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Lease Commitments (Tables)
12 Months Ended
Apr. 30, 2016
Leases [Abstract]  
Summary of Aggregate Minimum Rental Commitments under all Non-cancelable Operating Leases
Our aggregate minimum rental commitments under all non-cancelable operating leases are summarized in the table below for the next succeeding five fiscal years:
 
2017
$
4.9

2018
$
2.7

2019
$
1.8

2020
$
1.0

2021
$
0.7