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Summary of Quarterly Results of Operations (Unaudited) - Narrative - Significant Items for Fiscal 2015 (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Segment Reporting Information [Line Items]      
Goodwill impairment charge $ 0.0 $ 0.0 $ 0.0
Pre-tax gain on sale 1.6 0.0 0.0
Interface      
Segment Reporting Information [Line Items]      
Goodwill impairment charge $ 0.0 $ 0.0 $ 0.0