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CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Jan. 28, 2012
Jan. 29, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 8,994 $ 11,281
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13,398 14,980
Amortization of premium/discount on marketable securities 140 0
Loss (gain) on sale of property and equipment 11 53
Stock-based compensation 2,474 2,595
Excess tax benefits from stock-based compensation (30) (106)
Equity in losses of affiliates 0 36
Provision for doubtful accounts (125) (10)
Deferred income taxes, net (377) 2,172
Change in operating assets and liabilities (16,092) 6,373
Net cash provided by operating activities 8,393 37,374
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of property and equipment (12,633) (5,595)
Proceeds from sale of property and equipment 168 195
Purchases of marketable securities (10,968) (16,869)
Sales or maturities of marketable securities 13,925 0
Insurance recoveries on property and equipment 0 114
Other investing activities, net 0 2,095
Net cash used in investing activities (9,508) (20,060)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Borrowings on notes payable 782 0
Proceeds from exercise of stock options 431 1,223
Excess tax benefits from stock-based compensation 30 106
Principal payments on long-term obligations 0 (14)
Dividends paid (25,950) (24,794)
Net cash used in financing activities (24,707) (23,479)
EFFECT OF EXCHANGE RATE CHANGES ON CASH 66 111
NET DECREASE IN CASH AND CASH EQUIVALENTS (25,756) (6,054)
CASH AND CASH EQUIVALENTS:    
Beginning of period 54,308 63,603
End of period 28,552 57,549
Cash payments for:    
Interest 184 101
Income taxes, net of refunds 4,266 4,108
Supplemental schedule of non-cash investing and financing activities:    
Demonstration equipment transferred to inventory 38 774
Purchase of property and equipment included in accounts payable $ 827 $ 276