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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jul. 30, 2022
Jul. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net (loss) income $ (5,326) $ 3,685
Adjustments to reconcile net (loss) income to net cash used in operating activities:    
Depreciation and amortization 4,025 4,052
Gain on sale of property, equipment and other assets (361) (106)
Share-based compensation 511 518
Equity in loss of affiliates 890 746
Provision for doubtful accounts, net of recovery 177 (421)
Deferred income taxes, net 12 (32)
Change in operating assets and liabilities (22,743) (9,461)
Net cash (used in) operating activities (22,815) (1,019)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (10,655) (1,283)
Proceeds from sales of property, equipment and other assets 365 149
Proceeds from sales or maturities of marketable securities 999 0
Purchases of equity and loans to equity investees (1,081) (718)
Net cash (used in) investing activities (10,372) (1,852)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 92,098 0
Payments on notes payable (67,970) 0
Principal payments on long-term obligations 0 (200)
Net cash provided by (used in) financing activities 24,128 (200)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 80 (132)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (8,979) (3,203)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 18,008 80,402
End of period 9,029 77,199
Cash paid for:    
Interest 75 0
Income taxes, net of refunds 685 980
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 0 46
Purchases of property and equipment included in accounts payable 3,326 868
Contributions of common stock under the ESPP $ 594 $ 597