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Derivative Instruments and Hedging Activities (Narrative) (Details) € in Thousands, ¥ in Thousands, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 18, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2013 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 CNY (¥) | Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivative |  | $ (23,658) |  |  |  | $ (23,658) |  |  |  |  |  |
Unrealized Gain (Loss) on Derivatives Arising During Period |  | (23,658) |  |  |  | $ (23,658) |  |  |  |  |  |
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI |  |  |  |  |  | 12 months |  |  |  |  |  |
Face Amount | € |  |  |  |  |  |  |  | € 160,000 |  |  |  |
Derivative, Currency Bought | Euro |  |  |  |  |  |  |  |  |  |  |
Derivative, Cost of Hedge |  | 5,543 |  |  |  | $ 5,543 |  |  |  |  |  |
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 |  |  |  | $ 283 |  |  |  |  |  |  |  |
Second China Intercompany Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Value of Net Investment Hedging Instruments Used | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 160,000 |
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | 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 |  | $ (2,559) | $ (880) |  |  | (548) | $ 3,030 |  |  |  |  |
Designated as Hedging Instrument [Member] | Net Investment Hedging [Member] | 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 |  |  | $ 283 |  |  |  | $ 452 |  |  |  |  |
Total Accumulated Other Comprehensive (Loss) Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI |  |  |  |  |  |  |  |  | $ (18,521) | $ 218 |  |
Floating-Rate Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 167,420 |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 167,420 |  |  |
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 400,000 |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 400,000 |  |  |
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 400,000 |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 400,000 |  |  |
Foreign Exchange Option [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | € | € 490,000 |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | € | € 490,000 |  |  |  |  |  |  |  |  |  |  |
Derivative, Forward Exchange Rate | 1.2432 |  |  |  |  |  |  |  |  |  |  |
Derivative, Cost of Hedge |  |  |  |  |  | $ 5,543 |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  |  | Apr. 18, 2018 |  |  |  |  |  |
Derivative, Maturity Date |  |  |  |  |  | Jun. 01, 2018 |  |  |  |  |  |
Derivative, Exercise Date |  |  |  |  |  | May 30, 2018 |  |  |  |  |  |
Treasury Lock [Member] | Designated as Hedging Instrument [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 |  |  |  |  |  |  |
Net unrecognized gains on terminated derivative instruments expected to be reclassified to earnings |  |  |  |  |  | $ 72 |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
Derivative, Notional Amount |  |  |  |  |  |  |  |  |  |  |  | $ 25,000
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 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
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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