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Defined Benefit Pension Plans (Details Textual) (USD $)	9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Defined Benefit Pension Plans (Textual) [Abstract]
Contributions made by company	$ 1,000,000	$ 402,000
Company expected contributions	$ 0

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- Definition

The increase in the fair value of plan assets from contributions made by the employer.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

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- Definition

Amount of benefits expected to be paid in the remainder of the fiscal year following the latest fiscal year ended from a defined benefit plan.

+ References

No definition available.

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