Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Other Expenses [Abstract]
Accretion Expense	$ 0.4	$ 1.8	$ (2.0)
General Insurance Expense	2.1	1.7	1.6
Advertising Expense	5.1	2.7	3.1
Technology Services Costs	7.1	4.7	3.8
Supplies and Postage Expense	1.1	1.2	1.1
Clearance Fees	1.3	1.1	1.2
Taxes, Miscellaneous	4.3	3.7	3.9
Other Expenses	8.0	6.6	5.7
Operating Costs and Expenses	$ 29.4	$ 23.5	$ 18.4