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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 25, 2014
Jan. 26, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 20,380 $ 20,935
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 10,678 11,614
Amortization 274 171
Amortization of premium/discount on marketable securities 170 140
(Gain) loss on sale of property and equipment (90) 33
Share-based compensation 2,206 2,344
Excess tax benefits from share-based compensation (106) (61)
Provision for doubtful accounts (47) (197)
Deferred income taxes, net 619 (258)
Change in operating assets and liabilities 5,159 (1,466)
Net cash provided by operating activities 39,243 33,255
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (9,421) (6,799)
Proceeds from sale of property and equipment 182 175
Purchases of marketable securities (9,432) (13,301)
Proceeds from sales or maturities of marketable securities 8,000 12,820
Acquisition, net of cash acquired (1,298) 0
Net cash used in investing activities (11,969) (7,105)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payments on notes payable 0 (1,460)
Proceeds from exercise of stock options 4,607 1,146
Excess tax benefits from share-based compensation 106 61
Principal payments on long-term obligations 3,682 0
Dividends paid (12,808) (30,859)
Net cash used in financing activities (11,777) (31,112)
EFFECT OF EXCHANGE RATE CHANGES ON CASH (211) 43
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS 15,286 (4,919)
CASH AND CASH EQUIVALENTS:    
Beginning of period 40,628 29,423
End of period 55,914 24,504
Cash payments for:    
Interest 98 204
Income taxes, net of refunds 11,365 5,579
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 249 542
Purchases of property and equipment included in accounts payable 446 948
Contributions of common stock under the employee stock purchase plan $ 1,552 $ 1,482