Stock Split (Schedule Of Proforma Earnings Per Share And Weighted Average Shares Outstanding) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Stock Split [Abstract]
Proforma weighted average shares - basic	150,106	155,160	150,310	154,750
Proforma weighted average shares - diluted	152,826	157,956	152,962	157,534
Net earnings as reported	$ 53,821	$ 44,579	$ 122,374	$ 97,713
Proforma net earnings per share - basic	$ 0.36	$ 0.29	$ 0.81	$ 0.63
Proforma net earnings per share - diluted	$ 0.35	$ 0.28	$ 0.80	$ 0.62

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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