Summary of Significant Accounting Policies - Intangible Assets (Details) - Trade Names $ in Millions	Oct. 31, 2015 USD ($)
Estimate of Fair Value Measurement
Finite-Lived Intangible Assets [Line Items]
Intangible assets, value	$ 7.7
Reported Value Measurement
Finite-Lived Intangible Assets [Line Items]
Intangible assets, value	$ 6.9

Fair value portion of assets, excluding financial assets, that lack physical substance, having a limited useful life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258

Name:	us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant