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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 30, 2018 USD ($) | Apr. 18, 2018 USD ($) | Jul. 31, 2017 USD ($) | Aug. 31, 2013 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 01, 2018 EUR (€) | May 31, 2018 USD ($) loan | Sep. 23, 2016 EUR (€) | Jul. 31, 2016 USD ($) | Jun. 30, 2013 USD ($)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain recognized in accumulated OCI on derivative |  |  |  |  | $ 47,759 | $ (23,000) |  |  |  |  |  |
Term of gain or loss recognition in interest expense on terminated derivatives recorded in OCI |  |  |  |  | 12 months |  |  |  |  |  |  |
Derivative, cost of hedge |  |  |  |  |  | 5,543 |  |  |  |  |  |
First China Intercompany Loan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 380 |  |  |  | $ 453 |  |  |  |  |
Total Accumulated Other Comprehensive (Loss) Earnings [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI |  |  |  |  | $ 5,004 | (21,315) |  |  |  |  |  |
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, number of instruments | loan |  |  |  |  |  |  |  |  | 5 |  |  |
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 |  |  |
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 |  |  |
Treasury Lock [Member] | Designated as Hedging Instrument [Member] | Derivatives in Cash Flow Hedging Relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Amount of gain 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
Foreign Exchange Option [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | € |  |  |  |  |  |  |  | € 490,000,000 |  |  |  |
Derivative, exchange rate | 1.2432 |  |  |  |  |  |  | 1.2432 |  |  |  |
Derivative, currency bought |  |  |  |  | Euro |  |  |  |  |  |  |
Derivative, cost of hedge | $ 5,543 | $ 5,543 |  |  |  |  |  |  |  |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance date |  |  |  |  | Sep. 23, 2016 |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | € 160,000,000 |  |
Series O Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | 43,000,000 |  |
Series N Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | 77,000,000 |  |
Series M Notes [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 |  |  |  |  | $ 2,682 | $ 838 | $ (2,395) |  |  |  |  |
Face amount | € |  |  |  |  |  |  |  |  |  | € 40,000,000 |  |

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