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Property, Plant and Equipment (Narrative) (Details)
$ in Thousands, ₩ in Billions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2016
Oct. 31, 2016
USD ($)
Oct. 31, 2016
KRW (₩)
Jun. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]                  
Depreciation         $ 140,728 $ 122,812 $ 414,687 $ 370,663  
Property, Plant and Equipment, Gross         6,404,999   6,404,999   $ 6,072,394
Proceeds from Sale of Property, Plant, and Equipment             13,687 $ 5,212  
Construction in Progress [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, Plant and Equipment, Gross         404,507   404,507   352,607
Construction in Progress [Member] | K5 Facility [Member] | KOREA, REPUBLIC OF                  
Property, Plant and Equipment [Line Items]                  
Property, Plant and Equipment, Gross         365,800   365,800   312,100
Accumulated Capitalized Interest Costs         $ 23,000   $ 23,000   $ 18,700
Subsequent Event [Member] | KOREA, REPUBLIC OF                  
Property, Plant and Equipment [Line Items]                  
Proceeds from Sale of Property, Plant, and Equipment   $ 142,000 ₩ 162.1            
Percentage of Proceeds Received 10.00%                
Gain (Loss) on Disposition of Property Plant Equipment       $ 100,000