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Compensation Expense Recognized on Awards (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Oct. 31, 2012	Oct. 31, 2011
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 2,644	$ 2,251
Performance Based Earnings per Share Related Condition
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	1,056	958
Performance Based Total Shareholder Return Related Condition
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	714	775
Performance Based Expense
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	1,770	1,733
Time Based Stock Options and Restricted Stock Grants
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Share-based compensation expense before tax	$ 874	$ 518

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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