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Acquisitions (Summary Of Estimate Of Fair Value Of Identifiable Assets Acquired And Liabilities Assumed) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Oct. 31, 2014
PCMR [Member]
Sep. 11, 2014
PCMR [Member]
Business Acquisition [Line Items]        
Business Acquisition, Purchase Price Allocation, Current Assets, Accounts Receivable       $ 1,343
Payments to Acquire Businesses, Net of Cash Acquired 182,500 0    
Business Acquisition, Purchase Price Allocation, Current Assets, Other Current Assets       3,259
Business Acquisition, Purchase Price Allocation, Property Plant and Equipment Acquired       76,563
Business Acquisition, Purchase Price Allocation, Deferred Taxes Asset (Liab), Net, Noncurrent       7,444
Business Acquisition, Purchase Price Allocation, Real estate held for sale and investment       20,000
Business Acquisition, Purchase Price Allocation, Intangible Assets besides Goodwill       27,800
Business Acquisition, Purchase Price Allocation, Goodwill       78,857
Business Acquisition, Purchase Price Allocation, Total Assets Acquired       215,266
Business Acquisition, Purchase Price Allocation, Current Liabilities, Trade Payables       1,955
Business Acquisitions, Purchase Price Allocation, Current Liabilities, Deferred Revenue       4,361
Business Acquisition, Purchase Price Allocation, Total Liabilities Assumed       6,316
Business Combination, Consideration Transferred     $ 208,950