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Debt (Tables)
 12 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Components of Long-Term Debt Including Associated Interest Rates and Related Fair Values
Components of long-term debt including the associated interest rates and related fair values by calendar maturity (in millions, except interest rates):
 
Sep 30, 2018
 
Oct 1, 2017
 
Stated Interest Rate
Effective Interest Rate (1)
Issuance
Face Value
Estimated Fair Value
 
Face Value
Estimated Fair Value
 
2018 notes
$
350.0

$
350

 
$
350.0

$
352

 
2.000
%
2.012
%
2020 notes (2)
500.0

490

 
—

—

 
2.200
%
2.228
%
2021 notes
500.0

489

 
500.0

501

 
2.100
%
2.293
%
2021 notes
250.0

244

 
250.0

250

 
2.100
%
1.600
%
2022 notes
500.0

486

 
500.0

508

 
2.700
%
2.819
%
2023 notes (6)
750.0

759

 
750.0

806

 
3.850
%
2.859
%
2023 notes (3)
1,000.0

986

 
—

—

 
3.100
%
3.107
%
2024 notes (5)
748.4

743

 
755.3

760

 
0.372
%
0.462
%
2025 notes (4)
1,250.0

1,249

 
—

—

 
3.800
%
3.721
%
2026 notes
500.0

451

 
500.0

481

 
2.450
%
2.511
%
2028 notes (3)
600.0

576

 
—

—

 
3.500
%
3.529
%
2028 notes (4)
750.0

754

 
—

—

 
4.000
%
3.958
%
2045 notes
350.0

330

 
350.0

381

 
4.300
%
4.348
%
2047 notes (2)
500.0

438

 
—

—

 
3.750
%
3.765
%
2048 notes (4)
1,000.0

977

 
—

—

 
4.500
%
4.504
%
   Total
9,548.4

9,322

 
3,955.3

4,039

 
 
 
Aggregate debt issuance costs and unamortized premium/(discount), net
(69.3
)
 
 
(17.5
)
 
 
 
 
Hedge accounting fair value adjustment(6)
(39.0
)
 
 
(5.2
)
 
 
 
 
   Total
$
9,440.1

 
 
$
3,932.6

 
 
 
 
(1)
Includes the effects of the amortization of any premium or discount and any gain or loss upon settlement of related treasury locks or forward-starting interest rate swaps utilized to hedge the interest rate risk prior to the debt issuance.
(2) Issued in November 2017.
(3) Issued in February 2018.
(4)
Issued in August 2018.
(5) Japanese yen-denominated long-term debt.
(6) Amount represents the change in fair value due to changes in benchmark interest rates related to our 2023 notes. Refer to Note 3, Derivative Financial Instruments, for additional information on our interest rate swap designated as a fair value hedge.
Schedule of Maturities of Long-term Debt [Table Text Block]
The following table summarizes our long-term debt maturities as of September 30, 2018 by fiscal year (in millions):
Fiscal Year
Total
2019
$
350.0

2020
—

2021
1,250.0

2022
500.0

2023
1,000.0

Thereafter
6,448.4

Total
$
9,548.4