Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Narrative (Details)

v3.7.0.1
Basis of Presentation - Narrative (Details)
a in Thousands
9 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
a
classification
segment
Jun. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Property, Plant and Equipment [Line Items]      
Number of business segments | segment 3    
Ownership interest (as a percent) 51.00% 51.00%  
Decrease in working capital | $     $ 1,184,000
Citree      
Property, Plant and Equipment [Line Items]      
Net income (loss) attributable to noncontrolling interest | $ $ 72,585 $ (59,568)  
Land      
Property, Plant and Equipment [Line Items]      
Area of land owned (in acres) | a 122    
Number of primary classifications | classification 2    
Mineral Rights      
Property, Plant and Equipment [Line Items]      
Area of land owned (in acres) | a 90