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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Jan. 29, 2022
Jan. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 1,709 $ 10,669
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Depreciation and amortization 11,544 12,848
Gain on sale of property, equipment and other assets (737) (244)
Share-based compensation 1,503 1,563
Equity in loss of investees 1,966 1,740
Provision for doubtful accounts (600) 1,551
Deferred income taxes, net 151 (21)
Change in operating assets and liabilities (41,000) 20,115
Net cash (used in) provided by operating activities (25,464) 48,221
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (10,024) (6,935)
Proceeds from sales of property, equipment and other assets 838 470
Purchases of marketable securities (4,045) 0
Proceeds from sales or maturities of marketable securities 0 982
Purchases of and loans to equity investees (6,695) (1,328)
Net cash used in investing activities (19,926) (6,811)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Principal payments on long-term obligations (200) (431)
Payments for common shares repurchased (3,000) 0
Proceed from exercise of stock options 8 0
Tax payments related to RSU issuances (199) (125)
Net cash used in financing activities (3,391) (556)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 98 (505)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (48,683) 40,349
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:    
Beginning of period 80,402 40,412
End of period 31,719 80,761
Supplemental disclosures of cash flow information:    
Interest 0 195
Income taxes, net of refunds 1,601 1,491
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 53 56
Purchases of property and equipment included in accounts payable 1,795 527
Contributions of common stock under the ESPP $ 1,211 $ 565