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Borrowings outstanding.

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Debt - Additional Information (Details)								9 Months Ended
Debt - Additional Information (Details)	Jul. 07, 2022 USD ($)	Jul. 07, 2022 EUR (€)	Mar. 22, 2022 USD ($)	Mar. 12, 2021 USD ($)	Feb. 26, 2021 EUR (€)	Sep. 27, 2019 USD ($)	Dec. 07, 2018 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jul. 07, 2022 EUR (€)	Sep. 30, 2021 USD ($)	Jul. 01, 2015 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment of debt								$ (8,200,000)	$ (1,100,000)
Fair value of debt								7,900,000,000			$ 9,000,000,000.0
4.00% Senior Notes Due March 2023 [Member]
Debt Instrument [Line Items]
Redemption amount of long term debt			$ 350,000,000
Debt instrument, interest rate			4.00%
Debt instrument maturity period in Month and year			2023-03
Loss on extinguishment of debt			$ (8,200,000)
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity	$ 2,300,000,000
Debt Instrument, Term, in Years	5 years	5 years
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Unused commitment fee	0.225%	0.225%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Unused commitment fee	0.08%	0.08%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit spread adjustment	0.10%	0.10%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.50%	1.50%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| CDOR Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.50%	1.50%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| CDOR Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| EURIBOR Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.50%	1.50%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| EURIBOR Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SONIA Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.50%	1.50%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SONIA Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Base Rate [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.50%	0.50%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Base Rate [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.00%	0.00%
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Debt Instrument [Line Items]
Applicable margin	0.50%	0.50%
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Debt Instrument [Line Items]
Applicable margin	0.00%	0.00%
Revolving Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Canadian Prime Rate Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
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Applicable margin	0.50%	0.50%
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Debt Instrument [Line Items]
Applicable margin	0.00%	0.00%
Revolving Credit Facility [Member] \| Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Termination of credit facility	$ 2,300,000,000
Prior Revolving Credit Facility [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity												$ 2,300,000,000
Long-term debt								0			0
Prior Farm Loan Credit Facility [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity						$ 600,000,000
Long-term debt								599,100,000			598,900,000
Debt Instrument, Term, in Years						7 years
Restated Farm Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity	$ 600,000,000
Debt Instrument, Term, in Years	7 years	7 years
Credit facility, amount of potential increase to the principal amount	$ 400,000,000
Restated Farm Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit spread adjustment	0.10%	0.10%
Restated Farm Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	2.275%	2.275%
Restated Farm Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.65%	1.65%
Restated Farm Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Base Rate [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.275%	1.275%
Restated Farm Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Base Rate [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.65%	0.65%
Receivables Securitization Facility [Member] \| Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt								120,000,000.0			0
Receivables backed financing, maximum borrowing amount				$ 700,000,000.0
Debt instrument, amended maturity date				Mar. 11, 2024
Debt instrument, maximum borrowing capacity, amount								700,000,000.0			690,300,000
Loans and Leases Receivable, Collateral for Secured Borrowings								1,423,000,000.0			1,318,400,000
Receivables Securitization Facility [Member] \| Secured Debt [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Variable rate basis				one-month LIBOR
Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] \| Unsecured Debt [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity \| €					€ 600,000,000.0
Long-term debt								170,000,000.0			270,000,000.0
Debt instrument, maturity period					3 years
Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] \| Unsecured Debt [Member] \| Foreign Exchange Contract [Member]
Debt Instrument [Line Items]
Amount of foreign exchange contracts								170,400,000
Cooperatieve Rabobank U.A., New York Branch European Revolving Credit Facility [Member] \| Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Termination of credit facility \| €		€ 600,000,000.0
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity \| €										€ 700,000,000.0
Debt instrument, maturity period	3 years	3 years
Incremental line of credit \| €										€ 100,000,000.0
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Unused commitment fee	0.275%	0.275%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Unused commitment fee	0.10%	0.10%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit spread adjustment	0.10%	0.10%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.625%	1.625%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SOFR Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| EURIBOR Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.625%	1.625%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| EURIBOR Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SONIA Loans [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	1.625%	1.625%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| SONIA Loans [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.875%	0.875%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Base Rate [Member] \| Maximum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.625%	0.625%
Rabobank Credit Facility [Member] \| Senior Unsecured Debt [Member] \| Base Rate [Member] \| Minimum [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Applicable margin	0.00%	0.00%
Commercial Paper [Member] \| Unsecured Short Term Debt [Member]
Debt Instrument [Line Items]
Aggregate Principal Amount of Short-term Unsecured Commercial Paper Program, Maximum							$ 1,000,000,000.0
Debt Instrument, notice period for termination							30 days
Debt instrument, issued amount								$ 182,800,000
Borrowings outstanding											$ 0
Commercial Paper [Member] \| Unsecured Short Term Debt [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, maturity period							397 days
U.S. Revolving Facility [Member] \| Senior Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity	$ 1,800,000,000
Multicurrency Revolving Facility [Member] \| Senior Unsecured Debt [Member] \| Subsequent Event [Member]
Debt Instrument [Line Items]
Credit Facility, maximum borrowing capacity	$ 500,000,000