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Basis of Presentation (Policies)
 9 Months Ended
Jan. 31, 2014
Accounting Policies [Abstract]  
New Accounting Policies Adopted and Pending Adoption

New Accounting Pronouncements Pending Adoption

Income Taxes

In July 2013, the Financial Accounting Standards Board (“FASB”) issued an accounting standards update for the reporting of an unrecognized tax benefit, or portion thereof, as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. The update provides an exception, requiring the unrecognized tax benefit to be presented in the financial statements as a liability when the carryforward is not available at the reporting date under the tax laws to settle additional income taxes that would result for the disallowance of a tax provision or the tax laws do not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose. This guidance is effective prospectively, with retrospective application permitted, for annual periods, and interim reporting periods within those years, beginning after December 15, 2013, with early adoption permitted. We do not expect a material impact on our consolidated financial statements as a result of adopting this standard.

Adoption of New Accounting Pronouncements

Comprehensive Income

In February 2013, the FASB issued an accounting standards update for the reporting of reclassifications out of accumulated other comprehensive income (loss). This guidance requires an entity to report the effect of significant reclassifications out of accumulated other comprehensive income (loss) on the respective line items in net income (loss) or in the notes to consolidated financial statements if the amount being reclassified is required under GAAP to be reclassified in its entirety to net income (loss). For other amounts not required under GAAP to be reclassified in their entirety to net income (loss) in the same reporting period, an entity is required to cross-reference other disclosures required under GAAP that provide additional detail about those amounts. This guidance is effective prospectively for annual and interim reporting periods within those years, beginning after December 15, 2012. We adopted this guidance effective May 1, 2013 and it has not had, and we believe it will not have, a material impact on our consolidated financial statements. See Note 7 for presentation of the information required by this accounting standards update.

Indefinite-Lived Intangible Assets Impairment Test

In July 2012, the FASB issued an accounting standards update on indefinite-lived intangible assets impairment testing. This guidance permits an entity to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the quantitative impairment test. If after assessing the totality of events or circumstances, an entity determines that it is not more likely than not that the indefinite-lived intangible assets are impaired, then the entity will not need to perform the quantitative impairment test in accordance with FASB Accounting Standards Codification (“ASC”) 350-30. This guidance is effective for annual and interim indefinite-lived assets impairment tests performed for annual reporting periods beginning after September 15, 2012, with early adoption permitted. We adopted this guidance effective May 1, 2013 and it has not had, and we believe it will not have, a material impact on our consolidated financial statements.
Consolidation

Our joint venture partner in CARES is Altela, Inc. In accordance with ASC 810-10-15, we consolidate the assets, liabilities, noncontrolling interest and results of operations of CARES into our consolidated financial statements due to our controlling financial interest in the joint venture.