Financing Arrangements Letters of Credit Outstanding (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Line of Credit Facility [Line Items]
Letters of Credit Outstanding, Amount	$ 50	$ 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_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration