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Long-term Debt and Other Credit Arrangements - Additional Information (Detail) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 12, 2018 | May 06, 2013 | Apr. 30, 2018 | Apr. 30, 2017
Debt Instrument [Line Items] |  |  |  |
Loan agreement |  | $ 20,000,000 |  |
Letters of credit |  |  | $ 6,500,000 |
Loan agreement, Maturity date | Mar. 01, 2021 | May 01, 2018 |  |
Interest rate description |  |  | The borrowing rate under the Line of Credit at that date was 3.50%. Monthly interest payments under the Line of Credit were payable at the Daily One Month LIBOR interest rate plus 1.50% per annum. |
Unused and available credit facility |  |  | $ 11,000,000 |
Interest Rate Swap Derivatives [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of interest rate swap derivatives |  |  | 5,000 | $ 62,000
Bank Guarantees [Member] | Letter of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding |  |  | 5,000,000 |
Expiration Date Two Thousand And Nineteen [Member] | Bank Guarantees [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  | 1,625,000 |
Expiration Date Two Thousand And Twenty [Member] | Bank Guarantees [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  | 21,000 |
Expiration Date Two Thousand And Twenty One [Member] | Bank Guarantees [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  | 1,000 |
Expiration Date Two Thousand And Twenty Three [Member] | Bank Guarantees [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  | 63,000 |
Term Loan A [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding |  | $ 3,450,000 |  |
Loan agreement, Maturity date |  | May 01, 2020 |  |
Periodic payments |  |  | $ 79,000 |
Term loan, Payment terms |  |  | Payments are due under Term Loan A in consecutive equal monthly principal payments in the amount of $79,000 until May 1, 2020, and at that time, all principal, accrued unpaid interest and other charges outstanding under Term Loan A shall be due and payable in full. |
Fixed rate percentage |  |  | 4.37% |
Term Loan B [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding |  | $ 1,550,000 |  |
Loan agreement, Maturity date |  | May 01, 2020 |  |
Periodic payments |  |  | $ 18,000 |
Term loan,Payment terms |  |  | $ 0 | 0
Term Loan B [Member] | November Three Twenty Fourteen [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fixed rate percentage |  |  | 3.07% |
Term Loan B [Member] | Expiration Date Two Thousand And Nineteen [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  |  | 112,000
Term Loan B [Member] | Expiration Date Two Thousand And Twenty [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  |  | 117,000
Term Loan B [Member] | Expiration Date Two Thousand And Eighteen [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Bank Guarantees outstanding to customers |  |  |  | 1,403,000
Line of Credit [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, variable interest rate |  |  | 1.50% |
Advance Amount One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding |  |  | $ 3,800,000 | 3,500,000
Advance Amount Two [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Credit facility outstanding |  |  | $ 5,200,000 | $ 4,200,000
Advances [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate at period end |  |  | 3.50% | 2.50%
Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal payment for the year 2019 |  |  | $ 1,167,000 |
Principal payment for the year 2020 |  |  | 1,167,000 |
Principal payment for the year 2021 |  |  | $ 97,000 |

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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 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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