Long-Term Debt Long-Term Debt (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2014	Apr. 30, 2013	May 29, 2013 Canyons [Member]	Apr. 30, 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	$ 16,400,000	$ 8,400,000	$ 48,700,000	$ 25,300,000
Amortization of deferred financing costs	500,000	500,000	1,500,000	1,500,000
Interest costs incurred, capitalized	0	0	0	0
Accretion Expense						$ 5,100,000