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Financing Arrangements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 25, 2016
Short-term borrowings [Abstract] |  |
Line of credit facility, available borrowing capacity | $ 1,000,000 |
Maturities of the notes, maximum | 397 days |
Commercial paper program, notes outstanding | $ 137,500 | $ 163,300
Commercial paper program, weighted average interest rate | 1.85% | 0.97%
Unsecured Committed [Member] |  |
Short-term borrowings [Abstract] |  |
Maturity Date, Line of credit facility | Mar. 30, 2020 |
Line of credit facility, available borrowing capacity | $ 1,000,000 |
Commitment fee based on unused portion of line of credit facility | 0.12% |
Interest rate under line of credit facility | Eurocurrency Rate plus 1.125%. |
Unsecured Uncommitted [Member] |  |
Short-term borrowings [Abstract] |  |
Line of credit facility, available borrowing capacity | $ 146,000 |
Weighted average interest rates of outstanding borrowings | 4.32% | 8.17%

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- Definition The weighted average interest rate of notes outstanding relating to the Company's Commercial Paper Program at the balance sheet date. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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