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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Reconciliation of total capital expenditures incurred to total capital expenditures in the consolidated statements of cash flows    
Capital expenditures incurred $ 190,965 $ 191,804
Additions incurred in prior year but paid for in current period 20,004 9,465
Additions incurred but not paid for as of the end of the period (19,767) (25,966)
Capital expenditures per Consolidated Condensed Statements of Cash Flows $ 191,202 $ 175,303