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Recent Accounting Pronouncements
 9 Months Ended
Jan. 31, 2012
Recent Accounting Pronouncements [Abstract]  
Recent Accounting Pronouncements

9.   Recent Accounting Pronouncements

      Effective May 1, 2012, we will adopt new guidance that is intended to simplify goodwill impairment testing by adding a qualitative review step to assess whether the required quantitative impairment analysis that exists today is necessary. The fair value calculation for goodwill will not be required unless we conclude, based on the qualitative assessment, that it is more likely than not that the fair value of a reporting unit is less than its book value. If such a decline in fair value is deemed more likely than not to have occurred, then the quantitative goodwill impairment test that exists under current GAAP must be completed; otherwise, goodwill is deemed to be not impaired and no further testing is required until the next annul test date (or sooner if conditions or events before that date raise concerns of potential impairment in the business). The amended goodwill impairment guidance does not affect the manner in which a company estimates fair value. It is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011, but early adoption is permitted. We do not expect it to have a material impact on our consolidated financial statements.