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Defined Benefit Pension Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Company expected contributions remainder of fiscal year	$ 60,000
Contributions made by company	$ 0	$ 0

X

- References

No definition available.

+ Details

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X

- 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 Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 1



-Subparagraph (b)(3)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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- Definition

Amount of benefits from a defined benefit plan expected to be paid in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

No definition available.

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