Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Deferred Tax Assets, Valuation Allowance	$ 3.6		$ 3.6		$ 3.6
Income (Loss) from Continuing Operations before Income Taxes, Domestic					$ (9.7)	$ 16.5	$ (18.4)
Deferred Tax Liabilities, Gross	4.5		4.5
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	1.3		1.3
Income Tax Expense (Benefit)	$ 2.3	$ 6.8	$ 7.7	$ 15.6
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	15.00%	32.00%	20.00%	29.00%