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v3.20.1

Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | May 31, 2018 USD ($) | Sep. 23, 2016 EUR (€) | Oct. 01, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Balance of unamortized debt issuance costs | $ 2,299,000 | $ 2,478,000 |  |  |
Short-term borrowings | 100,000,000 | 220,000,000 |  |  |
The Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Balance of unamortized debt issuance costs | $ 2,299,000 | 2,478,000 |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  |  |  | $ 250,000,000
2016 Note Purchase Agreements [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance date | Sep. 23, 2016 |  |  |  |
Face amount | € |  |  |  | € 160,000,000 |
Series M Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | € |  |  |  | 40,000,000 |
Series N Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | € |  |  |  | 77,000,000 |
Series O Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount | € |  |  |  | € 43,000,000 |
2018 Note Purchase Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | $ 400,000,000 |  |
Series P Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  | 85,000,000 | 85,000,000 |  |
Series Q Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | 85,000,000 |  |
Series R Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | 75,000,000 |  |
Series S Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | 75,000,000 |  |
Series T Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount |  |  | $ 80,000,000 |  |
Notes Payable to Banks [Member] | Series J Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | Nov. 15, 2020 |  |  |  |
Effective interest rate | 2.94% |  |  |  |
Notes Payable to Banks [Member] | Series J Notes [Member] | LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.25% |  |  |  |
Notes Payable to Banks [Member] | Series M Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | Sep. 23, 2026 |  |  |  |
Notes Payable to Banks [Member] | Series N Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | Sep. 23, 2028 |  |  |  |
Notes Payable to Banks [Member] | Series O Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | Sep. 23, 2031 |  |  |  |
Notes Payable to Banks [Member] | Series P Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | May 30, 2025 |  |  |  |
Notes Payable to Banks [Member] | Series Q Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | May 30, 2027 |  |  |  |
Notes Payable to Banks [Member] | Series R Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | May 30, 2029 |  |  |  |
Notes Payable to Banks [Member] | Series S Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | May 30, 2030 |  |  |  |
Notes Payable to Banks [Member] | Series T Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | May 30, 2033 |  |  |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Short-term borrowings | $ 0 | 0 |  |  |
Revolving Credit Facility [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maturity date | Jun. 19, 2024 |  |  |  |
Revolving Credit Facility [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 0.875% |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.75% |  |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Balance of unamortized debt issuance costs, line of credit | $ 2,541,000 | $ 2,840,000 |  |  |
Cross Currency Interest Rate Swaps [Member] | Series P Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate | 1.82% |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series Q Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate | 2.15% |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series R Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate | 2.42% |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series S Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate | 2.55% |  |  |  |
Cross Currency Interest Rate Swaps [Member] | Series T Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate | 2.90% |  |  |  |

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