You might be right about the AUD having no effect on their debt...

You might be right about the AUD having no effect on their debt but a stronger US dollar does affect revenue's as reported last quarterly

"Revenues for the first quarter ended 31 March 2016 were down 24% from the corresponding period in 2015, primarily driven by lower volume and unfavourable currency movements due to the stronger US dollar. Absent currency movements, revenues would have been down 19%."