Derivative Financial Instruments (Details)	1 Months Ended					3 Months Ended		6 Months Ended
	Oct. 31, 2015 USD ($)	Aug. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jan. 31, 2014 USD ($) agreement	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)	Dec. 26, 2015 USD ($)	Dec. 27, 2014 USD ($)	Sep. 28, 2015 USD ($)	Sep. 23, 2015 USD ($)	Jun. 27, 2015 USD ($)	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 (in years)		10 years
Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Notional amount of derivative		$ 500,000,000			$ 2,000,000,000
Cash paid for settlement of cash flow hedge	$ 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		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						$ 0	$ (6,401,000)	0	(9,670,000)
Hedging Instrument | Interest rate swap agreements: | Cash Flow Hedge Relationships:
Derivative [Line Items]
(Gain) loss recognized in other comprehensive income						0	0	5,682,000	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						2,962,000	(2,660,000)	6,134,000	(2,865,000)
Hedging Instrument | Other assets | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements						3,936,000	4,802,000	3,936,000	4,802,000			$ 12,597,000
Hedging Instrument | Accrued expenses | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements
Hedging Instrument | Other liabilities | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements						$ 6,575,000		$ 6,575,000
Hedging Instrument | Other long-term liabilities | Interest rate swap agreements:
Derivative [Line Items]
Fair value of interest rate swap agreements							$ 152,000		$ 152,000
Six Part Senior Notes Offering
Derivative [Line Items]
Debt instrument face amount			5,000,000,000
Senior Notes October 2024 | Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Term of forecasted debt issuance (in years)					10 years
Senior Notes October 2044 | Jan 2014 Forward Starting Swaps
Derivative [Line Items]
Term of forecasted debt issuance (in years)					30 years
Senior Notes, Maturing in October 2024
Derivative [Line Items]
Debt instrument face amount				$ 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]
Debt instrument face amount				$ 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
Senior Notes
Derivative [Line Items]
Senior notes	2,000,000,000									$ 2,000,000,000.0
Commercial Paper
Derivative [Line Items]
Debt instrument face amount	500,000,000
September 23, 2015
Derivative [Line Items]
Value of shares repurchased	$ 1,500,000,000.0									$ 1,500,000,000.0	$ 1,500,000,000.0