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Commitment and Contingencies (Tables)
12 Months Ended
Apr. 30, 2017
Commitment and Contingencies [Abstract]  
Composition of Rent Expense for Operating Leases
The following schedule shows the composition of rent expense for operating leases (in thousands):
 
 
2017
2016
2015
Minimum Rental
$35,464
$37,206
$39,748
Less: Sublease Rentals
(626)
(597)
(639)
Total
$34,838
$36,609
$39,109