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Accumulated Other Comprehensive Loss (Change In Accumulated Other Comprehensive (Loss) Income Per Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance [1] $ (184,436)    
Movement in foreign currency translation reserve related to equity accounted investment 5,430 $ (227)  
Movement in foreign currency translation reserve (10,522)    
Ending Balance (189,528)   $ (184,436) [1]
Accumulated Foreign Currency Translation Reserve [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (184,436)    
Movement in foreign currency translation reserve related to equity accounted investment 5,430    
Movement in foreign currency translation reserve (10,522)    
Ending Balance (189,528)   (184,436)
Accumulated Net Unrealized Income On Asset Available For Sale, Net Of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance    
Movement in foreign currency translation reserve related to equity accounted investment    
Movement in foreign currency translation reserve    
Ending Balance  
As Reported [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (159,237)    
Unrealized income on asset available for sale, net of tax     25,199
Ending Balance     (159,237)
As Reported [Member] | Accumulated Foreign Currency Translation Reserve [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (184,436)    
Ending Balance     (184,436)
As Reported [Member] | Accumulated Net Unrealized Income On Asset Available For Sale, Net Of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 25,199    
Ending Balance     25,199
Correction [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (25,199)    
Correction of error (Note 1)     (25,199)
Unrealized income on asset available for sale, net of tax     (25,199)
Ending Balance     (25,199)
Correction [Member] | Accumulated Foreign Currency Translation Reserve [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Correction of error (Note 1)    
Correction [Member] | Accumulated Net Unrealized Income On Asset Available For Sale, Net Of Tax [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Correction of error (Note 1)     (25,199)
As Restated [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ (184,436)    
Ending Balance     $ (184,436)
[1] Certain amounts shown here do not correspond to the Company's 2018 financial statements and reflects an adjustment made, refer to Note 1 See Notes to Unaudited Condensed Consolidated Financial Statements