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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Reconciliation of total capital expenditures incurred to total capital expenditures in the consolidated statements of cash flows    
Capital expenditures incurred $ 191,804 $ 169,166
Additions incurred prior year but paid for in current period 9,465 25,344
Additions incurred but not paid for as of the end of the period (25,966) (14,029)
Capital expenditures per Consolidated Condensed Statements of Cash Flows $ 175,303 $ 180,481