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Financial risk management (Schedule of Contractual Maturities of Financial Liabilities) (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Trade and other payables $ 10,410
Per-payment facilities 12,230
Interest on pre-payment facility 1,019
Operating leases 1,179
Other long-term liabilities 735
Total contractual maturities of financial liabilities on an undiscounted basis 25,573
Less than 1 year [Member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Trade and other payables 10,410
Per-payment facilities 5,355
Interest on pre-payment facility 694
Operating leases 274
Other long-term liabilities
Total contractual maturities of financial liabilities on an undiscounted basis 16,733
2 - 3 Years [Member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Trade and other payables
Per-payment facilities 6,875
Interest on pre-payment facility 325
Operating leases 535
Other long-term liabilities 245
Total contractual maturities of financial liabilities on an undiscounted basis 7,980
4 - 5 Years [Member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Trade and other payables
Per-payment facilities
Interest on pre-payment facility
Operating leases 370
Other long-term liabilities
Total contractual maturities of financial liabilities on an undiscounted basis 370
Over 5 Years [Member]  
Disclosure of maturity analysis for non-derivative financial liabilities [line items]  
Trade and other payables
Per-payment facilities
Interest on pre-payment facility
Operating leases
Other long-term liabilities 490
Total contractual maturities of financial liabilities on an undiscounted basis $ 490