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Borrowings (Westpac Bank Corporate Credit Facility (NZ)) (Narrative) (Details) $ in Thousands, $ in Millions |  |  |  |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2021 NZD ($) | May 07, 2021 NZD ($) | Dec. 20, 2018 NZD ($) | Dec. 19, 2018 NZD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jul. 27, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contractual facility |  |  |  |  | $ 269,953 |  | $ 300,449 |
Repayment of long-term borrowings |  |  |  |  | 79,357 | $ 28,910 |  |
Westpac Bank Corporate Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contractual facility | $ 13.8 | $ 16.0 |  |  | $ 9,548 |  | $ 23,021 |
Maturity date |  |  |  |  | Dec. 31, 2023 |  | Dec. 31, 2023 |
Interest rate |  |  | 1.10% |  |  |  |  | 1.65%
Repayment of long-term borrowings | $ 2.2 | $ 16.0 |  |  |  |  |  |
Westpac Bank Corporate Credit Facility [Member] | Bank Bill Swap Bid Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  | 2.40%
Westpac Bank Corporate Credit Facility, Tranche 1 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contractual facility |  |  | $ 32.0 | $ 35.0 |  |  |  |
Westpac Bank Corporate Credit Facility, Tranche 1 [Member] | Bank Bill Swap Bid Rate [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  | 1.75% |  |  |  |  |
Westpac Bank Corporate Credit Facility, Tranche 2 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Contractual facility |  |  | $ 18.0 |  |  |  |  |

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