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Intangible Assets and Goodwill - Schedule of Goodwill Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	May. 02, 2015	May. 03, 2014	Apr. 27, 2013
Goodwill [Roll Forward]
Beginning balance	$ 13.0	$ 12.9	$ 16.4
Impairment	(11.1)	0.0	(4.3)
Acquisitions		0.0	0.8
Foreign currency translation	(0.2)	0.1	0.0
Ending balance	1.7	13.0	12.9
Interface
Goodwill [Roll Forward]
Beginning balance	12.0	11.9	11.1
Impairment	(11.1)	0.0	0.0
Acquisitions		0.0	0.8
Foreign currency translation	(0.2)	0.1	0.0
Ending balance	0.7	12.0	11.9
Power Products
Goodwill [Roll Forward]
Beginning balance	1.0	1.0	5.3
Impairment	0.0	0.0	(4.3)
Acquisitions		0.0	0.0
Foreign currency translation	0.0	0.0	0.0
Ending balance	$ 1.0	$ 1.0	$ 1.0

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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