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Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Apr. 30, 2020
Lessee, Lease, Description [Line Items]
Right of use assets	$ 8,828		$ 9,312
Operating cash paid to settle lease liabilities	410	$ 314
Remaining lease term		10 years
Option to extend, term		5 years
Option to terminate, term		1 year
Operating lease, expense	632	$ 549
Operating lease, short term, expense	$ 222	$ 235
Weighted average remaining lease term, operating lease	7 years 8 months 15 days
Weighted average discount rate, operating lease	4.00%
Weighted average remaining lease term, finance lease	5 years 2 months 1 day
Weighted average discount rate, finance lease	10.00%
Pro Forma
Lessee, Lease, Description [Line Items]
Increase in operating lease liability

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Increase in Operating Lease Liability

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- Definition

Lessee, Option to Extend, Term

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Lessee, Option to Terminate, Term

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Lessee, Remaining Lease Term

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- Definition

Weighted average discount rate for finance lease calculated at point in time.

+ References

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Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of operating lease expense. Excludes sublease income.

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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- Definition

Amount of lessee's right to use underlying asset under operating lease.

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