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Lines of Credit - Narrative (Detail) |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2018 USD ($) | Feb. 01, 2018 USD ($) | Nov. 01, 2017 USD ($) | Aug. 01, 2017 USD ($) | Apr. 30, 2017 USD ($) | May 01, 2016 USD ($) | May 03, 2015 USD ($) | Apr. 30, 2017 CNY (¥) | Aug. 03, 2016 USD ($) | Aug. 01, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Interest paid during the year |  |  |  |  | $ 114,000 | $ 95,000 | $ 268,000 |  |  |
United States [Member] | Third Amendment to Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum amount of letters of credit |  |  |  |  |  |  |  |  |  | $ 7,500,000
Letters of credit outstanding, additional amount |  |  |  |  |  |  |  |  | $ 5,000,000 |
United States [Member] | Third Amendment to Credit Agreement [Member] | Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Automatic reduction of the additional letter of credit | $ 1,250,000 | $ 1,250,000 | $ 1,250,000 | $ 1,250,000 |  |  |  |  |  |
United States [Member] | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 30,000,000 |  |  |  |  |
Interest rate description |  |  |  |  | Interest was charged at a rate as a variable spread over LIBOR based on our ratio of debt to EBITDA. |  |  |  |  |
Applicable interest rate at end of period |  |  |  |  | 2.45% | 1.89% |  | 2.45% |  |
Expiration date |  |  |  |  | Aug. 15, 2018 |  |  |  |  |
Reference rate on which the interest rate is based |  |  |  |  | LIBOR |  |  |  |  |
Percentage of common stock in subsidiary pledge as collateral |  |  |  |  | 65.00% |  |  |  |  |
Outstanding amount |  |  |  |  | $ 0 | $ 0 |  |  |  |
Letters of credit, outstanding amount |  |  |  |  | 250,000 | 250,000 |  |  |  |
China [Member] | Revolving credit agreement [Member] |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 5,800,000 |  |  | ¥ 40,000,000 |  |
Interest rate description |  |  |  |  | This agreement has an interest rate determined by the Chinese government |  |  |  |  |
Expiration date |  |  |  |  | Feb. 15, 2018 |  |  |  |  |
Outstanding amount |  |  |  |  | $ 0 | $ 0 |  | ¥ 0 |  |

X
- Definition The additional amount of the contingent obligation under letters of credit outstanding. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the automatic reduction of the additional letter of credit. + References No definition available. + Details
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Balance Type: | debit
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- Definition The percentage of equity interest pledge as collateral under the credit agreement. + References No definition available. + Details
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X
- Definition Amount represents maximum amount of letters of credit that can be issued. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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X
- 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://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(22)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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X
- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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