Segment Disclosure - Additional information (Detail)	3 Months Ended
Jan. 31, 2013 Customer Segment	Jan. 31, 2012 Segment Customer
Segment Reporting Information [Line Items]
Number of reportable operating segment	1	1
Number of major customers	1	1
Percentage of revenues contributed by major customers	11.00%	10.60%

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