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Other Expenses - Other Expenses Breakout (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Other Expenses [Abstract]        
Accretion Expense $ 0.0 $ 0.0 $ 0.1 $ 0.3
General Insurance Expense 0.7 0.4 2.0 1.1
Advertising Expense 1.0 1.2 3.1 4.2
Technology Services Costs 3.2 1.8 8.9 4.6
Supplies and Postage Expense 0.6 0.3 1.7 0.9
Clearance Fees 0.9 0.5 1.6 1.0
Taxes, Miscellaneous 1.2 1.1 3.5 3.2
Other Expenses 2.3 1.8 6.9 5.5
Other Cost and Expense, Operating $ 9.9 $ 7.1 $ 27.8 $ 20.8