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Supplemental Statements of Cash Flows Information (Schedule of Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Supplemental Statements of Cash Flows Information    
Interest paid, net of amounts capitalized $ 14,878 $ 13,953
Income taxes paid 3,667 7,337
Income tax refunds received 913 71
Purchases of property, plant and equipment on account $ 26,666 $ 33,621