Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of total debt		$ 8,300,000
Not Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of total debt	$ 8,800,000	8,400,000	$ 9,400,000
Carrying value of total debt	8,700,000	8,300,000	9,000,000
Recurring Fair Value Measurements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	366,373	199,404	330,394
Other assets	163,067	163,519
Total assets at fair value	529,440	362,923	330,394
Recurring Fair Value Measurements | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	366,173	169,214	287,203
Other assets	163,067	163,519
Total assets at fair value	529,240	332,733	287,203
Recurring Fair Value Measurements | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	200	30,190	43,191
Other assets	0	0
Total assets at fair value	200	30,190	43,191
Recurring Fair Value Measurements | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0	0
Other assets	0	0
Total assets at fair value	$ 0	$ 0	$ 0