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Segment Information and Geographic Area Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	May. 02, 2015	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May. 03, 2014	Feb. 01, 2014	Oct. 26, 2013	Jul. 27, 2013	May. 02, 2015	May. 03, 2014	Apr. 27, 2013
Segment Reporting Information [Line Items]
Net sales									$ 881.1	$ 772.8	$ 519.8
Transfers between segments									(881.1)	(772.8)	(519.8)
Net sales to unaffiliated customers	$ 227.3	$ 206.0	$ 229.7	$ 218.1	$ 224.8	$ 189.8	$ 190.9	$ 167.3	881.1	772.8	519.8
Income/(loss) from operations									112.2	73.6	39.2
Gain on sale of business									7.7	0.0	0.0
Interest (income)/expense, net									(0.7)	0.3	0.0
Other (income) expense, net									0.2	2.6	(1.3)
Income/(loss) before income taxes									120.8	75.9	37.9
Depreciation and amortization									23.4	25.6	18.8
Identifiable assets	605.8				575.5				605.8	575.5	434.9
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									0.0	0.0	0.0
Transfers between segments									0.0	0.0	0.0
Automotive
Segment Reporting Information [Line Items]
Depreciation and amortization									16.6		11.8
Identifiable assets	365.5								365.5		277.5
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net sales									633.0	524.6	318.8
Transfers between segments									(633.0)	(524.6)	(318.8)
Net sales to unaffiliated customers									628.4	522.4	317.9
Income/(loss) from operations									124.9	69.4	41.1
Depreciation and amortization										16.4
Identifiable assets					366.1					366.1
Automotive | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									4.6	2.2	0.9
Transfers between segments									(4.6)	(2.2)	(0.9)
Interface
Segment Reporting Information [Line Items]
Depreciation and amortization									2.8		3.0
Identifiable assets	186.4								186.4		138.0
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net sales									163.8	173.6	145.5
Transfers between segments									(163.8)	(173.6)	(145.5)
Net sales to unaffiliated customers									161.7	170.8	143.1
Income/(loss) from operations									7.0	26.8	20.7
Depreciation and amortization										2.9
Identifiable assets					155.0					155.0
Interface | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									2.1	2.8	2.4
Transfers between segments									(2.1)	(2.8)	(2.4)
Power Products
Segment Reporting Information [Line Items]
Depreciation and amortization									2.4		2.3
Identifiable assets	38.5								38.5		28.6
Power Products | Operating Segments
Segment Reporting Information [Line Items]
Net sales									86.1	72.7	52.8
Transfers between segments									(86.1)	(72.7)	(52.8)
Net sales to unaffiliated customers									85.7	72.5	52.6
Income/(loss) from operations									23.2	12.6	5.1
Depreciation and amortization										2.4
Identifiable assets					32.1					32.1
Power Products | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									0.4	0.2	0.2
Transfers between segments									(0.4)	(0.2)	(0.2)
Other
Segment Reporting Information [Line Items]
Depreciation and amortization									0.4		0.5
Identifiable assets	3.7								3.7		6.7
Other | Operating Segments
Segment Reporting Information [Line Items]
Net sales									5.5	7.2	6.3
Transfers between segments									(5.5)	(7.2)	(6.3)
Net sales to unaffiliated customers									5.2	7.0	6.2
Income/(loss) from operations									(6.4)	(7.0)	(7.8)
Depreciation and amortization										2.5
Identifiable assets					4.8					4.8
Other | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									0.3	0.2	0.1
Transfers between segments									(0.3)	(0.2)	(0.1)
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net sales									(7.3)	(5.3)	(3.6)
Transfers between segments									7.3	5.3	3.6
Net sales to unaffiliated customers									0.1	0.1	0.0
Income/(loss) from operations									(36.5)	(28.2)	(19.9)
Depreciation and amortization									1.2	1.4	1.2
Identifiable assets	$ 11.7				$ 17.5				11.7	17.5	(15.9)
Eliminations/Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(7.4)	(5.4)	(3.6)
Transfers between segments									$ 7.4	$ 5.4	$ 3.6

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