Line of Credit - Narrative (Details) - USD ($)	12 Months Ended
	Apr. 30, 2016	May 02, 2015	May 03, 2014
Line of Credit Facility [Line Items]
Proceeds from borrowings	$ 71,000,000	$ 0	$ 38,000,000
Repayments in the period	19,000,000	$ 43,000,000	$ 33,500,000
Line of credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	100,000,000
Optional increase in borrowing capacity, up to	$ 50,000,000
Basis spread on variable rate	1.50%
Variable rate basis	LIBOR
Proceeds from borrowings	$ 71,000,000
Repayments in the period	19,600,000
Interest expense	600,000
Amount outstanding	57,000,000
Available borrowing capacity	$ 43,000,000