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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 29, 2011
Oct. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 7,327 $ 9,450
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 8,879 9,777
Amortization 131 152
Amortization of premium/discount on marketable securities 101 0
Loss (gain) on sale of property and equipment (7) 33
Excess tax benefits from stock-based compensation (10) (30)
Stock-based compensation 1,669 1,733
Equity in losses of affiliates 0 36
Provision for doubtful accounts (337) 249
Deferred income taxes, net (26) 278
Change in operating assets and liabilities 3,748 6,456
Net cash provided by operating activities 21,475 28,134
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchase of property and equipment (6,236) (3,195)
Purchases of marketable securities (7,739) 0
Proceeds from sales and maturities of marketable securities 4,975 0
Insurance recoveries on property and equipment 0 114
Proceeds from sale of property and equipment 147 168
Other investing activities, net 0 482
Net cash used in investing activities (8,853) (2,431)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 782 0
Proceeds from exercise of stock options 330 660
Excess tax benefits from stock-based compensation 10 30
Principal payments on long-term obligations 0 (14)
Dividends paid (4,588) (24,794)
Net cash used in financing activities (3,466) (24,118)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (4) 1
INCREASE IN CASH AND CASH EQUIVALENTS 9,152 1,586
CASH AND CASH EQUIVALENTS:    
Beginning of period 54,308 63,603
End of period 63,460 65,189
Cash payments for:    
Interest 93 45
Income taxes, net of refunds 1,290 (2,213)
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 32 421
Purchase of property and equipment included in accounts payable $ 568 $ 351