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Long-Term Debt and Lines of Credit - Lines of Credit - Narrative (Detail)			12 Months Ended		0 Months Ended	12 Months Ended				0 Months Ended		12 Months Ended
	Apr. 27, 2014 United States [Member] Revolving Credit Facility [Member] USD ($)	Apr. 28, 2013 United States [Member] Revolving Credit Facility [Member] USD ($)	Apr. 27, 2014 United States [Member] Revolving Credit Facility [Member] New Credit Agreement [Member]	Aug. 13, 2013 United States [Member] Revolving Credit Facility [Member] New Credit Agreement [Member] USD ($)	Apr. 28, 2013 United States [Member] Revolving Credit Facility [Member] Amended and Restated Credit Agreement on April 28, 2013 [Member] USD ($)	Apr. 27, 2014 United States [Member] Revolving Credit Facility [Member] Amended and Restated Credit Agreement on April 28, 2013 [Member]	Apr. 27, 2014 China [Member] Revolving credit agreement [Member] USD ($)	Apr. 27, 2014 China [Member] Revolving credit agreement [Member] CNY	Apr. 28, 2013 China [Member] Revolving credit agreement [Member] USD ($)	May 09, 2014 China [Member] Revolving credit agreement [Member] Subsequent Event [Member] USD ($)	May 09, 2014 China [Member] Revolving credit agreement [Member] Subsequent Event [Member] CNY	Apr. 27, 2014 Poland [Member] Revolving credit agreement [Member] USD ($)	Apr. 27, 2014 Poland [Member] Revolving credit agreement [Member] PLN	Apr. 28, 2013 Poland [Member] Revolving credit agreement [Member] USD ($)	Apr. 28, 2013 Poland [Member] Revolving credit agreement [Member] PLN	May 02, 2014 Poland [Member] Revolving credit agreement [Member] Subsequent Event [Member] USD ($)	May 02, 2014 Poland [Member] Revolving credit agreement [Member] Subsequent Event [Member] EUR (€)
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 10,000,000	$ 7,600,000		$ 6,500,000	40,000,000		$ 6,500,000	40,000,000
Expiration date			Aug. 31, 2015		Aug. 25, 2013		Jun. 08, 2014	Jun. 08, 2014		May 09, 2015	May 09, 2015	Aug. 31, 2015	Aug. 31, 2015
Interest rate description			Interest is charged at a rate equal to the one-month LIBOR rate plus a spread based on our ratio of debt to EBITDA as defined in the agreement			This agreement provided for a pricing matrix to determine the interest rate payable on loans made under this agreement.	This agreement has an interest rate determined by the Chinese government	This agreement has an interest rate determined by the Chinese government				Agreement with Wells Fargo that bears interest at WIBOR (Warsaw Interbank Offered Rate) plus 2%	Agreement with Wells Fargo that bears interest at WIBOR (Warsaw Interbank Offered Rate) plus 2%
Reference rate on which the interest rate is based			One-month LIBOR rate									Warsaw Interbank Offered Rate	Warsaw Interbank Offered Rate
Applicable interest rate at end of period			1.75%									4.38%	4.38%	5.25%	5.25%	2.31%	2.31%
Letter of credit, outstanding amount	195,000	195,000
Outstanding amount	$ 0	$ 0					$ 0	0	$ 0			$ 586,000	1,800,000	$ 561,000	1,800,000	$ 588,000	€ 424,000
Percent added to reference rate in effect from time to time to set the interest rate												2.00%	2.00%

X

- 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

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.

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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

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
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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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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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



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

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- 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



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-Name Regulation S-X (SX)

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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



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-Name Regulation S-X (SX)

-Number 210

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-Paragraph 19, 22

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