Credit Facilities - Subordinated Loans (Details) - USD ($) $ in Millions	Jan. 31, 2018	Oct. 31, 2015
Subordinated loan maturing October 2025
Long-Term Obligations
Aggregate principal amount		$ 2.0
Interest rate (as a percent)		6.71%
Subordinated loan maturing April 2028
Long-Term Obligations
Aggregate principal amount	$ 4.5
Interest rate (as a percent)	6.875%

Face (par) amount of debt instrument at time of issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant