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PRE-PRODUCTION COSTS RELATED TO LONG-TERM SUPPLY ARRANGEMENTS - Narrative (Details) - USD ($)
$ in Millions
Jan. 28, 2017
Apr. 30, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Pre-production tooling costs $ 17.0 $ 9.5
Company owned pre-production tooling capitalized within property, plant and equipment $ 6.0 $ 8.0