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Fair Values (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
Fair Values (Narrative) (Details) (USD $)	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014	Jul. 31, 2014
Debt Instrument [Line Items]
Aggregate carrying amount of equity method investments	$ 20,100,000us-gaap_EquityMethodInvestments		$ 20,100,000us-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	245,200,000		245,200,000
Debt carrying amount	$ 225,000,000		$ 225,000,000