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Retained Earnings (Schedule Of Changes In Retained Earnings) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Retained Earnings [Abstract]        
Balance as of July 31, 2011     $ 829,148  
Net income 13,680 5,688 36,038 29,376
Dividends paid     (16,454)  
Balance as of January 31, 2012 $ 848,732   $ 848,732