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Borrowings (Australian NAB Corporate Term Loan (AU)) (Narrative) (Details) $ in Millions | Dec. 29, 2021 AUD ($) | Jun. 09, 2021 USD ($) | Mar. 15, 2019 AUD ($) | Aug. 06, 2021
--- | --- | --- | --- | ---
Revolving Corporate Markets Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | $ 43,000,000.0 |  | $ 66,500,000 |
Repayment of debt |  | $ 20.0 |  |
Interest rate |  |  |  | 1.75%
Revolving Corporate Markets Loan Facility, Amended [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 123,000,000.0 |  | $ 5,000,000.0 |
Interest rate |  |  | 1.90% |
Revolving Corporate Markets Loan Facility, Amended [Member] | Scenario, Actual [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 120,000,000.0 |  |  |
Corporate Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 120,000,000.0 |
Corporate Loan Facility [Member] | Revolving Credit Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 80,000,000.0 |
Corporate Loan Facility [Member] | Core Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | 40,000,000.0 |
Bank Guarantee Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  | $ 5,000,000.0 |
Interest rate |  |  | 1.85% |
Jindalee, Queensland [Member] | Revolving Corporate Markets Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Line of credit facility, maximum borrowing capacity | 3,000,000.0 |  |  |
Semi-Annual principal payment | $ 500,000 |  |  |
Minimum [Member] | Corporate Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable interest rate |  |  | 0.85% |
Maximum [Member] | Corporate Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable interest rate |  |  | 1.30% |
Bank Bill Swap Bid Rate [Member] | Revolving Corporate Markets Loan Facility [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Spread on variable interest rate |  |  | 0.95% |

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