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Compensation Expense Recognized on Awards (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 3,310	$ 3,150	$ 5,954	$ 5,401
Performance Based Earnings per Share Related Condition Compensation Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	1,447	1,710	2,503	2,668
Performance Based Total Shareholder Return Related Condition Compensation Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	893	802	1,607	1,577
Performance Based Stock Compensation Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	2,340	2,512	4,110	4,245
Time Based Stock Options and Restricted Stock Awards
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 970	$ 638	$ 1,844	$ 1,156

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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