Other Expenses - Other Expenses Breakout (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Expenses [Abstract]
Accretion Expense	$ 0.0	$ 0.2
General Insurance Expense	0.5	0.4
Advertising Expense	0.9	0.7
Technology Services Costs	2.9	1.5
Supplies and Postage Expense	0.6	0.3
Clearance Fees	0.4	0.2
Taxes, Miscellaneous	1.1	1.0
Other Expenses	2.1	2.0
Other Cost and Expense, Operating	$ 8.5	$ 6.3