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Income Taxes (Narrative) (Details)
R in Millions, $ in Millions
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2018
ZAR (R)
Sep. 30, 2018
USD ($)
Valuation Allowance [Line Items]        
Accrued interest related to uncertain tax positions $ 0.1      
Unrecognized tax benefit $ 1.0 $ 0.8    
CPS [Member]        
Valuation Allowance [Line Items]        
Valuation allowance related to net operating losses     R 223.4 $ 15.1