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Long-Term Debt and Lines of Credit - Lines of Credit - Narrative (Detail) PLN in Millions			12 Months Ended
		Jul. 10, 2015	May. 03, 2015 USD ($)	Apr. 27, 2014 USD ($)	Apr. 28, 2013 USD ($)	May. 03, 2015 CNY (¥)	May. 02, 2014 USD ($)	May. 02, 2014 EUR (€)	Apr. 27, 2014 PLN
Line of Credit Facility [Line Items]
Capital expenditures	[1]		$ 11,174,000	$ 5,310,000	$ 4,457,000
United States [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 10,000,000
Interest rate description			Interest was charged at a rate equal to the one-month LIBOR rate plus a spread based on the ratio of debt to EBITDA as defined in the agreement.
Expiration date			Aug. 31, 2015
Reference rate on which the interest rate is based			One-month LIBOR rate
Applicable interest rate at end of period			1.78%	1.75%		1.78%			1.75%
Letters of credit, outstanding amount			$ 250,000	$ 195,000
Outstanding amount			0	0
Capital expenditure limit for fiscal 2015			12,000,000	10,000,000
Capital expenditures			10,500,000
United States [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Expiration date		Aug. 31, 2017
China [Member] | Revolving credit agreement [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 6,400,000			¥ 40,000,000
Interest rate description			This agreement has an interest rate determined by the Chinese government.
Expiration date			Feb. 09, 2016
Outstanding amount			$ 0	$ 0		¥ 0
Poland [Member] | Revolving credit agreement [Member]
Line of Credit Facility [Line Items]
Interest rate description			Our applicable interest rate was converted to EURO LIBOR plus 2%.
Expiration date			Aug. 31, 2015
Reference rate on which the interest rate is based			EURO LIBOR
Applicable interest rate at end of period				4.38%					4.38%
Outstanding amount			$ 0	$ 586,000			$ 588,000	€ 424,000	PLN 1.8
Percent added to reference rate in effect from time to time to set the interest rate			2.00%	2.00%
Poland [Member] | Revolving credit agreement [Member] | Interest rate description for April 27, 2014 [Member]
Line of Credit Facility [Line Items]
Interest rate description			Agreement with Wells Fargo that incurred interest at WIBOR (Warsaw Interbank Offered Rate) plus 2%
Reference rate on which the interest rate is based			Warsaw Interbank Offered Rate
[1] Capital expenditure amounts are stated on an accrual basis. See Consolidated Statement of Cash Flows for capital expenditure amounts on a cash basis.

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The limitation on capital expenditures for the current fiscal year under the credit agreement.

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Total expenditures for additions to long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets of the reportable segment; if the amount: (a) is included in the determination of segment assets reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in the determination of segment assets.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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- 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.

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-Name Accounting Standards Codification



-Topic 942



-SubTopic 210



-Section S99



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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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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.

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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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