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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 9 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2015
Apr. 30, 2014
Net Earnings Per Share [Abstract]        
Weighted average shares - basic 137,246,854us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 145,310,710us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 138,272,093us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 146,543,727us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common share equivalents 1,541,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 2,028,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 1,740,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 2,065,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares - diluted 138,787,914us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 147,339,425us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 140,012,046us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 148,608,748us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net earnings for basic and diluted earnings per share computation $ 46,372us-gaap_NetIncomeLoss $ 67,336us-gaap_NetIncomeLoss $ 151,849us-gaap_NetIncomeLoss $ 187,268us-gaap_NetIncomeLoss
Net earnings per share - basic $ 0.34us-gaap_EarningsPerShareBasic $ 0.46us-gaap_EarningsPerShareBasic $ 1.10us-gaap_EarningsPerShareBasic $ 1.28us-gaap_EarningsPerShareBasic
Net earnings per share - diluted $ 0.33us-gaap_EarningsPerShareDiluted $ 0.46us-gaap_EarningsPerShareDiluted $ 1.08us-gaap_EarningsPerShareDiluted $ 1.26us-gaap_EarningsPerShareDiluted