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Derivative Instruments and Hedging Activities (Narrative) (Details) € in Thousands, ¥ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Mar. 31, 2018 EUR (€) | Sep. 30, 2017 CNY (¥) | Sep. 30, 2017 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative | $ 0 | $ 0 | $ 0 | $ 0 |  |  |
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings | $ 72 |  |  |  |  |  |
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI | 12 months |  |  |  |  |  |
Face Amount | € |  |  |  |  | € 160,000 |  |
EUR Denominated Loan [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary | $ (1,268) | (664) | (2,011) | $ 2,150 |  |  |
Intercompany Loan [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Gain (loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary |  | $ 281 | 735 |  |  |  |
Value of Net Investment Hedging Instruments Used | ¥ |  |  |  |  |  | ¥ 160,000 |
Total Accumulated Other Comprehensive (Loss) Earnings [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Unrecognized gains (loss) | $ 182 |  | $ 182 |  |  |  | $ 218
Series D Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Issuance Date |  |  | Oct. 01, 2008 |  |  |  |
Series F Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Issuance Date |  |  | Apr. 01, 2009 |  |  |  |
2013 Note Purchase Agreement [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Issuance Date | Oct. 01, 2013 |  |  |  |  |  |
Face Amount | $ 250,000 |  | $ 250,000 |  |  |  |
First Closing Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Issuance Date |  |  | Oct. 01, 2013 |  |  |  |
Second Closing Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Issuance Date |  |  | Nov. 15, 2013 |  |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Issuance Date | Sep. 23, 2016 |  | Sep. 23, 2016 |  |  |  |
Face Amount | € |  |  |  |  | 160,000 |  |
Series M Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Face Amount | € |  |  |  |  | 40,000 |  |
Series N Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Face Amount | € |  |  |  |  | 77,000 |  |
Series O Notes [Member] |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |
Face Amount | € |  |  |  |  | € 43,000 |  |

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