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Summary of Quarterly Results of Operations (Unaudited) - Narrative - Significant Items for Fiscal 2015 (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Feb. 03, 2015	Apr. 30, 2016	Apr. 30, 2016	May 02, 2015
Segment Reporting Information [Line Items]
Goodwill impairment charge			$ 0.0	$ 11.1
Malta \| Foreign tax authority
Segment Reporting Information [Line Items]
Valuation allowance, deferred tax asset		$ 5.0
Trace Laboratories
Segment Reporting Information [Line Items]
Pre-tax gain on sale	$ 7.7	7.7
Interface
Segment Reporting Information [Line Items]
Goodwill impairment charge			$ 0.0	11.1
TouchSensor \| Interface
Segment Reporting Information [Line Items]
Goodwill impairment charge		$ 11.1		$ 11.1