Leases | Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	Jul. 31, 2019	Apr. 30, 2019
Maturities of Operating Lease Liabilities [Abstract]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 33,408
Lessee, Operating Lease, Liability, Payments, Due Year Two	63,070
Lessee, Operating Lease, Liability, Payments, Due Year Three	41,811
Lessee, Operating Lease, Liability, Payments, Due Year Four	30,247
Lessee, Operating Lease, Liability, Payments, Due Year Five	22,390
Lessee, Operating Lease, Liability, Payments, Due after Year Five	35,788
Lessee, Operating Lease, Liability, Payments, Due	226,714
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(25,834)
Operating Lease, Liability	$ 200,880	$ 205,800