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Self-Insurance Reserves - Additional Information (Detail) - USD ($) | Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015 | Apr. 30, 2014
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Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs | $ 8,663,000 | $ 10,082,000 | $ 9,610,000 | $ 9,185,000
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, Non-current portion | 4,800,000 | 5,800,000 |  |
Reserves for workers' compensation, product liability, municipal liability, and medical/dental costs, included in accrued expenses | 3,600,000 | 4,300,000 |  |
Workers' compensation receivable classified as an other assets | 590,000 | 621,000 |  |
Accrued reserves for product and municipal litigation liabilities | 3,200,000 | 3,800,000 |  |
Accrued reserves for product and municipal litigation liabilities, Non-current portion | 2,900,000 | 3,100,000 |  |
Receivables from insurance carriers, included in other assets | $ 1,900,000 | $ 1,900,000 |  |

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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition 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://www.xbrl.org/2003/role/presentationRef -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=6877327&loc=d3e13212-122682 + Details
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