Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Sep. 30, 2018
Citrus trees
Property, Plant and Equipment [Line Items]
Pre-productive maintenance costs capitalization period	4 years
Useful life	25 years
Equipment and other facilities | Minimum
Property, Plant and Equipment [Line Items]
Useful life	3 years
Equipment and other facilities | Maximum
Property, Plant and Equipment [Line Items]
Useful life	20 years
Buildings and improvements | Minimum
Property, Plant and Equipment [Line Items]
Useful life	25 years
Buildings and improvements | Maximum
Property, Plant and Equipment [Line Items]
Useful life	39 years