Stock-Based Benefit Plans (Details Textual) - USD ($) $ in Millions	Apr. 30, 2017	Oct. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Unamortized value of outstanding stock-based compensation awards	$ 37.2	$ 27.0

Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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