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Consolidated Statements of Cash Flows - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jan. 29, 2022 | Jan. 30, 2021
Operating activities |  |
Net (loss) income | $ (11,397) | $ 12,373
Adjustments to reconcile net (loss) income to cash (used in) provided by operating activities: |  |
Depreciation and amortization | 47,437 | 8,650
(Income) loss from equity method investments, net | (799) | 10,891
Amortization of debt issuance costs | 386 |
Realized gain from sale of available-for-sale investments |  | (11)
Provision for doubtful accounts | (20) | (145)
Other non-cash expense (income) | 440 | (473)
Non-cash lease expense | 5,033 | 3,592
Loss on foreign currency transactions | 34 | 1
Deferred income taxes | (1,195) | (897)
Stock-based compensation | 3,957 | 4,754
Loss on disposal of property and equipment | 5,063 | 2
Amortization of debt securities | 117 | 143
Changes in operating assets and liabilities, net of acquisitions: |  |
Accounts receivable | 21,901 | 47,184
Unbilled receivables and retentions | (25,597) | 14,753
Inventories | (21,590) | (7,569)
Income taxes receivable | (26,208) |
Prepaid expenses and other assets | 1,789 | (1,622)
Accounts payable | (10,720) | (3,346)
Other liabilities | (11,807) | (9,318)
Net cash (used in) provided by operating activities | (23,176) | 78,962
Investing activities |  |
Acquisition of property and equipment | (17,064) | (8,472)
Equity method investments | (6,884) | (2,150)
Business acquisitions, net of cash acquired | (46,150) |
Redemptions of available-for-sale investments | 35,851 | 130,066
Purchases of available-for-sale investments | (2,987) | (125,644)
Other | 225 |
Net cash used in investing activities | (37,009) | (6,200)
Financing activities |  |
Principal payments of loan | (7,500) |
Holdback and retention payments for business acquisition | (5,991) | (1,492)
Tax withholding payment related to net settlement of equity awards | (1,176) | (1,955)
Exercise of stock options | 2,776 | 86
Other | (23) |
Net cash used in financing activities | (11,914) | (3,361)
Effects of currency translation on cash and cash equivalents | (613) |
Net (decrease) increase in cash, cash equivalents, and restricted cash | (72,712) | 69,401
Cash, cash equivalents and restricted cash at beginning of period | 157,063 | 255,142
Cash, cash equivalents and restricted cash at end of period | 84,351 | 324,543
Cash paid, net during the period for: |  |
Income taxes | 1,923 | 2,364
Interest | 3,465 |
Non-cash activities |  |
Unrealized loss on available-for-sale investments, net of deferred tax benefit of $1 and $2 for the nine months ended January 29, 2022 and January 30, 2021, respectively | 6 | 56
Change in foreign currency translation adjustments | (3,771) | 75
Issuances of inventory to property and equipment, ISR in-service assets | 16,680 |
Acquisitions of property and equipment included in accounts payable | $ 626 | $ 746

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