Income Taxes - Textual (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Taxes [Abstract]
Effective tax rate	34.50%	33.20%	34.50%
Federal statutory rate	35.00%
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 40.1	$ 58.5
Unrecognized tax benefits	0.0	0.0	$ 0.0
Accrued interest related to unrecognized tax benefits	0.0	0.0	0.0
Accrued penalties related to unrecognized tax benefits	0.0	$ 0.0	0.0
Interest benefits related to unrecognized tax benefits			$ (2.2)
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	40.1
State [Member] | Tax Credit Carryforward Amount to Expire [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carry forwards	1.6
State [Member] | Tax Credit Carryforward Amount with No Expiration [Member]
Operating Loss Carryforwards [Line Items]
Tax credit carry forwards	1.3
State [Member] | NOL Carryforwards to Expire in One to Five Years [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration	0.3
State [Member] | NOL Carryforwards to Expire in Six to Ten Years [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration	12.9
State [Member] | Latest Tax Year [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards, subject to expiration	$ 26.9