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Description of Business and Summary of Significant Accounting Policies - Inventory (Details) - USD ($)
$ in Millions
Apr. 27, 2019
Apr. 28, 2018
Inventory Disclosure [Abstract]    
Finished Products $ 40.2 $ 15.4
Work in Process 9.4 14.6
Materials 67.1 54.1
Total Inventories $ 116.7 $ 84.1