CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
Jan. 31, 2015	Jan. 25, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 17,043us-gaap_NetIncomeLoss	$ 20,380us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	11,056us-gaap_Depreciation	10,678us-gaap_Depreciation
Amortization	169us-gaap_AdjustmentForAmortization	274us-gaap_AdjustmentForAmortization
Amortization of premium/discount on marketable securities	132	170
Gain on sale of property, equipment and other assets	(1,192)	(90)
Share-based compensation	2,341us-gaap_ShareBasedCompensation	2,206us-gaap_ShareBasedCompensation
Excess tax benefits from share-based compensation	(35)	(106)
Provision for doubtful accounts	(295)us-gaap_ProvisionForDoubtfulAccounts	(47)us-gaap_ProvisionForDoubtfulAccounts
Deferred income taxes, net	353us-gaap_DeferredIncomeTaxExpenseBenefit	619us-gaap_DeferredIncomeTaxExpenseBenefit
Change in operating assets and liabilities	(2,255)	5,159
Net cash provided by operating activities	27,317	39,243
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(15,328)	(9,421)
Proceeds from sale of property, equipment and other assets	4,011	182
Purchases of marketable securities	(10,647)	(9,432)
Proceeds from sales or maturities of marketable securities	10,256	8,000
Acquisitions, net of cash acquired	(6,223)	(1,298)
Net cash used in investing activities	(17,931)	(11,969)
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments on notes payable	(42)us-gaap_RepaymentsOfNotesPayable	0us-gaap_RepaymentsOfNotesPayable
Proceeds from exercise of stock options	2,424	4,607
Excess tax benefits from share-based compensation	35	106
Principal payments on long-term obligations	1,185us-gaap_RepaymentsOfLongTermDebt	3,682us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(13,016)us-gaap_PaymentsOfDividendsCommonStock	(12,808)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities	(11,784)	(11,777)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(905)	(211)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(3,303)	15,286
CASH AND CASH EQUIVALENTS:
Beginning of period	45,054	40,628
End of period	41,751	55,914
Cash payments for:
Interest	256us-gaap_InterestPaid	98us-gaap_InterestPaid
Income taxes, net of refunds	9,961us-gaap_IncomeTaxesPaidNet	11,365us-gaap_IncomeTaxesPaidNet
Supplemental schedule of non-cash investing and financing activities:
Demonstration equipment transferred to inventory	69	249
Purchase of property and equipment included in accounts payable	1,025	446
Contributions of common stock under the employee stock purchase plan	$ 1,737us-gaap_StockIssued1	$ 1,552us-gaap_StockIssued1

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