Commitments and Contingencies - Additional Information (Details) - USD ($)	12 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Commitment And Contingencies [Line Items]
Rental expense for operating leases	$ 1,300,000	$ 1,100,000	$ 1,000,000
Employee contribution percentage	60.00%
Employer profit sharing contribution to 401(k)plan	$ 429,000	330,000	0
Various Operating Leases
Commitment And Contingencies [Line Items]
Operating lease rental income	0	0	236,000
Headquarters in Atlanta, GA
Commitment And Contingencies [Line Items]
Operating lease rental income	$ 350,000	$ 357,000	$ 538,000

Commitment And Contingencies [Line Items]

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

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.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902458&loc=d3e39896-112707

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717

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