GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Millions	Oct. 03, 2017	Jul. 27, 2017	Jul. 28, 2018	Apr. 28, 2018
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