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v3.8.0.1

Long-term Debt (Narrative) (Details) € in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2018 EUR (€) | Sep. 30, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |
Face Amount | € |  |  | € 160,000 |
Balance of unamortized debt issuance costs | $ 1,654,000 | $ 1,654,000 |  | $ 1,794,000
The Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance of unamortized debt issuance costs | $ 1,654,000 | 1,654,000 |  | 1,794,000
2013 Note Purchase Agreement [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance Date | Oct. 01, 2013 |  |  |
Face Amount | $ 250,000,000 | $ 250,000,000 |  |
Series J Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable interest rate | 3.12% | 3.12% | 3.12% |
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 | 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 |
Foreign Lines of Credit And Overdraft Facilities [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings | $ 0 | $ 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 | 1,000,000,000 |  |
Outstanding borrowings | $ 41,930,000 | $ 41,930,000 |  | $ 32,600,000
Credit facility effective interest rate on outstanding borrowing | 3.28% | 3.28% | 3.28% | 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% |  |  |

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