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Other Financial Instruments and Fair Value Measurements (Details 1) (Indefinite-Lived Trademark [Member], Significant Unobservable Inputs (Level 3) [Member], USD $)
In Thousands
12 Months Ended12 Months Ended
Apr. 30, 2010
Nonfinancial Assets Adjusted To Fair Value in the Prior Year [Member]
Apr. 30, 2009
Nonfinancial Assets Adjusted To Fair Value in the Prior Year [Member]
Apr. 30, 2011
Apr. 30, 2010
Indefinite-lived Intangible Assets by Major Class [Line Items]    
Indefinite-Lived Trademarks$ 14,552$ 21,370$ 8,341[1]$ 11,896[1]
Indefinite-lived trademark, Fair Value Adjustment(9,133) (4,065)[1] 
Indefinite-lived trademark, Other Adjustments$ 2,315 $ 510[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.