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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 01, 2015	Jan. 26, 2014	Feb. 01, 2015	Jan. 26, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 3,812us-gaap_NetIncomeLoss	$ 8,381us-gaap_NetIncomeLoss	$ 10,157us-gaap_NetIncomeLoss	$ 14,707us-gaap_NetIncomeLoss
Other comprehensive gain (loss)
Unrealized gains (losses) on investments	22us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(14)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(6)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	(128)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Total other comprehensive gain (loss)	22us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(14)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(6)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	(128)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income	$ 3,834us-gaap_ComprehensiveIncomeNetOfTax	$ 8,367us-gaap_ComprehensiveIncomeNetOfTax	$ 10,151us-gaap_ComprehensiveIncomeNetOfTax	$ 14,579us-gaap_ComprehensiveIncomeNetOfTax

X

- Definition

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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