FAIR VALUE MEASUREMENTS (Details) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Jan. 26, 2013		Apr. 28, 2012
Recorded Value
Assets:
Cash and cash equivalents	$ 73,375	[1]	$ 86,797	[1]
Assets related to deferred compensation plan	3,972		3,965
Total assets at fair value	77,347		90,762
Liabilities:
Liabilities related to deferred compensation plan	3,044		2,798
Total liabilities at fair value	3,044		2,798
Quoted prices in active markets for identical instruments (Level 1)
Assets:
Cash and cash equivalents	73,375	[1]	86,797	[1]
Assets related to deferred compensation plan	3,972		3,965
Total assets at fair value	77,347		90,762
Liabilities:
Liabilities related to deferred compensation plan	3,044		2,798
Total liabilities at fair value	3,044		2,798
Quoted prices in active markets for similar instruments (Level 2)
Assets:
Cash and cash equivalents	0	[1]	0	[1]
Assets related to deferred compensation plan	0		0
Total assets at fair value	0		0
Liabilities:
Liabilities related to deferred compensation plan	0		0
Total liabilities at fair value	0		0
Other unobservable inputs (Level 3)
Assets:
Cash and cash equivalents	0	[1]	0	[1]
Assets related to deferred compensation plan	0		0
Total assets at fair value	0		0
Liabilities:
Liabilities related to deferred compensation plan	0		0
Total liabilities at fair value	$ 0		$ 0

[1] Includes cash, money-market investments and certificates of deposit.