Reportable Segment Information - Sales by Product (Details) - Sales Revenue, Net - Product Concentration Risk	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Core North America
Revenue from External Customer [Line Items]
Concentration risk	100.00%	100.00%	100.00%
Quick Lubes
Revenue from External Customer [Line Items]
Concentration risk	100.00%	100.00%	100.00%
International
Revenue from External Customer [Line Items]
Concentration risk	100.00%	100.00%	100.00%
Lubricants | Core North America
Revenue from External Customer [Line Items]
Concentration risk	85.00%	86.00%	87.00%
Lubricants | Quick Lubes
Revenue from External Customer [Line Items]
Concentration risk	85.00%	84.00%	83.00%
Lubricants | International
Revenue from External Customer [Line Items]
Concentration risk	89.00%	89.00%	89.00%
Antifreeze | Core North America
Revenue from External Customer [Line Items]
Concentration risk	8.00%	7.00%	7.00%
Antifreeze | Quick Lubes
Revenue from External Customer [Line Items]
Concentration risk	1.00%	1.00%	1.00%
Antifreeze | International
Revenue from External Customer [Line Items]
Concentration risk	5.00%	6.00%	3.00%
Filters | Core North America
Revenue from External Customer [Line Items]
Concentration risk	3.00%	3.00%	2.00%
Filters | Quick Lubes
Revenue from External Customer [Line Items]
Concentration risk	8.00%	8.00%	8.00%
Filters | International
Revenue from External Customer [Line Items]
Concentration risk	3.00%	1.00%	1.00%
Chemicals and other | Core North America
Revenue from External Customer [Line Items]
Concentration risk	4.00%	4.00%	4.00%
Chemicals and other | Quick Lubes
Revenue from External Customer [Line Items]
Concentration risk	2.00%	2.00%	2.00%
Chemicals and other | International
Revenue from External Customer [Line Items]
Concentration risk	3.00%	4.00%	7.00%
Franchise | Core North America
Revenue from External Customer [Line Items]
Concentration risk	0.00%	0.00%	0.00%
Franchise | Quick Lubes
Revenue from External Customer [Line Items]
Concentration risk	4.00%	5.00%	6.00%
Franchise | International
Revenue from External Customer [Line Items]
Concentration risk	0.00%	0.00%	0.00%