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Compensation Expense Recognized on Awards (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 2,004	$ 2,315	$ 7,957	$ 7,716
Performance Based Earnings per Share Related Condition Compensation Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	9	557	2,504	3,225
Performance Based Total Shareholder Return Related Condition Compensation Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	815	1,067	2,422	2,644
Performance Based Stock Compensation Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	824	1,624	4,926	5,869
Time Based Stock Options and Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 1,180	$ 691	$ 3,031	$ 1,847

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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