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Supplemental Cash Flow Information - Supplemental Disclosure of Non-cash Activity (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Supplemental disclosure of non-cash activity:    
Non-cash land acquisitions $ 8,346 $ 8,265
Land acquisitions for debt 6,305 0
Supplemental disclosure of cash activity:    
Interest payments 60,847 95,316
Income tax payments 548 1,219
Tax refunds received $ 3 $ 198