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Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Apr. 29, 2017
Allowances for Credit Losses    
Notes receivable, gross $ 0.0 $ 0.0
Allowance for notes receivable    
Allowances for Credit Losses    
Allowance for credit losses $ 0.0 $ 0.0