Acquisitions (Summary Of Estimate Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	May 29, 2013
Business Acquisition [Line Items]
Business Acquisition, Purchase Price Allocation, Current Assets, Accounts Receivable			$ 2,187
Payments to Acquire Businesses, Net of Cash Acquired	0	19,958
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment Gross (under Capital Lease)			127,885
Business Acquisition, Purchase Price Allocation, PCMR Deposit			57,800
Business Acquisition, Purchase Price Allocation, Canyons Obligation			305,329
Business Acquisition, Purchase Price Allocation, Contingent Consideration			9,100
Business Acquisition, Purchase Price Allocation, Current Assets, Other Current Assets			1,698
Business Acquisition, Purchase Price Allocation, Property Plant and Equipment Acquired			5,475
Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liab), Net, Noncurrent			11,869
Business Acquisition, Purchase Price Allocation, Intangible Assets besides Goodwill			30,700
Business Acquisition, Purchase Price Allocation, Goodwill			106,414
Business Acquisition, Purchase Price Allocation, Total Assets Acquired			344,028
Business Acquisition, Purchase Price Allocation, Current Liabilities, Trade Payables			6,699
Business Acquisitions, Purchase Price Allocation, Current Liabilities, Deferred Revenue			1,134
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities Acquired			21,766
Business Acquisition, Purchase Price Allocation, Total Liabilities Assumed			$ 344,028