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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) | Aug. 31, 2013 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Swap loan | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2020 EUR (€) Swap loan | May 31, 2018 USD ($) loan | Sep. 23, 2016 EUR (€) | Jun. 30, 2013 USD ($)
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 41,250 |  |  |  |  |  |
Swap termination fee |  |  | $ 3,000 |  |  |  |  |  |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  |  |  | (2,134) | $ 31,446 | $ (1,467) |  |  |  |
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI |  |  |  | $ (21,132) | (5,004) |  |  |  |  |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance date |  |  |  | Sep. 23, 2016 |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  | € 160,000,000 |  | € 160,000,000 |
Series M Notes [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  |  | € 40,000,000 |  | € 40,000,000 |
Maturity date |  |  |  | Sep. 23, 2026 |  |  |  |  |  |
Gain (Loss) on foreign currency transaction designated as a hedge of a net investment in a foreign subsidiary |  |  |  | $ 3,199 | 2,682 | 838 |  |  |  |
Floating-Rate Cross Currency Interest Rate Contract [Member] | Selling, General and Administrative Expense [Member] | Derivatives in Fair Value Hedging Relationships [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  |  |  | (5,396) | 8,356 | (472) |  |  |  |
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 |  |
Floating-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Derivatives in Fair Value Hedging Relationships [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | $ 1,719 |  |  |  |  |  |  |  |  |
2020 Fixed-Rate Cross-Currency Swaps [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 400,000 |  |  |  |  |  |
2020 Fixed-Rate Cross-Currency Swaps [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | 400,000 |  |
Derivative, number of instruments | Swap |  |  |  | 5 |  |  | 5 |  |  |
Floating-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | 108,823 |  |  |  |  |  |  |  |  |
Fixed-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount | 400,000 |  |  |  |  |  |  |  |  |
Floating-Rate Cross-Currency Swap and Fixed-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from swap contracts settlement | 59,571 |  |  |  |  |  |  |  |  |
Derivative asset, fair value | 58,191 |  |  |  |  |  |  |  |  |
Proceed from net interest accrued on swap contracts settlement | 4,380 |  |  |  |  |  |  |  |  |
Floating-Rate Cross-Currency Swap and Fixed-Rate Cross-Currency Swap [Member] | Selling, General and Administrative Expense [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Swap termination fee | 3,000 |  |  |  |  |  |  |  |  |
2020 Floating-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  | $ 45,000 |  |  |  |  |  |
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Selling, General and Administrative Expense [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  |  |  | $ 3,190 | $ 23,018 | $ (1,067) |  |  |  |
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | $ 400,000 |  |
Derivative, number of instruments | loan |  |  |  | 5 |  |  | 5 | 5 |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings | $ 32,200 |  |  |  |  |  |  |  |  |
Treasury Lock [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  |  | $ 25,000
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  | $ 507 |  |  |  |  |  |  |  |

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