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Self-Insurance Reserves - Additional Information (Detail) - USD ($)	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs	$ 9,469,000	$ 9,011,000	$ 8,423,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, Non-current portion	5,000,000.0	4,500,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, included in accrued expenses	4,500,000	4,500,000
Workers' compensation receivable classified as an other assets	614,000	620,000
Accrued reserves for product and municipal litigation liabilities	4,000,000.0	3,700,000
Accrued reserves for product and municipal litigation liabilities, Non-current portion	2,900,000	2,600,000
Receivables from insurance carriers, included in other assets	$ 0	$ 1,900,000

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- Definition

Receivables from insurance carriers, included in other assets.

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- Definition

Workers compensation receivable.

+ References

No definition available.

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.24)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid within one year (or the normal operating cycle, if longer).

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer).

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