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Accounting Policies (Textual) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Accounting Policies (Textual) [Abstract]    
Inventories valued using LIFO method (percent) 54.00%  
FIFO method value of inventory in excess of reported $ 272 $ 248
Minimum [Member]    
Accounting Policies (Textual) [Abstract]    
Whiskey aging period (years) 3 years  
Minimum [Member] | Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 20 years  
Minimum [Member] | Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 3 years  
Minimum [Member] | Software [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 3 years  
Maximum [Member]    
Accounting Policies (Textual) [Abstract]    
Whiskey aging period (years) 6 years  
Maximum [Member] | Building Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 40 years  
Maximum [Member] | Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 10 years  
Maximum [Member] | Software [Member]    
Property, Plant and Equipment [Line Items]    
Estimated useful life (years) 7 years