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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 26, 2013
Jan. 28, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 20,935 $ 8,994
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 11,614 13,209
Amortization 171 189
Amortization of premium/discount on marketable securities 140 140
Loss on sale of property and equipment 33 11
Share-based compensation 2,344 2,474
Excess tax benefits from share-based compensation (61) (30)
Provision for doubtful accounts (197) (125)
Deferred income taxes, net (258) (377)
Change in operating assets and liabilities (1,466) (16,092)
Net cash provided by operating activities 33,255 8,393
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (6,799) (12,633)
Proceeds from sale of property and equipment 175 168
Purchases of marketable securities (13,301) (10,968)
Proceeds from sales or maturities of marketable securities 12,820 13,925
Net cash used in investing activities (7,105) (9,508)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 0 782
Payments on notes payable (1,460) 0
Proceeds from exercise of stock options 1,146 431
Excess tax benefits from share-based compensation 61 30
Dividends paid (30,859) (25,950)
Net cash used in financing activities (31,112) (24,707)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 43 66
NET DECREASE IN CASH AND CASH EQUIVALENTS (4,919) (25,756)
CASH AND CASH EQUIVALENTS:    
Beginning of period 29,423 54,308
End of period 24,504 28,552
Cash payments for:    
Interest 204 184
Income taxes, net 5,579 4,266
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 542 38
Purchases of property and equipment included in accounts payable $ 948 $ 827