FAIR VALUE MEASUREMENTS OF FINANCIAL INSTRUMENTS (Details) (Derivatives designated as hedges, USD $) In Millions, unless otherwise specified	1 Months Ended
	Aug. 31, 2005	Apr. 28, 2012	Apr. 30, 2011	Aug. 02, 2005
Derivatives designated as hedges
Interest Rate Swap Agreement
Period of interest payments (in years)	7 years
Fixed rate of interest (as a percent)				4.70%
Notional principal amount				$ 50.0
Base rate (in months)	one-month London Interbank Offered Rate ("LIBOR")
Spread on base rate (as a percent)		1.00%
Effective rate on notional amount (as a percent)		5.70%
Libor rate (as a percent)		0.24%	0.21%