Debt	6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]
Debt	Debt Senior Unsecured Revolving Credit Facility. The Company's senior unsecured revolving credit facility provides for $700.0 million of revolving loans and has an initial maturity of December 16, 2016. As of June 30, 2013, undrawn letters of credit in the aggregate amount of $12.3 million were treated as issued and outstanding under the senior unsecured revolving credit facility. As of June 30, 2013, the Company had $371.7 million available for additional borrowing under the facility. The Company uses the senior unsecured revolving credit facility for general corporate purposes, which may include working capital, refinancing existing indebtedness, capital expenditures, share repurchases, acquisitions and strategic alliances. The interest rates under the senior unsecured revolving credit facility are based on the Eurocurrency rate at the time of borrowing plus a margin, or the base rate from time to time. The base rate is the higher of (i) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A. as its "prime rate," (ii) the Federal Funds rate plus 50 basis points or (iii) one-month Libor plus 1.00%. The Eurocurrency margin as of June 30, 2013 was 130 basis points. The weighted average Eurocurrency interest rate as of June 30, 2013 was 0.19%, resulting in a weighted average effective Eurocurrency rate, including the margin, of 1.49%, which is the interest applicable to borrowings outstanding under the Eurocurrency rate as of June 30, 2013. At June 30, 2013 and December 30, 2012, the Company had $316.0 million and $258.0 million, respectively, of borrowings in U.S. Dollars outstanding under the senior unsecured revolving credit facility with interest based primarily on the above described Eurocurrency rate. The credit agreement for the facility contains affirmative, negative and financial covenants and events of default customary for financings of this type and similar to those contained in the Company's credit agreement for its previous facility. The financial covenants in the Company's senior unsecured revolving credit facility include a debt-to-capital ratio, two contingent covenants, a maximum consolidated leverage ratio and a minimum consolidated interest coverage ratio, applicable if the Company's credit rating is downgraded below investment grade. 6% Senior Unsecured Notes due 2015. On May 30, 2008, the Company issued $150.0 million aggregate principal amount of senior unsecured notes due 2015 (the “2015 Notes”) in a private placement and received $150.0 million of proceeds from the issuance. The 2015 Notes mature in May 2015 and bear interest at an annual rate of 6%. Interest on the 2015 Notes is payable semi-annually on May 30th and November 30th each year. The Company may redeem some or all of the 2015 Notes at any time, at its option, at a make-whole redemption price plus accrued and unpaid interest. The indenture governing the 2015 Notes includes financial covenants of debt-to-capital ratios and a contingent multiple of total debt to earnings ratio, applicable only if the Company's credit rating is downgraded below investment grade. 5% Senior Unsecured Notes due 2021. On October 25, 2011, the Company issued $500.0 million aggregate principal amount of senior unsecured notes due 2021 (the “2021 Notes”) in a registered public offering and received approximately $496.9 million of net proceeds from the issuance. The 2021 Notes were issued at 99.372% of the principal amount, which resulted in a discount of $3.1 million. The 2021 Notes mature in November 2021 and bear interest at an annual rate of 5%. Interest on the 2021 Notes is payable semi-annually on May 15th and November 15th each year. Prior to August 15, 2021 (three months prior to their maturity date), the Company may redeem the 2021 Notes in whole or in part, at its option, at a redemption price equal to the greater of (i) 100% of the principal amount of the 2021 Notes to be redeemed, plus accrued and unpaid interest, or (ii) the sum of the present values of the remaining scheduled payments of principal and interest in respect to the 2021 Notes being redeemed, discounted on a semi-annual basis, at the Treasury Rate plus 45 basis points, plus accrued and unpaid interest. At any time on or after August 15, 2021 (three months prior to their maturity date), the Company may redeem the 2021 Notes, at its option, at a redemption price equal to 100% of the principal amount of the 2021 Notes to be redeemed plus accrued and unpaid interest. Upon a change of control (as defined in the indenture governing the 2021 Notes ) and a contemporaneous downgrade of the 2021 Notes below investment grade, each holder of 2021 Notes will have the right to require the Company to repurchase such holder's 2021 Notes for 101% of their principal amount, plus accrued and unpaid interest. Financing Lease Obligations. In September 2012, the Company entered into agreements with the lessors of buildings that the Company is currently occupying and leasing to expand those buildings. The Company provided a portion of the funds needed for the construction of the additions to the buildings, which resulted in the Company being considered the owner of the buildings during the construction period. At the end of the construction period, the Company will not be reimbursed by the lessors for all of the construction costs. The Company is therefore deemed to have continuing involvement and the leases will qualify as financing leases under sale-leaseback accounting guidance, representing debt obligations for the Company and non-cash investing and financing activities. As a result, the Company capitalized $29.3 million in property and equipment, net, representing the fair value of the buildings with a corresponding increase to debt. The Company has capitalized $11.8 million of the expected $15.0 million in additional construction costs to complete the renovations to the buildings, which were partially funded by the lessors. At June 30, 2013, the Company had $40.8 million recorded for these financing lease obligations, of which $2.2 million was recorded as short-term debt and $38.6 million was recorded as long-term debt. At December 30, 2012, the Company had $34.6 million recorded for these financing lease obligations, of which $1.7 million was recorded as short-term debt and $32.9 million was recorded as long-term debt. The buildings are being depreciated on a straight-line basis over the terms of the leases to their estimated residual values, which will equal the remaining financing obligation at the end of the lease term. At the end of the lease term, the remaining balances in property, plant and equipment, net and debt will be reversed against each other.

Debt

Senior Unsecured Revolving Credit Facility. The Company's senior unsecured revolving credit facility provides for $700.0 million of revolving loans and has an initial maturity of December 16, 2016. As of June 30, 2013, undrawn letters of credit in the aggregate amount of $12.3 million were treated as issued and outstanding under the senior unsecured revolving credit facility. As of June 30, 2013, the Company had $371.7 million available for additional borrowing under the facility. The Company uses the senior unsecured revolving credit facility for general corporate purposes, which may include working capital, refinancing existing indebtedness, capital expenditures, share repurchases, acquisitions and strategic alliances. The interest rates under the senior unsecured revolving credit facility are based on the Eurocurrency rate at the time of borrowing plus a margin, or the base rate from time to time. The base rate is the higher of (i) the rate of interest in effect for such day as publicly announced from time to time by Bank of America, N.A. as its "prime rate," (ii) the Federal Funds rate plus 50 basis points or (iii) one-month Libor plus 1.00%. The Eurocurrency margin as of June 30, 2013 was 130 basis points. The weighted average Eurocurrency interest rate as of June 30, 2013 was 0.19%, resulting in a weighted average effective Eurocurrency rate, including the margin, of 1.49%, which is the interest applicable to borrowings outstanding under the Eurocurrency rate as of June 30, 2013. At June 30, 2013 and December 30, 2012, the Company had $316.0 million and $258.0 million, respectively, of borrowings in U.S. Dollars outstanding under the senior unsecured revolving credit facility with interest based primarily on the above described Eurocurrency rate. The credit agreement for the facility contains affirmative, negative and financial covenants and events of default customary for financings of this type and similar to those contained in the Company's credit agreement for its previous facility. The financial covenants in the Company's senior unsecured revolving credit facility include a debt-to-capital ratio, two contingent covenants, a maximum consolidated leverage ratio and a minimum consolidated interest coverage ratio, applicable if the Company's credit rating is downgraded below investment grade.

6% Senior Unsecured Notes due 2015. On May 30, 2008, the Company issued $150.0 million aggregate principal amount of senior unsecured notes due 2015 (the “2015 Notes”) in a private placement and received $150.0 million of proceeds from the issuance. The 2015 Notes mature in May 2015 and bear interest at an annual rate of 6%. Interest on the 2015 Notes is payable semi-annually on May 30th and November 30th each year. The Company may redeem some or all of the 2015 Notes at any time, at its option, at a make-whole redemption price plus accrued and unpaid interest. The indenture governing the 2015 Notes includes financial covenants of debt-to-capital ratios and a contingent multiple of total debt to earnings ratio, applicable only if the Company's credit rating is downgraded below investment grade.

5% Senior Unsecured Notes due 2021. On October 25, 2011, the Company issued $500.0 million aggregate principal amount of senior unsecured notes due 2021 (the “2021 Notes”) in a registered public offering and received approximately $496.9 million of net proceeds from the issuance. The 2021 Notes were issued at 99.372% of the principal amount, which resulted in a discount of $3.1 million. The 2021 Notes mature in November 2021 and bear interest at an annual rate of 5%. Interest on the 2021 Notes is payable semi-annually on May 15th and November 15th each year. Prior to August 15, 2021 (three months prior to their maturity date), the Company may redeem the 2021 Notes in whole or in part, at its option, at a redemption price equal to the greater of (i) 100% of the principal amount of the 2021 Notes to be redeemed, plus accrued and unpaid interest, or (ii) the sum of the present values of the remaining scheduled payments of principal and interest in respect to the 2021 Notes being redeemed, discounted on a semi-annual basis, at the Treasury Rate plus 45 basis points, plus accrued and unpaid interest. At any time on or after August 15, 2021 (three months prior to their maturity date), the Company may redeem the 2021 Notes, at its option, at a redemption price equal to 100% of the principal amount of the 2021 Notes to be redeemed plus accrued and unpaid interest. Upon a change of control (as defined in the indenture governing the 2021 Notes ) and a contemporaneous downgrade of the 2021 Notes below investment grade, each holder of 2021 Notes will have the right to require the Company to repurchase such holder's 2021 Notes for 101% of their principal amount, plus accrued and unpaid interest.

Financing Lease Obligations. In September 2012, the Company entered into agreements with the lessors of buildings that the Company is currently occupying and leasing to expand those buildings. The Company provided a portion of the funds needed for the construction of the additions to the buildings, which resulted in the Company being considered the owner of the buildings during the construction period. At the end of the construction period, the Company will not be reimbursed by the lessors for all of the construction costs. The Company is therefore deemed to have continuing involvement and the leases will qualify as financing leases under sale-leaseback accounting guidance, representing debt obligations for the Company and non-cash investing and financing activities. As a result, the Company capitalized $29.3 million in property and equipment, net, representing the fair value of the buildings with a corresponding increase to debt. The Company has capitalized $11.8 million of the expected $15.0 million in additional construction costs to complete the renovations to the buildings, which were partially funded by the lessors. At June 30, 2013, the Company had $40.8 million recorded for these financing lease obligations, of which $2.2 million was recorded as short-term debt and $38.6 million was recorded as long-term debt. At December 30, 2012, the Company had $34.6 million recorded for these financing lease obligations, of which $1.7 million was recorded as short-term debt and $32.9 million was recorded as long-term debt. The buildings are being depreciated on a straight-line basis over the terms of the leases to their estimated residual values, which will equal the remaining financing obligation at the end of the lease term. At the end of the lease term, the remaining balances in property, plant and equipment, net and debt will be reversed against each other.