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Fair Values (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Fair Values (Narrative) (Details) (USD $)	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014	Jul. 31, 2014
Debt Instrument [Line Items]
Aggregate carrying amount of equity method investments	$ 18,300,000us-gaap_EquityMethodInvestments		$ 18,300,000us-gaap_EquityMethodInvestments		$ 21,400,000us-gaap_EquityMethodInvestments
Impairment charges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Long-Term Debt [Member]
Debt Instrument [Line Items]
Fair value of debt	265,900,000		265,900,000
Debt carrying amount	$ 250,000,000		$ 250,000,000