Segment Disclosure - Additional information (Detail)	3 Months Ended	6 Months Ended
Apr. 30, 2013 Customer Segment	Apr. 30, 2012 Customer Segment	Apr. 30, 2013 Segment Customer	Apr. 30, 2012 Segment Customer
Segment Reporting Information [Line Items]
Number of reportable operating segment	1	1	1	1
Number of major customers	1	1	1	1
Percentage of revenues contributed by major customers	11.60%	10.10%	11.40%	10.30%

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration