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Variable Interest Entity - Total assets of EAM, maximum exposure to loss due to involvement with EAM and value of assets and liabilities (Details) - USD ($) $ in Thousands		Jul. 31, 2015	Apr. 30, 2015
Variable Interest Entity [Line Items]
Investment in EAM Trust		$ 58,154	$ 58,048
EAM Trust
Variable Interest Entity [Line Items]
VIE Assets		60,167	60,159
Investment in EAM Trust	[1]	$ 58,154	$ 58,048
Liabilities
Maximum Exposure to Loss		$ 58,154	$ 58,048
[1] Reported within Long Term Assets on the Consolidated Condensed Balance Sheets.

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 323



-SubTopic 10



-Section 45



-Paragraph 1



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-Name Accounting Standards Codification



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- Definition

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 3



-Subparagraph (bb)



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- Definition

The carrying amount of the consolidated Variable Interest Entity's liabilities included in the reporting entity's statement of financial position.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



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-Subparagraph (bb)



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- Definition

The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 810



-SubTopic 10



-Section 50



-Paragraph 4



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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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