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Share-Based Payments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Share-Based Payments
Share-based compensation expense included in selling, distribution, and administrative expenses	$ 5,131	$ 3,576	$ 15,256	$ 14,320
Share-based compensation expense included in other restructuring and merger and integration costs	185	415	571	2,290
Total share-based compensation expense	5,316	3,991	15,827	16,610
Related income tax benefit	$ 1,816	$ 1,366	$ 5,354	$ 5,616

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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