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

No definition available.

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDescription
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Long-Term Debt and Lines of Credit - Lines of Credit Narrative (Detail)	12 Months Ended					12 Months Ended		3 Months Ended		12 Months Ended						0 Months Ended
	Apr. 28, 2013 China [Member] Revolving credit agreement [Member] USD ($)	Apr. 28, 2013 China [Member] Revolving credit agreement [Member] CNY	Apr. 29, 2012 China [Member] Revolving credit agreement [Member] USD ($)	Apr. 28, 2013 United States [Member] Amended and Restated Credit Agreement [Member] USD ($)	Apr. 29, 2012 United States [Member] Amended and Restated Credit Agreement [Member] USD ($)	Apr. 28, 2013 United States [Member] Revolving Credit Facility [Member] Amended and Restated Credit Agreement [Member] USD ($)	Apr. 29, 2012 United States [Member] Revolving Credit Facility [Member] Amended and Restated Credit Agreement [Member] USD ($)	Apr. 28, 2013 Poland [Member] Revolving credit agreement [Member] USD ($)	Apr. 28, 2013 Poland [Member] Revolving credit agreement [Member] PLN	Apr. 28, 2013 Poland [Member] Revolving credit agreement [Member] USD ($)	Apr. 28, 2013 Poland [Member] Revolving credit agreement [Member] PLN	Jan. 07, 2013 Poland [Member] Revolving credit agreement [Member]	Apr. 29, 2012 Poland [Member] Revolving credit agreement [Member] USD ($)	Apr. 29, 2012 Poland [Member] Revolving credit agreement [Member] PLN	Jan. 17, 2012 Poland [Member] Revolving credit agreement [Member] PLN	Jun. 08, 2013 Renewal of Credit Agreement [Member] China [Member] Revolving credit agreement [Member] USD ($)	Jun. 08, 2013 Renewal of Credit Agreement [Member] China [Member] Revolving credit agreement [Member] CNY
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 6,400,000	40,000,000				$ 7,600,000		$ 2,100,000	6,800,000	$ 2,100,000	6,800,000				6,800,000	$ 6,400,000	40,000,000
Expiration date	Sep. 02, 2013	Sep. 02, 2013				Aug. 25, 2013		Aug. 25, 2013	Aug. 25, 2013			Jan. 15, 2013				Jun. 08, 2014	Jun. 08, 2014
Applicable interest rate at end of period						1.80%		5.25%	5.25%	5.25%	5.25%
Interest rate description	This agreement has an interest rate determined by the Chinese government	This agreement has an interest rate determined by the Chinese government				This agreement provides for a pricing matrix to determine the interest rate payable on loans made under the agreement				This agreement bears interest at WIBOR (Warsaw Interbank Offered Rate) plus 2%	This agreement bears interest at WIBOR (Warsaw Interbank Offered Rate) plus 2%
Letter of credit, outstanding amount				195,000	0
Outstanding amount	$ 0		$ 0			$ 0	$ 0	$ 561,000	1,800,000	$ 561,000	1,800,000		$ 889,000	2,800,000
Percent added to reference rate in effect from time to time to set the interest rate										2.00%	2.00%
Reference rate on which the interest rate is based										Warsaw Interbank Offered Rate	Warsaw Interbank Offered Rate