Restructuring Charges - Restructuring Accrual Activities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Mar. 31, 2014
Restructuring Cost and Reserve [Line Items]
Beginning Balance	$ 416
Cash payments	(414)
Ending Balance	2
Employee Severance and Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	399
Cash payments	(399)
Ending Balance
Facility-Related Costs [Member]
Restructuring Cost and Reserve [Line Items]
Beginning Balance	17
Cash payments	(15)
Ending Balance	$ 2

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 420

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Name:	us-gaap_RestructuringReserveCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant