Allocated share based compensation expense (benefit).

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Employee service share based compensation nonvested awards total compensation cost not yet recognized vesting period.

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Employee stock purchase plan payroll deduction percent.

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Implementation of employee stock purchase plan duration period.

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Number of incentive stock plans.

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Percentage of stock outperform in order for target awards to vest.

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Share-based compensation arrangement by share-based payment award, options, except in specific circumstances, grants vest over in period.

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- Definition

Share-based compensation arrangement by share-based payment award, options, except in specific circumstances, stock options are exercisable.

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Share based compensation arrangement by share based payment awards performance period.

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- Definition

Share based compensation percentage of target award granted for calculating maximum aggregate award of performance share.

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- Definition

Aggregate number of common shares reserved for future issuance.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

Fair value of the shares allocated that are subject to a repurchase obligation.

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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Description of service or performance condition required to be met for earning right to award under share-based payment arrangement. Includes, but is not limited to, combination of market, performance or service condition.

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- Definition

Discount rate from fair value on offering date that participants pay for shares.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest quantity of shares an employee can purchase under the plan per period.

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Number of shares authorized for issuance under share-based payment arrangement.

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Description of terms of award under share-based payment arrangement.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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- Definition

Number of shares of capital stock issued (purchased by employees) in connection with an employee stock ownership plan.

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Stock-Based Compensation - Additional Information (Details)	12 Months Ended
	Apr. 30, 2021 USD ($) Plan shares	Apr. 30, 2020 USD ($) shares	Apr. 30, 2019 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of incentive stock plans \| Plan	2
Incremental stock-based compensation expense \| $	$ 711,000
Vesting period of incremental stock-based compensation expense to be recognized	1 year 3 months 18 days
Awards granted, vesting period	4 years
Performance based restricted stock unit performance period	3 years
Percentage of maximum aggregate award granted	200.00%
Percentage of stock outperform in order for target award to vest	5.00%
2020 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Implementation of employee stock purchase plan duration	12 months
Option exercise price per share as a percentage of fair market value	85.00%
Number of shares an employee may purchase under the stock purchase plan	2,500
Shares issued under employee stock purchase plan \| $	$ 25,000
Shares purchased by employees under employee stock purchase plan	34,947
Service-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards cancelled	2,994	37,417	11,462
PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards cancelled		14,400
Service-based RSUs and PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unvested awards, unrecognized compensation expense \| $	$ 2,400,000
Unvested awards, unrecognized compensation expense recognition period	1 year 8 months 12 days
Employees and Directors \| Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted, description	We grant RSUs to employees and directors. The awards are made at no cost to the recipient. An RSU represents the right to receive one share of our common stock and does not carry voting or dividend rights.
Awards granted, vesting period	4 years
Awards granted, vesting description	RSU grants to employees generally vest over a period of four years with one-fourth of the units vesting on each anniversary of the grant date.
Executive Officers, Non-Executive Officer Employees and Directors [Member] \| Service-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted	166,319
Employees \| Service-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted		81,416	64,191
Cost of Sales, Sales and Marketing, Research and Development, and General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense (benefit) \| $	$ 2,900,000	$ 850,000	$ 2,300,000
Cost of Sales, Sales and Marketing, Research and Development, and General and Administrative Expenses \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense (benefit) \| $		607,000	1,100,000
Cost of Sales, Sales and Marketing, Research and Development, and General and Administrative Expenses \| SWBI Corporate and Shared Employee
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense (benefit) \| $	$ 224,000	244,000	1,200,000
Minimum \| 2020 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Payroll deduction of participant's compensation	1.00%
Maximum \| 2020 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Authorized sale of shares of common stock	419,253
Payroll deduction of participant's compensation	20.00%
2020 Incentive Compensation Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock remain available for issuance	0
Stock options exercisable period	10 years
2020 Incentive Compensation Plan \| Service-based RSUs and PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted	244,364
Awards cancelled	2,994
2020 Incentive Compensation Plan \| Executive Officers and Employees \| PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted	78,045
2020 Incentive Compensation Plan \| Directors \| Service-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market value of awards delivered in connection with vesting of RSUs \| $	$ 891,000
2020 Incentive Compensation Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Incentive stock plans grants vest over in period	3 years
2020 Incentive Compensation Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized to be issued	1,397,510
Incentive stock plans grants vest over in period	4 years
Former Parent's 2013 Incentive Stock Plan \| Employees \| Service-based RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Market value of awards delivered in connection with vesting of RSUs \| $		$ 494,000	$ 519,000
Former Parent's 2013 Incentive Stock Plan \| Employees \| PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted		44,871	28,800