Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Commitment And Contingencies [Line Items]
Rental expense for operating leases	$ 931,000	$ 841,000	$ 854,000
Employee contribution percentage	60.00%
Headquarters in Atlanta, GA
Commitment And Contingencies [Line Items]
Operating lease rental income	$ 687,000	574,000	418,000
Various Operating Leases
Commitment And Contingencies [Line Items]
Operating lease rental income	$ 270,000	$ 230,000	$ 225,000

Commitment And Contingencies [Line Items]

No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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- Definition

The total amount of lease revenue recognized for the period for which the lessee was obligated under leasing arrangements regardless of any other events or conditions. This amount excludes contingent revenue and sublease revenue.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=7501430&loc=d3e39896-112707

+ Details

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- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717

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