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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions | Oct. 03, 2017 | Jul. 27, 2017 | Jul. 28, 2018 | Apr. 28, 2018
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Goodwill [Line Items] |  |  |  |
Goodwill |  |  | $ 58.8 | $ 59.2
Trade names not subject to amortization |  |  | $ 1.8 | $ 1.8
Procoplast |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill |  | $ 6.8 |  |
Intangible assets acquired |  | 19.2 |  |
Procoplast | Technology Licenses |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets acquired |  | $ 2.1 |  |
Amortization period |  | 8 years 6 months |  |
Procoplast | Trade Names |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets acquired |  | $ 2.0 |  |
Amortization period |  | 8 years 6 months |  |
Pacific Insight |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 50.4 |  |  |
Intangible assets acquired | 40.1 |  |  |
Pacific Insight | Technology Licenses |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets acquired | $ 1.7 |  |  |
Amortization period | 5 years 6 months |  |  |
Pacific Insight | Trade Names |  |  |  |
Goodwill [Line Items] |  |  |  |
Intangible assets acquired | $ 6.2 |  |  |
Amortization period | 7 years 6 months |  |  |

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