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Derivative Instruments and Hedging Activities (Narrative) (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 23, 2016 EUR (€) | May 31, 2020 USD ($) | Jun. 30, 2020 USD ($) Swap loan | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) Swap loan | Jun. 30, 2019 USD ($) | Jun. 30, 2020 EUR (€) Swap loan | Sep. 30, 2019 USD ($) | May 31, 2018 USD ($) loan
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  |  | $ 22,649 | $ (6,890) | $ 18,255 | $ 11,831 |  |  |
Remaining unrecognzied gains (losses) associated with derivative instruments included in AOCI |  |  | (15,230) |  | $ (15,230) |  |  | $ (5,004) |
2016 Note Purchase Agreements [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Issuance date | Sep. 23, 2016 |  |  |  | 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 |  |  | 792 | 598 | $ 1,187 | 976 |  |  |
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 |  |  | (2,254) | (1,664) | (3,291) | 3,471 |  |  |
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 | 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 |  |  |  |  |  |  |
Floating-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 108,823 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
Fixed-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount |  | 400,000 |  |  |  |  |  |  |
2020 Fixed-Rate Cross-Currency Swaps [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 400,000 |  | $ 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 |  | 5 |  |
2020 Floating-Rate Cross-Currency Swap [Member] |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  | $ 45,000 |  | $ 45,000 |  |  |  |
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Selling, General and Administrative Expense [Member] | Cash Flow Hedging |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  |  | $ 24,885 | $ (5,244) | $ 21,492 | $ 8,306 |  |  |
Fixed-Rate Cross Currency Interest Rate Contract [Member] | Designated as Hedging Instrument | Cash Flow Hedging |  |  |  |  |  |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  |  | $ 400,000
Derivative, number of instruments | loan |  |  | 5 |  | 5 |  | 5 |  | 5
Amount of (Gain) Loss Reclassified from Accumulated OCI into Earnings |  | $ (32,200) |  |  |  |  |  |  |

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