Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2007	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Net operating loss carryforwards recognized	$ 8.0
Net operating loss carryforwards amount		$ 73.8
Tax refund on amended returns		6.2
Reduction in federal tax liability		19.6
Unrecognized tax benefits, income tax penalties and interest accrued		0.5	$ 1.9
Income tax examination, penalties and interest expense		(1.4)	$ (0.1)	$ 0.0
Unrecognized Tax Benefits, Period Increase (Decrease)		(27.7)
Tax Adjustments, Settlements, and Unusual Provisions		23.8
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		1.0
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		0.7
State and Local Jurisdiction [Member]
State operating loss carryforwards		34.3
Operating loss carryforwards, valuation allowance		$ 29.4