Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Attributable To Redeemable Noncontrolling Interests [Abstract]
Redeemable noncontrolling interests	$ 282,502	$ 832,138	$ 607,636
Estimate of Fair Value Measurement [Member]
Debt Instrument, Fair Value Disclosure [Abstract]
Fair value of debt	2,157,700	1,666,100
Fair value, measurements, recurring [Member]
Assets [Abstract]
Derivative contracts - assets	18,135	11,799
Total assets	18,135	11,799
Liabilities [Abstract]
Derivative contracts - liabilities	2,824	2,089
Total liabilities	2,824	2,089
Attributable To Redeemable Noncontrolling Interests [Abstract]
Redeemable noncontrolling interests	282,502	832,138
Fair value, measurements, recurring [Member] \| Level 1 [Member]
Assets [Abstract]
Derivative contracts - assets	0	0
Total assets	0	0
Liabilities [Abstract]
Derivative contracts - liabilities	0	0
Total liabilities	0	0
Attributable To Redeemable Noncontrolling Interests [Abstract]
Redeemable noncontrolling interests	0	0
Fair value, measurements, recurring [Member] \| Level 2 [Member]
Assets [Abstract]
Derivative contracts - assets	18,135	11,799
Total assets	18,135	11,799
Liabilities [Abstract]
Derivative contracts - liabilities	2,824	2,089
Total liabilities	2,824	2,089
Attributable To Redeemable Noncontrolling Interests [Abstract]
Redeemable noncontrolling interests	0	0
Fair value, measurements, recurring [Member] \| Level 3 [Member]
Assets [Abstract]
Derivative contracts - assets	0	0
Total assets	0	0
Liabilities [Abstract]
Derivative contracts - liabilities	0	0
Total liabilities	0	0
Attributable To Redeemable Noncontrolling Interests [Abstract]
Redeemable noncontrolling interests	$ 282,502	$ 832,138

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of financial and nonfinancial obligations.

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