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Derivative Instruments and Hedging Activities (Narrative) (Details) € in Thousands, ¥ in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended | 15 Months Ended | 18 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2013 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Sep. 30, 2013 | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 CNY (¥) | Jun. 30, 2016 CNY (¥) | Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
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 |  | $ (2,395) | $ (47) |  |  |  |  |  |  |  |  |
First China 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 |  |  | 912 | $ 572 |  |  | $ 1,484 |  |  |  |  |
Value of Net Investment Hedging Instruments Used | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 160,000 |
Second China 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 |  | $ 453 | (73) |  |  | $ 380 |  |  |  |  |  |
Value of Net Investment Hedging Instruments Used | ¥ |  |  |  |  |  |  |  |  |  | ¥ 160,000 |  |
Derivatives in Cash Flow Hedging Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI |  |  |  |  | 7 years |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
Interest Expense [Member] | Derivatives in Cash Flow Hedging Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative | $ 507 |  |  |  |  |  |  |  |  |  |  |
Total Accumulated Other Comprehensive (Loss) Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized gains (loss) |  |  | $ 290 |  |  |  | $ 290 |  | $ 218 |  |  |
2008 Note Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance Date |  | Oct. 01, 2008 |  |  |  |  |  |  |  |  |  |
2009 Note Purchase Agreement [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 |  |  |
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 |  |  |  |  |  |  |  |  |  |
Face Amount | € |  |  |  |  |  |  |  | € 160,000 |  |  |  |
Series M Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of Net Investment Hedging Instruments Used | € |  |  |  |  |  |  |  | 40,000 |  |  |  |
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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