Recently Issued Accounting Standards - Additional Information (Detail) - New Accounting Guidance Adopted [Member] - USD ($)	3 Months Ended
Jan. 31, 2018	Jan. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Excess tax benefit from share based compensation , operating activities	$ 4,748
Excess tax benefit from share-based compensation, reclassification from financing activities to operating activities		$ 3,144

Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907

Name:	us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration