Credit Facilities Credit Facilities (Notes)	3 Months Ended
Mar. 30, 2019
Debt Disclosure [Abstract]
Credit Facilities	15. Credit Facilities On December 17, 2018, the Company entered into a new Credit Agreement (the 2018 Credit Facility) with JPMorgan Chase Bank, N.A., as Administrative Agent and a Lender, and Bank of the West, a Lender (collectively, the Lenders). The 2018 Credit Facility provides for up to $150.0 million of unsecured borrowings in multiple currencies, with an option, subject to certain conditions, for the Company to increase the aggregate borrowing capacity up to $550.0 million in the future with the initial Lenders and additional Lenders, as required. The 2018 Credit Facility also provides for a sublimit of up to $25.0 million for the issuance of letters of credit and a sublimit of $75.0 million for borrowings in specified foreign currencies. All unpaid principal under the 2018 Credit Facility will become due and payable on December 17, 2023. Proceeds from the 2018 Credit Facility are expected to be used for general corporate, capital investment and working capital needs. Borrowings under the 2018 Credit Facility will be deemed, at the Company’s election, either: (a) an Alternate Base Rate (ABR) Loan, which bears interest at the ABR, plus a spread of 0.125% to 1.000% based upon a Company leverage ratio, or (b) a Eurocurrency Loan, which bears interest at the Adjusted LIBO Rate (as defined below), plus a spread of 1.125% to 2.000% based upon a Company net leverage ratio. Subject to certain conditions, the Company may also request swingline loans from time to time that bear interest similar to an ABR Loan. Pursuant to the terms of the 2018 Credit Facility, the ABR is equal to the greatest of (i) the prime rate, (ii) the Federal Reserve Bank of New York effective rate plus 0.50%, and (iii) the one-month Adjusted LIBO Rate plus 1.0%. The Adjusted LIBO Rate is equal to the Eurocurrency Rate (as defined within the 2018 Credit Facility) for the applicable interest period multiplied by the statutory reserve rate for such period, rounded upward, if necessary, to the next 1/16 of 1%. The Company is also obligated under the 2018 Credit Facility to pay an unused fee ranging from 0.150% to 0.275% per annum, based upon a Company leverage ratio, with respect to any unutilized portion of the 2018 Credit Facility. Pursuant to the terms of the 2018 Credit Facility, the Company is subject to certain covenants, including financial covenants related to a net leverage ratio and an interest charge coverage ratio, and other customary negative covenants. The 2018 Credit Facility also includes customary events of default which, upon the occurrence of any such event of default, provide the Lenders with the right to take either or both of the following actions: (a) immediately terminate the commitments, and (b) declare the loans then outstanding immediately due and payable in full. As of March 30, 2019, the 2018 Credit Facility had no outstanding draws and $0.1 million of outstanding letters of credit. The Company was in compliance with all covenants under the 2018 Credit Facility as of March 30, 2019. In January 2016, the Company entered into an Amended and Restated Credit Agreement (Restated Credit Facility) with JPMorgan Chase Bank, N.A., as Administrative Agent and a Lender, Bank of America, as Syndication Agent and a Lender, Citibank, N.A., as Documentation Agent and a Lender, and various other Lenders (collectively, the Lenders). The Company terminated the Restated Credit Facility in February 2018. For the three months ended March 30, 2019 and March 31, 2018, the Company incurred total interest expense of $0.1 million and $0.6 million, respectively, under the 2018 Credit Facility and Restated Credit Facility.

15. Credit Facilities

On December 17, 2018, the Company entered into a new Credit Agreement (the 2018 Credit Facility) with JPMorgan Chase Bank, N.A., as Administrative Agent and a Lender, and Bank of the West, a Lender (collectively, the Lenders). The 2018 Credit Facility provides for up to $150.0 million of unsecured borrowings in multiple currencies, with an option, subject to certain conditions, for the Company to increase the aggregate borrowing capacity up to $550.0 million in the future with the initial Lenders and additional Lenders, as required. The 2018 Credit Facility also provides for a sublimit of up to $25.0 million for the issuance of letters of credit and a sublimit of $75.0 million for borrowings in specified foreign currencies. All unpaid principal under the 2018 Credit Facility will become due and payable on December 17, 2023. Proceeds from the 2018 Credit Facility are expected to be used for general corporate, capital investment and working capital needs.

Borrowings under the 2018 Credit Facility will be deemed, at the Company’s election, either: (a) an Alternate Base Rate (ABR) Loan, which bears interest at the ABR, plus a spread of 0.125% to 1.000% based upon a Company leverage ratio, or (b) a Eurocurrency Loan, which bears interest at the Adjusted LIBO Rate (as defined below), plus a spread of 1.125% to 2.000% based upon a Company net leverage ratio. Subject to certain conditions, the Company may also request swingline loans from time to time that bear interest similar to an ABR Loan. Pursuant to the terms of the 2018 Credit Facility, the ABR is equal to the greatest of (i) the prime rate, (ii) the Federal Reserve Bank of New York effective rate plus 0.50%, and (iii) the one-month Adjusted LIBO Rate plus 1.0%. The Adjusted LIBO Rate is equal to the Eurocurrency Rate (as defined within the 2018 Credit Facility) for the applicable interest period multiplied by the statutory reserve rate for such period, rounded upward, if necessary, to the next 1/16 of 1%. The Company is also obligated under the 2018 Credit Facility to pay an unused fee ranging from 0.150% to 0.275% per annum, based upon a Company leverage ratio, with respect to any unutilized portion of the 2018 Credit Facility.

Pursuant to the terms of the 2018 Credit Facility, the Company is subject to certain covenants, including financial covenants related to a net leverage ratio and an interest charge coverage ratio, and other customary negative covenants. The 2018 Credit Facility also includes customary events of default which, upon the occurrence of any such event of default, provide the Lenders with the right to take either or both of the following actions: (a) immediately terminate the commitments, and (b) declare the loans then outstanding immediately due and payable in full. As of March 30, 2019, the 2018 Credit Facility had no outstanding draws and $0.1 million of outstanding letters of credit. The Company was in compliance with all covenants under the 2018 Credit Facility as of March 30, 2019.

In January 2016, the Company entered into an Amended and Restated Credit Agreement (Restated Credit Facility) with JPMorgan Chase Bank, N.A., as Administrative Agent and a Lender, Bank of America, as Syndication Agent and a Lender, Citibank, N.A., as Documentation Agent and a Lender, and various other Lenders (collectively, the Lenders). The Company terminated the Restated Credit Facility in February 2018.

For the three months ended March 30, 2019 and March 31, 2018, the Company incurred total interest expense of $0.1 million and $0.6 million, respectively, under the 2018 Credit Facility and Restated Credit Facility.