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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Jul. 30, 2017	Jul. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 4,984	$ 5,313
Other comprehensive income
Unrealized holding gains on investments	44	84
Reclassification adjustment for realized loss included in net income		12
Total other comprehensive income	44	96
Comprehensive income	$ 5,028	$ 5,409

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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 of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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