INCOME TAXES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Nov. 01, 2014	May 03, 2014	Oct. 26, 2013	Nov. 01, 2014	Oct. 26, 2013
Valuation Allowance [Line Items]
Deferred Federal and State income tax expense (benefit)		$ 31.7
Federal tax expense (benefit)				(8.1)
State tax expense (benefit)				(2.7)
Research tax credit carryforwards	0.6			0.6
Income tax expense	8.7		1.4	15.7	2.7
Effective income tax rate	25.10%		6.60%	24.90%	7.50%
Unrecognized tax benefits, income tax penalties and interest accrued	0.1			0.1
Total unrecognized tax benefit	0.7			0.7
Change in unrecognized tax benefits				0
Malta | Investment Tax Credit Carryforward
Valuation Allowance [Line Items]
Investment tax credit on qualified expenditures, percent	30.00%			30.00%
Unused credits	20.7			20.7
Valuation allowance	8.4			8.4
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards	25.0			25.0
State
Valuation Allowance [Line Items]
Operating loss carryforwards	93.0			93.0
Foreign
Valuation Allowance [Line Items]
Operating loss carryforwards	11.0			11.0
Domestic federal and state
Valuation Allowance [Line Items]
Valuation allowances against deferred tax assets	$ 2.6	$ 2.6		$ 2.6