Borrowings - Other Short-Term Borrowings Narrative (Details) - Other Short-Term Borrowings - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Short-term debt, average outstanding amount	$ 2,935,846	$ 2,184,010	$ 2,200,950
Debt, annualized weighted average interest rate	3.00%	3.00%	3.40%

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (a)

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1402
-Paragraph (b)
-Subparagraph (1)

Name:	us-gaap_ShorttermDebtAverageOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration