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REVENUE - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 26, 2019	Jan. 27, 2018	Jan. 26, 2019	Jan. 27, 2018
Disaggregation of Revenue [Line Items]
Net Sales	$ 246.9	$ 228.0	$ 734.3	$ 659.3
Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	239.7		709.3
Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	7.2		25.0
U.S.
Disaggregation of Revenue [Line Items]
Net Sales	127.9		368.9
Malta
Disaggregation of Revenue [Line Items]
Net Sales	33.8		109.7
China
Disaggregation of Revenue [Line Items]
Net Sales	30.1		90.6
Canada
Disaggregation of Revenue [Line Items]
Net Sales	26.6		74.2
Egypt
Disaggregation of Revenue [Line Items]
Net Sales	10.0		35.6
Belgium
Disaggregation of Revenue [Line Items]
Net Sales	7.2		24.2
Other
Disaggregation of Revenue [Line Items]
Net Sales	11.3		31.1
Automotive
Disaggregation of Revenue [Line Items]
Net Sales	172.9	184.9	549.8	528.1
Automotive | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	165.7		524.8
Automotive | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	7.2		25.0
Automotive | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	80.7		254.7
Automotive | Malta
Disaggregation of Revenue [Line Items]
Net Sales	26.7		86.8
Automotive | China
Disaggregation of Revenue [Line Items]
Net Sales	20.5		63.0
Automotive | Canada
Disaggregation of Revenue [Line Items]
Net Sales	21.1		66.2
Automotive | Egypt
Disaggregation of Revenue [Line Items]
Net Sales	10.0		35.6
Automotive | Belgium
Disaggregation of Revenue [Line Items]
Net Sales	7.2		24.2
Automotive | Other
Disaggregation of Revenue [Line Items]
Net Sales	6.7		19.3
Industrial
Disaggregation of Revenue [Line Items]
Net Sales	60.2	25.5	139.8	76.0
Industrial | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	60.2		139.8
Industrial | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Industrial | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	33.8		70.8
Industrial | Malta
Disaggregation of Revenue [Line Items]
Net Sales	7.0		22.7
Industrial | China
Disaggregation of Revenue [Line Items]
Net Sales	9.6		27.5
Industrial | Canada
Disaggregation of Revenue [Line Items]
Net Sales	5.5		8.0
Industrial | Egypt
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Industrial | Belgium
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Industrial | Other
Disaggregation of Revenue [Line Items]
Net Sales	4.3		10.8
Medical
Disaggregation of Revenue [Line Items]
Net Sales	0.1	0.1	0.7	0.2
Medical | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	0.1		0.7
Medical | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Medical | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	0.1		0.7
Medical | Malta
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Medical | China
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Medical | Canada
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Medical | Egypt
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Medical | Belgium
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Medical | Other
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Interface
Disaggregation of Revenue [Line Items]
Net Sales	13.7	$ 17.6	44.0	$ 55.1
Interface | Goods Transferred at a Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	13.7		44.0
Interface | Goods Transferred Over Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Interface | U.S.
Disaggregation of Revenue [Line Items]
Net Sales	13.3		42.7
Interface | Malta
Disaggregation of Revenue [Line Items]
Net Sales	0.1		0.2
Interface | China
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.1
Interface | Canada
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Interface | Egypt
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Interface | Belgium
Disaggregation of Revenue [Line Items]
Net Sales	0.0		0.0
Interface | Other
Disaggregation of Revenue [Line Items]
Net Sales	$ 0.3		$ 1.0

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