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Summary of Significant Accounting Policies (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Oct. 31, 2013
Debt Instrument, Year of Maturity 2019
Canyons Obligation [Member]
 
Debt Instrument, Fair Value Disclosure $ 307,706
Debt Instrument, Year of Maturity 2063