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Quarterly Data and Share Information - Consolidated Financial Data (Parenthetical) (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 30, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Jan. 01, 2012
Oct. 02, 2011
Jul. 03, 2011
Apr. 03, 2011
Dec. 30, 2012
Jan. 01, 2012
Jan. 02, 2011
Schedule Of Quarterly Financial Data [Line Items]                      
Restructuring and asset impairment charges       $ 16,300,000              
Restructuring charges 2,300,000 800,000     5,800,000            
Net loss 7,392,000 (5,773,000) 10,258,000 (5,934,000) 3,915,000 12,168,000 12,814,000 9,824,000 5,943,000 38,721,000 8,283,000
Fire at Australian manufacturing facility [Member]
                      
Schedule Of Quarterly Financial Data [Line Items]                      
Net loss $ 700,000 $ 1,000,000