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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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No definition available.

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Derivative Financial Instruments (Details) - Hedging Instrument £ in Millions	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 USD ($)	Aug. 31, 2016 EUR (€)	Jul. 02, 2016 USD ($)	Dec. 26, 2015 USD ($)
Interest rate swap agreements \| Net Investment Hedging
Derivative [Line Items]
Fair value of derivative assets \| €		€ 500,000,000
Fuel swaps \| Cash Flow Hedging
Derivative [Line Items]
Notional Value			$ 32,400,000
Cross-currency swaps
Derivative [Line Items]
Notional Value \| £	£ 234.2
Cross-currency swaps \| Net Investment Hedging
Derivative [Line Items]
Notional Value \| €				€ 534,000,000
Other assets \| Interest rate swap agreements \| Fair Value Hedging
Derivative [Line Items]
Fair value of derivative assets			1,149,000		$ 36,805,000	$ 3,936,000
Other assets \| Fuel swaps \| Cash Flow Hedging
Derivative [Line Items]
Fair value of derivative liabilities			3,950,000		0	0
Other assets \| Cross-currency swaps \| Cash Flow Hedging
Derivative [Line Items]
Fair value of derivative liabilities			9,027,000		0	0
Other assets \| Foreign currency swaps \| Net Investment Hedging
Derivative [Line Items]
Fair value of derivative assets			28,395,000		0	0
Other assets \| Interest rate swap agreements \| Fair Value Hedging
Derivative [Line Items]
Fair value of derivative liabilities			25,391,000		0	6,575,000
Other assets \| Foreign currency forwards \| Cash Flow Hedging
Derivative [Line Items]
Fair value of derivative assets			1,048,000		0	0
Other assets \| Foreign currency swaps \| Net Investment Hedging
Derivative [Line Items]
Fair value of derivative liabilities			$ 15,915,000		$ 0	$ 0