Summary of Significant Accounting Policies - Additional Information (Detail) (Interest Rate Swap [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Sep. 30, 2013
Interest Rate Swap [Member]
Accounting Policies [Line Items]
Interest rate swap agreement amount	$ 4,500	$ 6,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant