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Fair Value Measurements - Additional Information (Detail) (USD $)
3 Months Ended 3 Months Ended 3 Months Ended
Sep. 29, 2012
Mar. 31, 2012
Sep. 29, 2012
Omni Guide Incorporation
Sep. 29, 2012
Omni Guide Incorporation
Other Assets
Mar. 31, 2012
Omni Guide Incorporation
Other Assets
Sep. 29, 2012
Omni Guide Incorporation
Series D Preferred Stock
Sep. 29, 2012
Omni Guide Incorporation
Series E Preferred Stock
Jul. 02, 2011
Auction Rate Securities
Apr. 02, 2011
Auction Rate Securities
Jul. 02, 2011
Auction Rate Securities
Accumulated Net Unrealized Investment Gain (Loss), Reclassification Adjustments
Apr. 02, 2011
Auction Rate Securities Converted To Preferred Stock
Jul. 02, 2011
Preferred Stock
Schedule of Available-for-sale Securities                        
Auction rate securities, fair value                 $ 5,200,000      
Auction rate securities, par value                 10,700,000   4,000,000  
Proceeds from sale of securities               6,000,000       500,000
Gain on sale of securities               2,700,000   1,400,000    
Investment in preferred stock 8,966,000 8,966,000   9,000,000 9,000,000 6,000,000 3,000,000          
Ownership interest     11.00%                  
Investments maturity within one year 125,700,000                      
Investments maturity between one to five years $ 10,500,000