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Share-Based Payments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Share-Based Payments
Share-based compensation expense included in selling, distribution, and administrative expenses	$ 6,009	$ 5,593	$ 10,125	$ 10,744
Share-based compensation expense included in other restructuring and merger and integration costs	187	951	386	1,875
Total share-based compensation expense	6,196	6,544	10,511	12,619
Related income tax benefit	$ 2,083	$ 2,236	$ 3,538	$ 4,250

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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