Income Taxes - Principal Reasons for Differences from Federal Statutory Rate (Detail)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Federal tax at statutory rate	34.00%	34.00%
True-up of prior year's tax provision	1.40%	0.00%
State tax at statutory rate	5.50%	5.80%
Permanent and other differences	0.40%	0.50%
Disallowed capital loss	0.00%	0.60%
Effective Tax Rate	41.30%	40.90%