Goodwill and Other Intangible Assets (Details 1) (USD $) In Thousands	Apr. 30, 2011	Apr. 30, 2010
Finite-lived intangible assets subject to amortization:
Finite-lived intangible assets subject to amortization, acquisition cost	$ 1,350,123	$ 1,344,192
Finite-lived intangible assets subject to amortization, accumulated amortization/ impairment charges	200,757	115,087
Finite-lived intangible assets subject to amortization, net	1,149,366	1,229,105
Indefinite-lived intangible assets not subject to amortization:
Total other intangible assets acquisition cost	3,149,985	3,149,985
Total other intangible assets accumulated amortization/impairment charges	209,975	123,470
Other intangible assets, net	2,940,010	3,026,515
Customer and Contractual Relationships [Member]
Finite-lived intangible assets subject to amortization:
Finite-lived intangible assets subject to amortization, acquisition cost	1,180,000	1,180,000
Finite-lived intangible assets subject to amortization, accumulated amortization/ impairment charges	168,125	95,722
Finite-lived intangible assets subject to amortization, net	1,011,875	1,084,278
Patented Technology [Member]
Finite-lived intangible assets subject to amortization:
Finite-lived intangible assets subject to amortization, acquisition cost	134,970	134,970
Finite-lived intangible assets subject to amortization, accumulated amortization/ impairment charges	25,980	15,874
Finite-lived intangible assets subject to amortization, net	108,990	119,096
Finite-Lived Trademarks [Member]
Finite-lived intangible assets subject to amortization:
Finite-lived intangible assets subject to amortization, acquisition cost	35,153	29,222
Finite-lived intangible assets subject to amortization, accumulated amortization/ impairment charges	6,652	3,491
Finite-lived intangible assets subject to amortization, net	28,501	25,731
Indefinite-Lived Trademark [Member]
Indefinite-lived intangible assets not subject to amortization:
Indefinite-lived intangible assets not subject to amortization, acquisition cost	1,799,862	1,805,793
Indefinite-lived intangible assets not subject to amortization, accumulated amortization/ impairment charges	9,218	8,383
Indefinite-lived intangible assets not subject to amortization, net	$ 1,790,644	$ 1,797,410

Acquisition cost excluding accumulated amortization and impairment charges.

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Indefinite-lived intangible assets not subject to amortization accumulated impairment.

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Intangible assets accumulated amortization and impairment.

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- Definition

Intangible assets acquisition cost.

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- Definition

The amount of acquisition cost of a business combination allocated to an identifiable intangible asset that will not be amortized. Does not include goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-Subparagraph e

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 52
-Subparagraph b

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- Definition

The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

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The aggregate sum of gross carrying value of a major finite-lived intangible asset class, less accumulated amortization and any impairment charges. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph a(1)

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Sum of the carrying amounts (original costs for current and prior period additions adjusted for impairment, if any) as of the balance sheet date of intangible assets, excluding goodwill, having a projected indefinite period of benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 45
-Subparagraph b

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 42, 45

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