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Segment Information and Geographic Area Information - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 28, 2018	Apr. 29, 2017	Apr. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 249.0	$ 228.0	$ 230.1	$ 201.2	$ 219.7	$ 195.6	$ 209.3	$ 191.9	$ 908.3	$ 816.5	$ 809.1
Property, plant and equipment	162.2				90.6				162.2	90.6	93.0
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									487.5	506.9	491.9
Property, plant and equipment	63.3				44.9				63.3	44.9	44.0
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									117.3	127.7	124.8
Property, plant and equipment	7.2				5.9				7.2	5.9	7.4
Malta
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									184.0	155.5	167.1
Property, plant and equipment	36.8				26.4				36.8	26.4	28.7
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									54.4	0.0	0.0
Property, plant and equipment	13.9				0.0				13.9	0.0	0.0
BELGIUM
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									26.2	0.0	0.0
Property, plant and equipment	25.0				0.0				25.0	0.0	0.0
EGYPT
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	10.7				8.4				10.7	8.4	8.2
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	4.6				4.3				4.6	4.3	3.9
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales									38.9	26.4	25.3
Property, plant and equipment	$ 0.7				$ 0.7				$ 0.7	$ 0.7	$ 0.8

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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