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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2019 | Apr. 30, 2018 | May 06, 2013
Debt Instrument [Line Items] |  |  |
Loan agreement |  |  | $ 20,000,000
Letters of credit | $ 6,500,000 | $ 6,500,000 |
Unused and available credit facility | 5,300,000 |  |
Interest Rate Swap Derivatives |  |  |
Debt Instrument [Line Items] |  |  |
Fair value of interest rate swap derivatives | 1,000 | 5,000 |
Bank Guarantees | Letter of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility outstanding | 5,000,000 |  |
Expiration Date 2020 | Bank Guarantees |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers | 2,337,000 |  |
Expiration Date 2021 | Bank Guarantees |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers | 49,000 |  |
Expiration Date 2022 | Bank Guarantees |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers | 75,000 |  |
Expiration Date 2023 | Bank Guarantees |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers | 60,000 |  |
Term Loan A |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility outstanding |  |  | 3,450,000
Periodic payments | $ 79,000 |  |
Fixed rate percentage | 4.37% |  |
Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility outstanding |  |  | $ 1,550,000
Periodic payments | $ 18,000 |  |
Term Loan B | November 3, 2014 Debt Instrument |  |  |
Debt Instrument [Line Items] |  |  |
Fixed rate percentage | 3.07% |  |
Term Loan B | Expiration Date 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers |  | 1,625,000 |
Term Loan B | Expiration Date 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers |  | 21,000 |
Term Loan B | Expiration Date 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers |  | 1,000 |
Term Loan B | Expiration Date 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Bank Guarantees outstanding to customers |  | 63,000 |
Advance Amount One |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility outstanding | $ 9,500,000 | 3,800,000 |
Advance Amount Two |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility outstanding | $ 5,200,000 | $ 5,200,000 |
Advances |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate at period end | 4.00% | 3.50% |
Line of Credit |  |  |
Debt Instrument [Line Items] |  |  |
Debt, variable interest rate | 1.50% |  |
Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal payment for the year 2020 | $ 1,167,000 |  |
Principal payment for the year 2021 | $ 97,000 |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248 + 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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