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Lease Commitments - Summary of Aggregate Minimum Rental Commitments under all Non-cancelable Operating Leases (Details)
$ in Millions
Apr. 30, 2016
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2017 $ 4.9
2018 2.7
2019 1.8
2020 1.0
2021 $ 0.7