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Long-Term Debt Long-Term Debt (Narrative) (Details) (USD $)
 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
May 29, 2013
Canyons [Member]
Jan. 31, 2014
Canyons [Member]
Business Acquisition, Effective Date of Acquisition         May 29, 2013  
Initial Capital Lease Term         P50Y  
Debt Instrument, Interest Rate, Effective Percentage         10.00%  
Gross interest expense $ 16,200,000 $ 8,500,000 $ 32,300,000 $ 16,900,000    
Amortization of deferred financing costs 500,000 500,000 1,000,000 1,000,000    
Interest costs incurred, capitalized 0 0 0 0    
Accretion Expense           $ 3,800,000