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Other Financial Instruments and Fair Value Measurements (Details 2) (USD $)
In Thousands
12 Months Ended 12 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.