DEBT AND CREDIT AGREEMENT (Details) (Line of credit, USD $)	3 Months Ended
	Jul. 28, 2012
Line of credit
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000,000
Possible increase of maximum borrowing capacity subject to customary conditions and lender approval	25,000,000
Basis spread on LIBOR variable rate	1.50%
Variable interest rate description	LIBOR
Increase, additional borrowings	8,500,000
Interest expense	256,000
Amount outstanding	56,500,000
Remaining borrowing capacity	$ 18,500,000