The average effective interest rate during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Subparagraph (SX 210.5-02.22(a)(1))
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 210
-SubTopic 10
-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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The effective interest rate during the reporting period.

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-Topic 210
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-Section S99
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Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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Debt and Bank Credit Facilities (Details Of The Senior Notes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Senior Notes	$ 500.0
Senior Notes
Debt Instrument [Line Items]
Senior Notes	$ 500.0
Senior Notes \| Floating Rate Series 2007A Mature In August 2017 [Member]
Debt Instrument [Line Items]
Spread on variable interest rate	1.60%	1.10%
Senior Notes \| Fixed Rate Series 2011A Mature In July 2018 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 100.0
Debt instrument interest rate	4.10%
Senior Notes \| Fixed Rate Series 2011A Mature In July 2021 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 230.0
Senior Notes \| Fixed Rate Series 2011A Mature In July 2023 [Member]
Debt Instrument [Line Items]
Senior Notes	$ 170.0
Minimum \| Senior Notes \| Fixed Rate Series 2011A Mature In July 2021 [Member]
Debt Instrument [Line Items]
Stated rate, minimum	4.80%
Minimum \| Senior Notes \| Fixed Rate Series 2011A Mature In July 2023 [Member]
Debt Instrument [Line Items]
Stated rate, minimum	4.90%
Maximum \| Senior Notes \| Fixed Rate Series 2011A Mature In July 2021 [Member]
Debt Instrument [Line Items]
Stated rate, minimum	5.00%
Maximum \| Senior Notes \| Fixed Rate Series 2011A Mature In July 2023 [Member]
Debt Instrument [Line Items]
Stated rate, minimum	5.10%