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Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
3 Months Ended
Jul. 28, 2017
Jul. 29, 2016
Goodwill and Intangible Assets Disclosure [Abstract]    
Goodwill impairment $ 0 $ 0
Impairment of definite-lived intangible assets 0 0
Impairment of indefinite-lived intangible assets 0 0
Amortization expense $ 454,000,000 $ 487,000,000