INCOME TAXES (Details) - USD ($) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 31, 2017	Apr. 29, 2018	Jan. 28, 2018	Apr. 30, 2017	Apr. 29, 2018	Apr. 30, 2017	Oct. 27, 2019	Oct. 28, 2018	Oct. 29, 2017
Income Tax Disclosure [Line Items]
Effective tax rate		18.80%		22.50%	6.50%	29.30%
U.S. statutory rate	35.00%	21.00%		35.00%
Toll charge rate on accumulated earnings in cash					15.50%
Toll charge rate on accumulated earnings not in cash					8.00%
Change in tax rate, deferred tax asset, provisional income tax expense					$ (2.5)
Change in tax rate, deferred tax asset, valuation allowance					2.5
Provisional income tax expense (benefit)					0.0
Estimated deemed repatriation transition tax					28.4
Estimated deemed repatriation transition tax, valuation allowance					$ (28.4)
Income Tax Holiday [Line Items]
Term of tax year holidays					5 years
Dollar effect of income tax holiday		$ 0.7		$ 0.1	$ 0.8	$ 0.2
Per share effect of income tax holiday (in dollars per share)		$ 0.01		$ 0	$ 0.01	$ 0
Unrecognized tax benefits		$ 4.0			$ 4.0				$ 3.4
Interest and penalties accrued related to uncertain tax positions		0.1			0.1				$ 0.1
Amount of reasonably possible decrease in uncertain tax positions		$ 1.4			$ 1.4
Taiwan Agency of the Ministry of Finance [Member]
Income Tax Disclosure [Line Items]
Foreign statutory rate					20.00%				17.00%
Foreign income tax expense (benefit)			$ (0.2)
Federal Alternate Minimum [Member]
Income Tax Disclosure [Line Items]
Credit carryforwards refund period					4 years
Tax credit carryforward, amount			3.9
Valuation allowance change			$ (3.9)
Plan [Member]
Income Tax Disclosure [Line Items]
U.S. statutory rate							21.00%	23.40%
Foreign Tax Authority [Member] | Minimum [Member]
Income Tax Holiday [Line Items]
Income tax holiday termination date					October 31, 2017
Foreign Tax Authority [Member] | Maximum [Member]
Income Tax Holiday [Line Items]
Income tax holiday termination date					December 31, 2019