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Components of Interest Expense from Convertible Notes (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 25, 2012
Jun. 27, 2011
Jun. 25, 2012
Jun. 27, 2011
Debt Disclosure [Line Items]        
Contractual coupon interest $ 1,422 $ 1,422 $ 2,844 $ 2,844
Amortization of Convertible Notes debt discount 1,578 1,452 3,123 2,874
Amortization of debt issuance costs 159 147 315 290
Total interest expense from Convertible Notes $ 3,159 $ 3,021 $ 6,282 $ 6,008