Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Outstanding share awards earned and issued at greater than the target number of shares	150.00%
Restricted Stock | Minimum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Stock options, vesting period (in years)	1 year
Restricted Stock | Maximum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Stock options, vesting period (in years)	3 years
2007 Plan
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Aggregate number of shares that may be awarded (in shares)	600,000
Stock options, vesting period (in years)	10 years
Outstanding share awards that may be awarded (in shares)	252,000
Share-based compensation expense	$ 158	$ 346
Total unrecognized compensation cost related to performance and restricted shares	$ 603
Period of recognized compensation cost (in years)	1 year 6 months
2007 Plan | Performance shares
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Performance period (in years)	3 years
Performance shares vested in period (in shares)	5,000
Performance shares paid for payroll costs (in shares)	1,000
2007 Plan | Performance shares | Minimum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Common shares earned pursuant to award (in shares)	0
2007 Plan | Performance shares | Maximum
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Common shares earned as percentage of initial target number shares awarded	150.00%