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Net Earnings Per Share (Schedule Of Information Necessary To Calculate Basic And Diluted Net Earnings Per Common Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jan. 31, 2015
Jan. 31, 2014
Jan. 31, 2015
Jan. 31, 2014
Net Earnings Per Share [Abstract]        
Weighted average shares - basic 137,954,594us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 146,957,131us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 138,768,007us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 147,140,135us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common share equivalents 1,706,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 2,065,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,820,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 2,064,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares - diluted 139,661,287us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 149,021,755us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 140,587,668us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 149,204,090us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net earnings for basic and diluted earnings per share computation $ 49,530us-gaap_NetIncomeLoss $ 58,340us-gaap_NetIncomeLoss $ 105,477us-gaap_NetIncomeLoss $ 119,932us-gaap_NetIncomeLoss
Net earnings per share - basic $ 0.36us-gaap_EarningsPerShareBasic $ 0.40us-gaap_EarningsPerShareBasic $ 0.76us-gaap_EarningsPerShareBasic $ 0.82us-gaap_EarningsPerShareBasic
Net earnings per share - diluted $ 0.35us-gaap_EarningsPerShareDiluted $ 0.39us-gaap_EarningsPerShareDiluted $ 0.75us-gaap_EarningsPerShareDiluted $ 0.80us-gaap_EarningsPerShareDiluted