Leases | Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Jan. 31, 2020	Apr. 30, 2019
Maturities of Operating Lease Liabilities [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 70,322
Lessee, Operating Lease, Liability, Payments, Due Year Two	51,843
Lessee, Operating Lease, Liability, Payments, Due Year Three	42,382
Lessee, Operating Lease, Liability, Payments, Due Year Four	32,723
Lessee, Operating Lease, Liability, Payments, Due Year Five	21,660
Lessee, Operating Lease, Liability, Payments, Due after Year Five	56,651
Lessee, Operating Lease, Liability, Payments, Due	275,581
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(34,168)
Operating Lease, Liability	$ 241,413	$ 205,800