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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 |  |  |  |

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