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Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
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Jan. 31, 2020 | May 31, 2013
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Outstanding advances under the long-term debt | $ 3,300 |
May 1, 2013 to August 1, 2017 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Outstanding advances under the long-term debt |  | $ 3,450
Interest rate swap, conversion rate |  | 4.875%
Interest rate swap, beginning date of conversion | May 01, 2013 |
Interest rate swap, ending date of conversion | Aug. 01, 2017 |
August 1, 2017 to May 1, 2020 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Outstanding advances under the long-term debt |  | $ 2,600
Interest rate swap, conversion rate |  | 4.37%
Interest rate swap, beginning date of conversion | Aug. 01, 2017 |
Interest rate swap, ending date of conversion | May 01, 2020 |
November 3, 2014 to May 1, 2020 |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Outstanding advances under the long-term debt |  | $ 1,218
Interest rate swap, conversion rate |  | 3.07%
Interest rate swap, beginning date of conversion | Nov. 03, 2014 |
Interest rate swap, ending date of conversion | May 01, 2020 |

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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Date the entity entered into the derivative contract, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition Date the derivative contract matures, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
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- Details
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