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Long-term Debt (Narrative) (Details) € in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 USD ($) | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Face Amount | € |  |  | € 160,000 |  |
Debt financing costs |  | $ 1,325,000 |  |  |
Balance of unamortized debt issuance costs |  |  |  | $ 2,850,000 | $ 1,794,000
The Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Balance of unamortized debt issuance costs |  |  |  | 2,850,000 | 1,794,000
2013 Note Purchase Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | Oct. 01, 2013 |  |  |
Face Amount |  |  |  | $ 250,000,000 |
Series J Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 3.58% | 3.58% |
First Closing Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | Oct. 01, 2013 |  |  |
Second Closing Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | Nov. 15, 2013 |  |  |
Series D Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | Oct. 01, 2008 |  |  |
Series F Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | Apr. 01, 2009 |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | Sep. 23, 2016 |  |  |
Face Amount | € |  |  | € 160,000 |  |
Series M Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount | € |  |  | 40,000 |  |
Series N Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount | € |  |  | 77,000 |  |
Series O Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount | € |  |  | € 43,000 |  |
2018 Note Purchase Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issuance Date |  | May 31, 2018 |  |  |
Face Amount |  |  |  | $ 400,000,000 |
Prepayment, Maximum Percentage of Principal |  | 100.00% |  |  |
Prepayment, Partial Payment Minimum |  | $ 1,000,000 |  |  |
Event of Default, Interest Rate Increase |  |  | 2.00% | 2.00% |
Series P Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount |  |  |  | $ 85,000,000 |
Interest rate |  |  | 4.27% | 4.27% |
Maturity date |  | May 30, 2025 |  |  |
Series Q Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount |  |  |  | $ 85,000,000 |
Interest rate |  |  | 4.35% | 4.35% |
Maturity date |  | May 30, 2027 |  |  |
Series R Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount |  |  |  | $ 75,000,000 |
Interest rate |  |  | 4.41% | 4.41% |
Maturity date |  | May 30, 2029 |  |  |
Series S Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount |  |  |  | $ 75,000,000 |
Interest rate |  |  | 4.46% | 4.46% |
Maturity date |  | May 30, 2030 |  |  |
Series T Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face Amount |  |  |  | $ 80,000,000 |
Interest rate |  |  | 4.61% | 4.61% |
Maturity date |  | May 30, 2033 |  |  |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding borrowings |  |  |  | $ 3,769,000 | 0
Revolving Credit Agreement [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Variable Rate Basis | LIBOR |  |  |  |
Line of Credit Facility, Expiration Date |  | Apr. 01, 2020 |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | 1,000,000,000 |
Outstanding borrowings |  |  |  | $ 374,574,000 | $ 32,600,000
Credit facility effective interest rate on outstanding borrowing |  |  | 2.87% | 2.87% | 2.29%
Revolving Credit Agreement [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis Spread On Variable Rate |  | 0.85% |  |  |
Revolving Credit Agreement [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis Spread On Variable Rate |  | 1.65% |  |  |
Cross Currency Interest Rate Contract [Member] | Series P Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 1.82% | 1.82% |
Cross Currency Interest Rate Contract [Member] | Series Q Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 2.15% | 2.15% |
Cross Currency Interest Rate Contract [Member] | Series R Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 2.42% | 2.42% |
Cross Currency Interest Rate Contract [Member] | Series S Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 2.55% | 2.55% |
Cross Currency Interest Rate Contract [Member] | Series T Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Effective interest rate |  |  | 2.90% | 2.90% |

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