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Commitments and Contingencies Commitments (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Apr. 30, 2014
Commitments (Textual) [Abstract]      
Rental payment under operating leases $ 23 $ 23 $ 24
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
Minimum lease payment, 2017 18    
Minimum lease payment, 2018 10    
Minimum lease payment, 2019 8    
Minimum lease payment, 2020 5    
Minimum lease payment, 2021 2    
Minimum lease payment, after 2021 3    
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract]      
Total purchase obligation, 2017 10    
Total purchase obligation, 2018 4    
Total purchase obligation, 2019 3    
Total purchase obligation, 2020 1    
Total purchase obligation, 2021 1    
Total purchase obligation, after 2021 $ 1    
Agave [Member]      
Commitments (Textual) [Abstract]      
Agave purchase contract, period (years) 10 years    
Total obligations $ 2