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Credit Facilities, Short-term Borrowings and Long-term Debt (Narrative) (Details) |  |  |  |  | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 19, 2019 USD ($) | Jun. 18, 2019 USD ($) | Apr. 03, 2019 USD ($) | Oct. 01, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | May 31, 2018 USD ($) | Sep. 23, 2016 EUR (€) | Oct. 01, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt financing costs |  |  |  |  | $ 2,238,000 | $ 1,325,000 |  |  |  |
Balance of unamortized debt issuance costs |  |  |  |  | 2,589,000 |  | $ 2,895,000 |  |  |
Short-term borrowings |  |  |  |  | 180,000,000 |  | 153,635,000 |  |  |
The Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Balance of unamortized debt issuance costs |  |  |  |  | $ 2,589,000 |  | 2,895,000 |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  | $ 250,000,000
Series J Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  | Nov. 15, 2020 |  |  |  |  |
Effective interest rate |  |  |  |  | 3.77% |  |  |  |  |
Series J Notes [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 1.25% |  |  |  |  |
Series D Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 6.39% |  |  |  |  |
Maturity date |  |  |  |  | Oct. 01, 2018 |  |  |  |  |
Payments of debt |  |  |  | $ 100,000,000 |  |  |  |  |  |
Series F Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  | 8.24% |  |  |  |  |
Maturity date |  |  |  |  | Apr. 03, 2019 |  |  |  |  |
Payments of debt |  |  | $ 43,000,000 |  |  |  |  |  |  |
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 |
Interest rate |  |  |  |  | 1.12% |  |  |  |  |
Maturity date |  |  |  |  | Sep. 23, 2026 |  |  |  |  |
Series N Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  | 77,000,000 |
Interest rate |  |  |  |  | 1.31% |  |  |  |  |
Maturity date |  |  |  |  | Sep. 23, 2028 |  |  |  |  |
Series O Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  | € 43,000,000 |
Interest rate |  |  |  |  | 1.57% |  |  |  |  |
Maturity date |  |  |  |  | Sep. 23, 2031 |  |  |  |  |
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 |  |
Interest rate |  |  |  |  | 4.27% |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2025 |  |  |  |  |
Series Q Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | 85,000,000 |  |
Interest rate |  |  |  |  | 4.35% |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2027 |  |  |  |  |
Series R Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | 75,000,000 |  |
Interest rate |  |  |  |  | 4.41% |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2029 |  |  |  |  |
Series S Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | 75,000,000 |  |
Interest rate |  |  |  |  | 4.46% |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2030 |  |  |  |  |
Series T Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 80,000,000 |  |
Interest rate |  |  |  |  | 4.61% |  |  |  |  |
Maturity date |  |  |  |  | May 30, 2033 |  |  |  |  |
Other Foreign Short-term Borrowings [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  |  | 3,635,000 |  |  |
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] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 0.875% |  |  |  |  |
Revolving Credit Facility [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  | 1.75% |  |  |  |  |
Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Effective interest rate |  |  |  |  |  |  | 3.48% |  |  |
Balance of unamortized debt issuance costs | $ 802,000 |  |  |  |  |  |  |  |  |
Balance of unamortized debt issuance costs, line of credit |  |  |  |  | $ 2,990,000 |  | $ 1,385,000 |  |  |
Line of Credit Facility, Expiration Date |  | Apr. 28, 2020 |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  | 1,000,000,000 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity Extension |  | $ 1,200,000,000 |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  |  |  | 266,541,000 |  |  |
Short-term borrowings |  |  |  |  |  |  | $ 150,000,000 |  |  |
Line of Credit Facility, Minimum Consolidated Net Worth Convenant |  | $ 800,000,000 |  |  |  |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Variable rate basis |  |  |  |  | LIBOR |  |  |  |  |
Effective interest rate |  |  |  |  | 3.54% |  |  |  |  |
Debt financing costs |  |  |  |  | $ 2,238,000 |  |  |  |  |
Line of Credit Facility, Expiration Date | Jun. 19, 2024 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity Extension | $ 1,500,000,000 |  |  |  |  |  |  |  |  |
Outstanding borrowings |  |  |  |  | 361,852,000 |  |  |  |  |
Short-term borrowings |  |  |  |  | $ 180,000,000 |  |  |  |  |
Line of Credit Facility, Minimum Consolidated Net Worth Convenant | $ 1,156,000,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Percentage of Positive Net Income as Part of Amended and Restated Revolving Credit Agreement | 50.00% |  |  |  |  |  |  |  |  |
Line Of Credit Facility, Percentage of Net Cash Proceeds as Part of Amended And Restated | 50.00% |  |  |  |  |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Minimum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.875% |  |  |  |  |
Amended And Restated Revolving Credit Agreement [Member] | Maximum [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% |  |  |  |  |
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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