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Lines of Credit and Paycheck Protection Program Loan - Narrative (Detail)			1 Months Ended	9 Months Ended	12 Months Ended
		Jun. 30, 2020	Jun. 30, 2020 USD ($)	Jan. 31, 2021 USD ($)	May 02, 2021 USD ($)	Jan. 31, 2021 CNY (¥)	May 03, 2020 USD ($)		Apr. 15, 2020 USD ($)	Feb. 02, 2020 USD ($)
Line Of Credit Facility [Line Items]
Outstanding amount							$ 29,750,000	[1]		$ 0
Repayments of debt				$ 30,772,000
Paycheck Protection Program (PPP) loan amount	[1]						$ 7,606,000
Paycheck Protection Program, CARES Act [Member]
Line Of Credit Facility [Line Items]
Paycheck Protection Program (PPP) loan amount									$ 7,600,000
Revolving Credit Facility [Member] | United States [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity				$ 30,000,000
Expiration date				Aug. 15, 2022
Maximum amount of letters of credit				$ 1,000,000
Applicable interest rate at end of period				1.72%		1.72%	1.75%			3.11%
Interest rate description				Interest is charged at a rate as a variable spread over LIBOR based on our ratio of debt to EBITDA.
Reference rate on which the interest rate is based				LIBOR
Percentage of common stock in subsidiary pledge as collateral				65.00%
Outstanding amount				$ 0			$ 29,800,000			$ 0
Additional borrowings amount				0
Repayments of debt			$ 29,800,000
Letters of credit, outstanding amount				275,000			$ 250,000			$ 250,000
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Reduced percentage of allowable liens and other indebtedness			5.00%
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Maximum allowable payment of dividends or stock repurchase			$ 10,000,000
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Scenario Forecast [Member]
Line Of Credit Facility [Line Items]
Annual capital expenditures					$ 10,000,000
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level I [Member]
Line Of Credit Facility [Line Items]
Percentage of pricing matrix increased		1.60%
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level II [Member]
Line Of Credit Facility [Line Items]
Percentage of pricing matrix increased		2.05%
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level III [Member]
Line Of Credit Facility [Line Items]
Percentage of pricing matrix increased		2.50%
Revolving Credit Facility [Member] | United States [Member] | Seventh Amendment to Credit Agreement [Member] | Price Level IV [Member]
Line Of Credit Facility [Line Items]
Percentage of pricing matrix increased		3.00%
Revolving Credit Facility [Member] | United States [Member] | Letters of Credit [Member]
Line Of Credit Facility [Line Items]
Remaining letters of credit				725,000
Revolving credit agreements [Member] | China [Member] | Chinese Yuan Renminbi [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity				$ 6,200,000		¥ 40,000,000
Expiration date				Dec. 04, 2020
Applicable interest rate at end of period							2.41%
Interest rate description				This agreement has an interest rate determined by the Chinese government at the time of borrowing.
Outstanding amount				$ 0			$ 1,000,000.0
Additional borrowings amount				0
Repayments of debt			$ 1,000,000.0
Revolving credit agreements [Member] | China [Member] | United States Dollar [Member]
Line Of Credit Facility [Line Items]
Maximum borrowing capacity				$ 2,000,000
Expiration date				Jul. 07, 2021
Interest rate description				This agreement has an interest rate determined by the Chinese government at the time of borrowing.
Outstanding amount				$ 0
[1] Derived from audited financial statements.

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Covenant maximum amount to pay dividends and repurchasing stock.

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The percentage of equity interest pledge as collateral under the credit agreement.

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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.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Date the credit facility terminates, in CCYY-MM-DD format.

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The effective interest rate at the end of the reporting period.

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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).

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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.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying value as of the balance sheet date of the noncurrent portion 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.

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