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Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended
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Apr. 30, 2017 USD ($) Case Claim | Apr. 30, 2016 USD ($) | Apr. 30, 2015 USD ($)
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Number of Product liability cases | Case | 3 |  |
Number of Other product liability claims | Claim | 12 |  |
Defense and administrative costs | $ 254,000 | $ 264,000 | $ 252,000
Settlement fees related to product liability cases | 209,000 | 55,000 | 177,000
Gain from changes in product liability provisions | 364,000 |  |
Expense related to changes in product liability and municipal litigation liability |  | 299,000 | 183,000
Environmental reserve in non-current liabilities | 730,000 | 694,000 |
Rent expense | 4,400,000 | 4,100,000 | $ 3,300,000
General and Administrative Expense |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Insurance recovery as a result of an insurance settlement agreement |  | $ 1,800,000 |
Minimum |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Compensatory damages sought | 75,000 |  |
Maximum |  |  |
Schedule Of Commitments And Contingencies [Line Items] |  |  |
Compensatory damages sought | $ 350,000 |  |

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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable after twelve months or beyond the next operating cycle if longer. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 10 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 4: 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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