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Comprehensive Income (Tables) | 12 Months Ended
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Apr. 30, 2012
Components Of Accumulated Other Comprehensive Income | The components of accumulated other comprehensive income were as follows:
|  | April 30, |
|  | 2012 |  |  | 2011 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | 22,813 |  |  | $ | 35,639 |
Defined benefit pension adjustments, net of taxes |  |  | (15,658 | ) |  |  | (10,014 | )
Unrealized gains on marketable securities, net of taxes |  |  | 36 |  |  |  | 35 |
Accumulated other comprehensive income, net |  | $ | 7,191 |  |  | $ | 25,660 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
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