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Other Financial Instruments and Fair Value Measurements (Details 2) (USD $)
In Thousands
12 Months Ended12 Months Ended
Apr. 30, 2011
Apr. 30, 2010
Apr. 30, 2010
Finite-Lived Trademarks [Member]
Significant Unobservable Inputs (Level 3) [Member]
Nonfinancial Assets Adjusted To Fair Value in the Prior Year [Member]
Apr. 30, 2009
Finite-Lived Trademarks [Member]
Significant Unobservable Inputs (Level 3) [Member]
Nonfinancial Assets Adjusted To Fair Value in the Prior Year [Member]
Apr. 30, 2011
Customer Relationships [Member]
Apr. 30, 2011
Customer Relationships [Member]
Significant Unobservable Inputs (Level 3) [Member]
Apr. 30, 2010
Customer Relationships [Member]
Significant Unobservable Inputs (Level 3) [Member]
Apr. 30, 2011
Finite-Lived Trademarks [Member]
Apr. 30, 2010
Finite-Lived Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]         
Finite-lived trademarks, Carrying Amount$ 1,149,366$ 1,229,105$ 0$ 3,012 $ 5,208[1]$ 18,964[1]$ 28,501$ 25,731
Finite-lived Intangible Assets, Fair Value Adjustment  (2,525) (13,534)(13,534)[1]   
Finite-lived Intangible Assets, Other Adjustments  $ (487)  $ (222)[1]   
[1]The Company utilized Level 3 inputs to estimate the fair value of the nonfinancial assets. For additional information, see Note F: Goodwill and Other Intangible Assets.