Reconciliation of Federal Statutory Rate (Detail)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Reconciliation of Statutory Federal Tax Rate [Line Items]
Federal income tax at the statutory rate	35.00%	35.00%	(35.00%)
State income tax, net of federal benefit	3.40%	4.10%	(3.60%)
Nondeductible expenses	0.20%	1.40%	8.60%
Valuation allowance	(0.20%)	(62.90%)	318.60%
Interest and penalties	(2.00%)	0.40%	1.10%
Domestic production activities and state credits	(7.90%)	0.00%	0.00%
State tax rate change	5.40%	0.00%	0.00%
Other	0.70%	(0.70%)	2.00%
Effective tax rate	34.60%	(22.70%)	291.70%