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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
	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
Segment Reporting Information [Line Items]
Net sales									$ 809.1	$ 881.1	$ 772.8
Transfers between segments									(809.1)	(881.1)	(772.8)
Net sales to unaffiliated customers	$ 212.8	$ 184.6	$ 208.4	$ 203.3	$ 227.3	$ 206.0	$ 229.7	$ 218.1	809.1	881.1	772.8
Income/(loss) from operations									109.7	112.2	73.6
Gain from sale of business									0.0	(7.7)	0.0
Interest (income)/expense, net									(0.7)	(0.7)	0.3
Other (income) expense, net									0.5	0.2	2.6
Income/(loss) before income taxes									110.9	120.8	75.9
Depreciation and amortization									23.9	23.4	25.6
Identifiable assets	655.9				605.8				655.9	605.8	575.5
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									15.6		16.4
Identifiable assets	418.4								418.4		366.1
Automotive | Operating Segments
Segment Reporting Information [Line Items]
Net sales									623.1	633.0	524.6
Transfers between segments									(623.1)	(633.0)	(524.6)
Net sales to unaffiliated customers									614.3	628.4	522.4
Income/(loss) from operations									136.8	124.9	69.4
Depreciation and amortization										16.6
Identifiable assets					365.5					365.5
Automotive | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									8.8	4.6	2.2
Transfers between segments									(8.8)	(4.6)	(2.2)
Interface
Segment Reporting Information [Line Items]
Depreciation and amortization									4.3		2.9
Identifiable assets	184.8								184.8		155.0
Interface | Operating Segments
Segment Reporting Information [Line Items]
Net sales									142.6	163.8	173.6
Transfers between segments									(142.6)	(163.8)	(173.6)
Net sales to unaffiliated customers									140.8	161.7	170.8
Income/(loss) from operations									2.7	7.0	26.8
Depreciation and amortization										2.8
Identifiable assets					186.4					186.4
Interface | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									1.8	2.1	2.8
Transfers between segments									(1.8)	(2.1)	(2.8)
Power Products
Segment Reporting Information [Line Items]
Depreciation and amortization									2.3		2.4
Identifiable assets	46.4								46.4		32.1
Power Products | Operating Segments
Segment Reporting Information [Line Items]
Net sales									54.1	86.1	72.7
Transfers between segments									(54.1)	(86.1)	(72.7)
Net sales to unaffiliated customers									53.5	85.7	72.5
Income/(loss) from operations									9.4	23.2	12.6
Depreciation and amortization										2.4
Identifiable assets					38.5					38.5
Power Products | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									0.6	0.4	0.2
Transfers between segments									(0.6)	(0.4)	(0.2)
Other
Segment Reporting Information [Line Items]
Depreciation and amortization									0.6		2.5
Identifiable assets	5.0								5.0		4.8
Other | Operating Segments
Segment Reporting Information [Line Items]
Net sales									0.6	5.5	7.2
Transfers between segments									(0.6)	(5.5)	(7.2)
Net sales to unaffiliated customers									0.3	5.2	7.0
Income/(loss) from operations									(8.8)	(6.4)	(7.0)
Depreciation and amortization										0.4
Identifiable assets					3.7					3.7
Other | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									0.3	0.3	0.2
Transfers between segments									(0.3)	(0.3)	(0.2)
Eliminations/Corporate
Segment Reporting Information [Line Items]
Net sales									(11.3)	(7.3)	(5.3)
Transfers between segments									11.3	7.3	5.3
Net sales to unaffiliated customers									0.2	0.1	0.1
Income/(loss) from operations									(30.4)	(36.5)	(28.2)
Depreciation and amortization									1.1	1.2	1.4
Identifiable assets	$ 1.3				$ 11.7				1.3	11.7	17.5
Eliminations/Corporate | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(11.5)	(7.4)	(5.4)
Transfers between segments									$ 11.5	$ 7.4	$ 5.4

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