Derivative Financial Instruments (Details)	1 Months Ended				3 Months Ended
	Aug. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jan. 31, 2014 USD ($) agreement	Sep. 26, 2015 USD ($)	Sep. 27, 2014 USD ($)	Aug. 31, 2013 USD ($)
Derivative [Line Items]
Cash received from termination of interest rate swap agreements					$ 14,496,000	$ 0
Interest rate swap agreements:
Derivative [Line Items]
Term of forecasted debt issuance	10 years
Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Notional amount of derivative	$ 500,000,000			$ 2,000,000,000
Interest rate swap agreement					6,100,000
Interest Rate Swap2018
Derivative [Line Items]
Notional amount of derivative		$ 500,000,000					$ 500,000,000
October 2020
Derivative [Line Items]
Notional amount of derivative		750,000,000
Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Number of interest rate derivatives held | agreement				2
Hedging Instrument | Interest rate swap agreements: | Fair Value Hedge Relationships: | Interest expense
Derivative [Line Items]
(Gain) loss on interest rate swap agreements recorded to interest expense					(1,997,000)	(3,269,000)
Hedging Instrument | Interest rate swap agreements: | Cash Flow Hedge Relationships:
Derivative [Line Items]
(Gain) loss recognized in other comprehensive income					6,134,000	55,374,000
Hedging Instrument | Interest rate swap agreements: | Cash Flow Hedge Relationships: | Interest expense
Derivative [Line Items]
(Gain) loss on interest rate contracts reclassified from accumulated other comprehensive income to interest expense					2,720,000	205,000
Hedging Instrument | Other assets | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements					8,219,000	264,000
Hedging Instrument | Other liabilities | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements					$ 0
Hedging Instrument | Other long-term liabilities | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements						$ 3,496,000
Six Part Senior Notes Offering
Derivative [Line Items]
Par Value (in millions)		5,000,000,000
Senior Notes October 2024 | Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Term of forecasted debt issuance				10 years
Senior Notes October 2044 | Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Term of forecasted debt issuance				30 years
Senior Notes, Maturing in October 2024
Derivative [Line Items]
Par Value (in millions)			$ 1,250,000,000
Senior Notes, Maturing in October 2024 | Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Cash paid for settlement of cash flow hedge			58,900,000
Senior Notes, Maturing in October 2044
Derivative [Line Items]
Par Value (in millions)			$ 1,000,000,000
Senior Notes, Maturing in October 2044 | Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Cash paid for settlement of cash flow hedge		$ 129,900,000