Reportable Segment and Major Concentrations Data - Consolidated Net Sales (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Customer A [Member]
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Major customer net sales	$ 35,082	$ 32,771	$ 29,632
Major customer net sales, Percentage	(19.00%)	(19.00%)	(19.00%)
Customer B [Member]
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Major customer net sales	$ 25,457	$ 19,903	$ 18,308
Major customer net sales, Percentage	(13.00%)	(12.00%)	(11.00%)

Amount of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 42

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 39

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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