Employee Savings Plan - Additional Information (Detail) (USD $)	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Postemployment Benefits [Abstract]
Employees to deposit into tax deferred investment accounts	50.00%
Contribution of company in employee saving plan	$ 401,000	$ 412,000	$ 204,000

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration