Income Taxes (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2007	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
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
Current Fiscal Year End Date		--07-31
Unrecognized tax benefits, income tax penalties and interest accrued		$ 1.6	0.5
Income tax examination, penalties and interest expense		1.1	(1.4)	$ 0.1
Unrecognized Tax Benefits, Period Increase (Decrease)			(27.7)
Tax Adjustments, Settlements, and Unusual Provisions			$ 23.8
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		0.9
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		0.9
State and Local Jurisdiction [Member]
State operating loss carryforwards		34.1
Operating loss carryforwards, valuation allowance		$ 29.2