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Defined Benefit Pension Plans - Additional Information (Detail) (USD $)	9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Company expected contributions	$ 0us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsRemainderOfFiscalYear
Contributions made by company	$ 775,000us-gaap_DefinedBenefitPlanContributionsByEmployer	$ 300,000us-gaap_DefinedBenefitPlanContributionsByEmployer

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- Details

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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 Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

+ Details

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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.

+ Details

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