Other Financial Instruments and Fair Value Measurements (Details 3) (USD $) In Thousands	12 Months Ended
Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Nonfinancial assets adjusted to fair value
Total other intangible assets	$ 2,940,010	$ 3,026,515
Impairment charges	17,599	11,658	1,491
Significant Unobservable Inputs (Level 3) [Member] \| Nonfinancial Assets Adjusted To Fair Value in the Prior Year [Member]
Nonfinancial assets adjusted to fair value
Total other intangible assets		14,552	24,382
Impairment charges		(11,658)
Total Other Adjustments		1,828
Significant Unobservable Inputs (Level 3) [Member]
Nonfinancial assets adjusted to fair value
Total other intangible assets	13,549	30,860
Impairment charges	(17,599)
Total Other Adjustments	$ 288

Intangible Assets Other Adjustments Related to Foreign Currency Exchange and Amortization .

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- Definition

Disclosure, for assets and liabilities that are measured at fair value on a nonrecurring basis in periods after initial recognition, of the fair value measurement recorded during the period.

+ Details

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- Definition

The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 142
-Paragraph 46
-Subparagraph b

+ Details

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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

+ Details

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