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Segment Information and Geographic Area Information - Geographic Area Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Apr. 27, 2013
Jan. 26, 2013
Oct. 27, 2012
Jul. 28, 2012
Apr. 28, 2012
Jan. 28, 2012
Oct. 29, 2011
Jul. 30, 2011
Apr. 27, 2013
Apr. 28, 2012
Apr. 30, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 148,359 $ 122,982 $ 129,758 $ 118,737 $ 126,401 $ 112,000 $ 115,890 $ 110,804 $ 519,836 $ 465,095 $ 428,215
Income/(loss) before income taxes                 37,951 11,373 14,462
Property, plant and equipment 98,358       77,152       98,358 77,152 61,511
North America
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 260,287 204,697 172,082
Income/(loss) before income taxes                 (12,162) (31,992) (33,953)
Property, plant and equipment 54,540       39,742       54,540 39,742 26,505
Asia Pacific
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 96,475 111,550 109,049
Income/(loss) before income taxes                 31,081 31,052 34,306
Property, plant and equipment 7,501       8,819       7,501 8,819 7,867
Europe
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 163,074 148,848 147,084
Income/(loss) before income taxes                 19,002 12,025 14,307
Property, plant and equipment 36,317       28,591       36,317 28,591 27,139
Income and expenses not allocated
                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Income/(loss) before income taxes                 $ 30 $ 288 $ (198)