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Convertible Notes Payable - Summary of Notes Due 2020 (Details) (Convertible Notes Payable [Member], 4.0% Convertible Senior Notes due December 15, 2020 [Member], USD $) In Thousands, unless otherwise specified	Jul. 31, 2013	Dec. 27, 2012
Convertible Notes Payable [Member] \| 4.0% Convertible Senior Notes due December 15, 2020 [Member]
Debt Instrument [Line Items]
Liability component, Principal balance	$ 189,587
Liability component, Unamortized discount	16,455
Liability component, Net carrying amount	173,132
Equity component, Net carrying amount	$ 43,131	$ 43,100

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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