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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Jan. 29, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 6,347	$ 4,862	$ 16,136	$ 13,333
Unrealized gains (losses) on investments
Unrealized holding gains (losses) on investments	(13)	(194)	75	(312)
Reclassification adjustment for realized loss included in net income		71	12	127
Total other comprehensive income (loss)	(13)	(123)	87	(185)
Comprehensive income	$ 6,334	$ 4,739	$ 16,223	$ 13,148

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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