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Comprehensive Income (Tables) | 9 Months Ended
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Jan. 31, 2013
Components Of Accumulated Other Comprehensive Income | The components of accumulated other comprehensive income were as follows:
|  | January 31, 2013 |  |  | April 30, 2012 |
|  | (in thousands) |
Foreign currency translation adjustments |  | $ | 22,771 |  |  | $ | 22,813 |
Defined benefit pension adjustments, net of taxes |  |  | (15,658 | ) |  |  | (15,658 | )
Unrealized gains on marketable securities, net of taxes |  |  | 26 |  |  |  | 36 |
Accumulated other comprehensive income |  | $ | 7,139 |  |  | $ | 7,191 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669686-108580 + Details
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