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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Oct. 27, 2012
Oct. 29, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 18,225 $ 7,327
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 7,717 8,879
Amortization 114 131
Amortization of premium/discount on marketable securities 93 101
Gain on sale of property and equipment (11) (7)
Share-based compensation 1,654 1,669
Excess tax benefits from share-based compensation (13) (10)
Provision for doubtful accounts (187) (337)
Deferred income taxes, net (258) (26)
Change in operating assets and liabilities 6,708 3,748
Net cash provided by operating activities 34,042 21,475
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (4,331) (6,236)
Proceeds from sale of property and equipment 119 147
Purchases of marketable securities (6,828) (7,739)
Proceeds from sales or maturities of marketable securities 5,992 4,975
Net cash used in investing activities (5,048) (8,853)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 0 782
Payments on notes payable (982) 0
Proceeds from exercise of stock options 439 330
Excess tax benefits from share-based compensation 13 10
Dividends paid (4,832) (4,588)
Net cash used in financing activities (5,362) (3,466)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 39 (4)
NET INCREASE IN CASH AND CASH EQUIVALENTS 23,671 9,152
CASH AND CASH EQUIVALENTS:    
Beginning of period 29,423 54,308
End of period 53,094 63,460
Cash payments (receipts) for:    
Interest 149 93
Income taxes, net 1,783 1,290
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 367 32
Purchase of property and equipment included in accounts payable $ 706 $ 568