Debt - Narrative (Details)			9 Months Ended
	Jun. 26, 2025 USD ($)	Oct. 01, 2024 USD ($)	Jun. 30, 2025 USD ($) credit_facility	Jun. 30, 2024 USD ($)	Sep. 30, 2024 USD ($)
Line Of Credit Facility [Line Items]
Proceeds from issuance of long-term debt			$ 1,143,447,000	$ 1,240,204,000
Maximum debt-to-total-capitalization ratio			70.00%
Debt-to-total-capitalization ratio			0.41
Minimum
Line Of Credit Facility [Line Items]
Outstanding indebtedness			$ 15,000,000
Maximum
Line Of Credit Facility [Line Items]
Outstanding indebtedness			$ 100,000,000
Unsecured 5.00% Senior Notes, due December 2054
Line Of Credit Facility [Line Items]
Interest rate			5.00%
Unsecured 5.00% Senior Notes, due December 2054 | Senior Notes
Line Of Credit Facility [Line Items]
Debt face amount		$ 650,000,000
Interest rate		5.00%
Effective rate		3.90%
Proceeds from issuance of long-term debt		$ 639,400,000
Unsecured 5.20% Senior Notes, due August 2035
Line Of Credit Facility [Line Items]
Interest rate			5.20%
Unsecured 5.20% Senior Notes, due August 2035 | Senior Notes
Line Of Credit Facility [Line Items]
Debt face amount	$ 500,000,000
Interest rate	5.20%
Effective rate	5.35%
Proceeds from issuance of long-term debt	$ 493,900,000
Five Year Unsecured Revolving Credit Agreement | Commercial Paper
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,500,000,000
Debt agreement term			5 years
Five Year Unsecured Revolving Credit Agreement, March 28, 2029
Line Of Credit Facility [Line Items]
Outstanding commercial paper			$ 0		$ 0
Five Year Unsecured Revolving Credit Agreement, March 28, 2029 | Minimum | Base Rate
Line Of Credit Facility [Line Items]
Interest rate spread			0.00%
Five Year Unsecured Revolving Credit Agreement, March 28, 2029 | Minimum | Term SOFR
Line Of Credit Facility [Line Items]
Interest rate spread			0.75%
Five Year Unsecured Revolving Credit Agreement, March 28, 2029 | Maximum | Base Rate
Line Of Credit Facility [Line Items]
Interest rate spread			0.25%
Five Year Unsecured Revolving Credit Agreement, March 28, 2029 | Maximum | Term SOFR
Line Of Credit Facility [Line Items]
Interest rate spread			1.25%
Five Year Unsecured Revolving Credit Agreement, March 28, 2029 | Commercial Paper
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,500,000,000
Accordion feature			250,000,000
Maximum borrowing capacity post accordion feature			1,750,000,000
Five Year Unsecured Revolving Credit Agreement, March 28, 2029 | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 3,100,000,000
Number of credit facilities | credit_facility			4
$1.5 Billion Revolving Credit Facility | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,500,000,000
Debt agreement term			3 years
Accordion feature			$ 250,000,000
Maximum borrowing capacity post accordion feature			1,750,000,000
Outstanding borrowings			$ 0		0
$1.5 Billion Revolving Credit Facility | Revolving Credit Facility | Minimum | Base Rate
Line Of Credit Facility [Line Items]
Interest rate spread			0.00%
$1.5 Billion Revolving Credit Facility | Revolving Credit Facility | Minimum | Term SOFR
Line Of Credit Facility [Line Items]
Interest rate spread			0.75%
$1.5 Billion Revolving Credit Facility | Revolving Credit Facility | Maximum | Base Rate
Line Of Credit Facility [Line Items]
Interest rate spread			0.25%
$1.5 Billion Revolving Credit Facility | Revolving Credit Facility | Maximum | Term SOFR
Line Of Credit Facility [Line Items]
Interest rate spread			1.25%
$50 Million Bank Loan Agreement | Line of Credit
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 50,000,000
Debt agreement term			364 days
Outstanding borrowings			$ 0		$ 0
$50 Million Revolving Credit Facility
Line Of Credit Facility [Line Items]
Outstanding borrowings			0
$50 Million Revolving Credit Facility | Revolving Credit Facility
Line Of Credit Facility [Line Items]
Maximum borrowing capacity			$ 50,000,000
Debt agreement term			364 days
Remaining borrowing capacity			$ 44,400,000