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Compensation Expense Recognized on Awards (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 13,396	$ 9,638	$ 5,791
Performance Based Earnings per Share Related Condition Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	7,204	3,573	896
Performance Based Total Shareholder Return Related Condition Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	3,648	2,978	976
Performance Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	10,852	6,551	1,872
Time Based Stock Options and Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 2,544	$ 3,087	$ 3,919

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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