New Accounting Pronouncements Lessee Operating leases (Policies)	6 Months Ended
	Oct. 31, 2020
Accounting Policies [Abstract]
Leases	Operating Leases - ROU assets related to operating leases are presented as “Operating lease right-of-use assets” on the unaudited condensed consolidated balance sheets. Lease liabilities related to operating leases with lease terms greater than twelve months are presented in “Short-term lease liability - operating” and “Long-term lease liability - operating” on the unaudited condensed consolidated balance sheets.Operating lease ROU assets and lease liabilities are recognized at the commencement date based on the present value of the future lease payments over the lease term. The discount rate used to determine the present value of the lease payments is the rate implicit in the lease unless that rate cannot be readily determined, in which case, the Company utilizes its incremental borrowing rate in determining the present value of the future lease payments. The incremental borrowing rate is the rate of interest that the Company would have to pay to borrow on a collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment. Operating lease ROU assets may also include any cumulative prepaid or accrued rent when the lease payments are uneven throughout the lease term. The ROU assets and lease liabilities may also include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The ROU asset includes any lease payments made and lease incentives received prior to the commencement date. The Company has lease arrangements with lease and non-lease components which are accounted for separately. Non-lease components of the lease payments are expensed as incurred and are not included in determining the present value.