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. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	Apr. 30, 2016	May 02, 2015	May 03, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 212.8	$ 184.6	$ 208.4	$ 203.3	$ 227.3	$ 206.0	$ 229.7	$ 218.1	$ 809.1	$ 881.1	$ 772.8
Property, plant and equipment	93.0				93.3				93.0	93.3	101.2
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									491.9	564.6	456.6
Property, plant and equipment	44.0				42.7				44.0	42.7	43.8
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									124.8	112.6	97.4
Property, plant and equipment	7.4				9.0				7.4	9.0	6.6
Malta
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									167.1	153.5	186.4
Property, plant and equipment	28.7				28.0				28.7	28.0	37.5
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment	3.9				5.8				3.9	5.8	7.3
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									25.3	50.4	32.4
Property, plant and equipment	$ 9.0				$ 7.8				$ 9.0	$ 7.8	$ 6.0