Significant Accounting Policies	9 Months Ended
Sep. 25, 2011
Presentation of Condensed Consolidated Financial Statements [Abstract]
BasisOfPresentationSignificantAccountingPoliciesAndPriorPeriodAdjustments [Text Block]	Presentation of Condensed Consolidated Financial Statements During interim periods, we follow the accounting policies set forth in our Annual Report on Form 10-K for the fiscal year ended December 26, 2010 and apply appropriate interim financial reporting standards for a fair statement of our operating results and financial position in conformity with accounting principles generally accepted in the United States of America, as codified by the Financial Accounting Standards Board (FASB) in the Accounting Standards Codification (ASC) (referred to herein as U.S. GAAP), as indicated below. Users of financial information produced for interim periods in 2011 are encouraged to read this Quarterly Report on Form 10-Q in conjunction with our consolidated financial statements and notes thereto filed with the Securities and Exchange Commission (SEC) in our 2010 Annual Report on Form 10-K. Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time, including the use of estimated effective tax rates. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results. We use a 4-4-5 convention for our fiscal quarters, which are thirteen week periods generally ending on the last Sunday of each calendar quarter. We refer to these thirteen week fiscal periods as “quarters” throughout this report. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the SEC’s requirements for Form 10-Q and contain all adjustments, of a normal and recurring nature, which are necessary for a fair statement of (i) the condensed consolidated income statements for the thirteen and thirty-nine week periods ended September 25, 2011 and September 26, 2010, (ii) the condensed consolidated balance sheets at September 25, 2011 and December 26, 2010, (iii) the condensed consolidated statements of cash flows for the thirty-nine week periods ended September 25, 2011 and September 26, 2010, and (iv) the condensed consolidated statement of shareholders’ equity and comprehensive income for the thirty-nine week period ended September 25, 2011. However, the accompanying unaudited condensed consolidated financial statements do not include all information and notes required by U.S. GAAP. The condensed consolidated balance sheet, included in this report, as of December 26, 2010 was derived from our 2010 audited financial statements, but does not include all disclosures required by U.S. GAAP. New Accounting Pronouncement In June 2011, authoritative guidance was issued on the presentation of comprehensive income. Specifically, the guidance allows an entity to present components of net income and other comprehensive income in one continuous statement, referred to as the statement of comprehensive income, or in two separate but consecutive statements. The new guidance eliminates the current option to report other comprehensive income and its components in the statement of changes in equity. This guidance will be applied retrospectively and will be effective for our interim and annual reporting periods beginning after December 15, 2011. We expect to add a new primary consolidated statement of other comprehensive income, which will immediately follow our consolidated statements of operations, to our filings when applicable. Prior Period Adjustments As of December 27, 2009, we had invested approximately $25.7 million in short-term fixed deposits with financial institutions that had original maturities greater than three months and less than or equal to one year. As of September 26, 2010, these short-term fixed deposits decreased to $24.2 million. These fixed deposits were originally reported as cash and cash equivalents in the third quarter of 2010. As such, we have revised our previously reported condensed consolidated statement of cash flows for the third quarter of 2010 to reflect an increase of approximately $24.2 million in short-term investments, a $24.2 million decrease in cash and cash equivalents, an increase in the purchase of investments by $22.1 million, and the redemption of $23.6 million of investments related to the maturity of these short-term fixed deposits. These revisions correct the misclassification made in presenting these fixed deposits as cash and cash equivalents. The corrections had no effect on our previously reported condensed consolidated statements of operations, condensed consolidated statements of shareholders' equity or the net cash provided by operating activities and the cash used in financing activities within the condensed consolidated statement of cash flows, and is not considered material to any previously reported consolidated financial statements.

Presentation of Condensed Consolidated Financial Statements

During interim periods, we follow the accounting policies set forth in our Annual Report on Form 10-K for the fiscal year ended December 26, 2010 and apply appropriate interim financial reporting standards for a fair statement of our operating results and financial position in conformity with accounting principles generally accepted in the United States of America, as codified by the Financial Accounting Standards Board (FASB) in the Accounting Standards Codification (ASC) (referred to herein as U.S. GAAP), as indicated below. Users of financial information produced for interim periods in 2011 are encouraged to read this Quarterly Report on Form 10-Q in conjunction with our consolidated financial statements and notes thereto filed with the Securities and Exchange Commission (SEC) in our 2010 Annual Report on Form 10-K.

Interim financial reporting standards require us to make estimates that are based on assumptions regarding the outcome of future events and circumstances not known at that time, including the use of estimated effective tax rates. Inevitably, some assumptions will not materialize, unanticipated events or circumstances may occur which vary from those estimates and such variations may significantly affect our future results. Additionally, interim results may not be indicative of our results for future interim periods or our annual results.

We use a 4-4-5 convention for our fiscal quarters, which are thirteen week periods generally ending on the last Sunday of each calendar quarter. We refer to these thirteen week fiscal periods as “quarters” throughout this report. The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with the SEC’s requirements for Form 10-Q and contain all adjustments, of a normal and recurring nature, which are necessary for a fair statement of (i) the condensed consolidated income statements for the thirteen and thirty-nine week periods ended September 25, 2011 and September 26, 2010, (ii) the condensed consolidated balance sheets at September 25, 2011 and December 26, 2010, (iii) the condensed consolidated statements of cash flows for the thirty-nine week periods ended September 25, 2011 and September 26, 2010, and (iv) the condensed consolidated statement of shareholders’ equity and comprehensive income for the thirty-nine week period ended September 25, 2011. However, the accompanying unaudited condensed consolidated financial statements do not include all information and notes required by U.S. GAAP. The condensed consolidated balance sheet, included in this report, as of December 26, 2010 was derived from our 2010 audited financial statements, but does not include all disclosures required by U.S. GAAP.

New Accounting Pronouncement

In June 2011, authoritative guidance was issued on the presentation of comprehensive income. Specifically, the guidance allows an entity to present components of net income and other comprehensive income in one continuous statement, referred to as the statement of comprehensive income, or in two separate but consecutive statements. The new guidance eliminates the current option to report other comprehensive income and its components in the statement of changes in equity. This guidance will be applied retrospectively and will be effective for our interim and annual reporting periods beginning after December 15, 2011. We expect to add a new primary consolidated statement of other comprehensive income, which will immediately follow our consolidated statements of operations, to our filings when applicable.

Prior Period Adjustments

As of December 27, 2009, we had invested approximately $25.7 million in short-term fixed deposits with financial institutions that had original maturities greater than three months and less than or equal to one year. As of September 26, 2010, these short-term fixed deposits decreased to $24.2 million. These fixed deposits were originally reported as cash and cash equivalents in the third quarter of 2010. As such, we have revised our previously reported condensed consolidated statement of cash flows for the third quarter of 2010 to reflect an increase of approximately $24.2 million in short-term investments, a $24.2 million decrease in cash and cash equivalents, an increase in the purchase of investments by $22.1 million, and the redemption of $23.6 million of investments related to the maturity of these short-term fixed deposits. These revisions correct the misclassification made in presenting these fixed deposits as cash and cash equivalents. The corrections had no effect on our previously reported condensed consolidated statements of operations, condensed consolidated statements of shareholders' equity or the net cash provided by operating activities and the cash used in financing activities within the condensed consolidated statement of cash flows, and is not considered material to any previously reported consolidated financial statements.