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Pre-Production Costs Related to Long-Term Supply Arrangements - Narrative (Details) - USD ($)
$ in Millions
Apr. 27, 2019
Apr. 28, 2018
Preproduction Costs Related to Long-term Supply Arrangements [Abstract]    
Pre-production tooling costs $ 32.8 $ 20.5
Company owned pre-production tooling capitalized within property, plant and equipment $ 15.0 $ 10.1