Leases - Future Minimum Lease Payments Under ASC Topic 840 (Details)	Apr. 30, 2020
Minimum
Lessee, Lease, Description [Line Items]
Capital leases, interest (as a percent)	2.00%
Maximum
Lessee, Lease, Description [Line Items]
Capital leases, interest (as a percent)	6.50%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_LesseeLeaseDescriptionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration