Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Commitment And Contingencies [Line Items]
Rental expense for operating leases	$ 1,100,000	$ 1,000,000	$ 931,000.0
Employee contribution percentage	60.00%
Various Operating Leases
Commitment And Contingencies [Line Items]
Operating lease rental income	$ 236,000	309,000	270,000
Headquarters in Atlanta, GA
Commitment And Contingencies [Line Items]
Operating lease rental income	$ 538,000	$ 723,000	$ 687,000

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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