Leases | Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Oct. 31, 2019	Apr. 30, 2019
Maturities of Operating Lease Liabilities [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 16,914
Lessee, Operating Lease, Liability, Payments, Due Year Two	65,146
Lessee, Operating Lease, Liability, Payments, Due Year Three	46,204
Lessee, Operating Lease, Liability, Payments, Due Year Four	36,642
Lessee, Operating Lease, Liability, Payments, Due Year Five	27,393
Lessee, Operating Lease, Liability, Payments, Due after Year Five	66,699
Lessee, Operating Lease, Liability, Payments, Due	258,998
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(32,395)
Operating Lease, Liability	$ 226,603	$ 205,800