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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 25, 2014	Jan. 31, 2015	Jan. 25, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 561us-gaap_NetIncomeLoss	$ 2,871us-gaap_NetIncomeLoss	$ 17,043us-gaap_NetIncomeLoss	$ 20,380us-gaap_NetIncomeLoss
Other comprehensive loss:
Cumulative translation adjustments	(1,386)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(335)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(2,501)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	(12)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Unrealized gain (loss) on available-for-sale securities, net of tax	8us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	7us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	(3)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	(13)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Total other comprehensive loss, net of tax	(1,378)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(328)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(2,504)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(25)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive (loss) income	$ (817)us-gaap_ComprehensiveIncomeNetOfTax	$ 2,543us-gaap_ComprehensiveIncomeNetOfTax	$ 14,539us-gaap_ComprehensiveIncomeNetOfTax	$ 20,355us-gaap_ComprehensiveIncomeNetOfTax

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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