Accounting Policies\Share-Based Payments (Details) (USD $) In Thousands	3 Months Ended	12 Months Ended
Jul. 31, 2011	Jul. 31, 2010	Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Share-Based Payments
Share-based compensation expense included in selling, distribution, and administrative expenses	$ 5,151	$ 4,340	$ 19,896	$ 20,687	$ 14,043
Share-based compensation expense included in merger and integration costs			4,148	5,262	8,062
Share-based compensation expense included in other merger and integration costs	881	988
Share-based compensation expense included in other restructuring costs	43	64	290	0	0
Total share-based compensation expense	6,075	5,392	24,334	25,949	22,105
Related income tax benefit	$ 2,014	$ 1,688	$ 8,064	$ 8,402	$ 7,261

Compensation expense included in selling, distribution, and administrative expenses.

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- Definition

Represents the portion of total expense recognized during the period arising from share-based compensation arrangements classified as merger and integration costs.

+ Details

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- Definition

Share-based compensation expense included in other merger and integration costs.

+ Details

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- Definition

Represents the portion of total expense recognized during the period arising from share-based compensation arrangements classified as restructuring costs.

+ Details

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- Definition

Share-based payments.

+ Details

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- Definition

The total recognized tax benefit related to compensation cost for share-based payment arrangements recognized in income during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph g(1)

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

+ Details

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