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Long-Term Debt and Lines of Credit - Lines of Credit Narrative (Detail)
9 Months Ended 9 Months Ended 9 Months Ended
Jan. 27, 2013
United States [Member]
Amended and Restated Credit Agreement [Member]
USD ($)
Apr. 29, 2012
United States [Member]
Amended and Restated Credit Agreement [Member]
USD ($)
Jan. 27, 2013
United States [Member]
Amended and Restated Credit Agreement [Member]
Revolving Credit Facility [Member]
USD ($)
Apr. 29, 2012
United States [Member]
Amended and Restated Credit Agreement [Member]
Revolving Credit Facility [Member]
USD ($)
Jan. 27, 2013
China [Member]
Revolving credit agreement [Member]
USD ($)
Jan. 27, 2013
China [Member]
Revolving credit agreement [Member]
CNY
Apr. 29, 2012
China [Member]
Revolving credit agreement [Member]
USD ($)
Jan. 27, 2013
Poland [Member]
Revolving credit agreement [Member]
USD ($)
Jan. 27, 2013
Poland [Member]
Revolving credit agreement [Member]
PLN
Apr. 29, 2012
Poland [Member]
Revolving credit agreement [Member]
USD ($)
Apr. 29, 2012
Poland [Member]
Revolving credit agreement [Member]
PLN
Jan. 17, 2012
Poland [Member]
Revolving credit agreement [Member]
PLN
Line of Credit Facility [Line Items]                        
Maximum borrowing capacity     $ 7,600,000   $ 6,400,000 40,000,000   $ 2,200,000 6,800,000     6,800,000
Expiration date     Aug. 25, 2013   Sep. 02, 2013 Sep. 02, 2013   Aug. 25, 2013 Aug. 25, 2013      
Applicable interest rate at end of period     1.80%         6.00% 6.00%      
Interest rate description     This agreement provides for a pricing matrix to determine the interest rate payable on loans made under the agreement   This agreement has an interest rate determined by the Chinese government This agreement has an interest rate determined by the Chinese government   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 $ 576,000 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