 7,773
Financing activities |  |
Principal payments of capital lease obligations |  | (154)
Tax withholding payment related to net settlement of equity awards | (1,009) | (1,033)
Exercise of stock options | 93 | 71
Net cash used in financing activities from continuing operations | (916) | (1,116)
Discontinued operations |  |
Operating activities of discontinued operations | 0 | (7,250)
Investing activities of discontinued operations | 0 | (452)
Net cash used in discontinued operations |  | (7,702)
Net (decrease) increase in cash, cash equivalents, and restricted cash | (36,212) | 5,852
Cash, cash equivalents, and restricted cash at beginning of period | 172,708 | 143,517
Cash, cash equivalents, and restricted cash at end of period | 136,496 | 149,369
Cash paid, net during the period for: |  |
Income taxes | 518 | 6,777
Non-cash activities |  |
Unrealized gain on investments, net of deferred tax expense of $51 |  | 57
Change in foreign currency translation adjustments | 67 | (32)
Acquisitions of property and equipment included in accounts payable | $ 263 | $ 58

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