Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Business Acquisition, Aggregate Number Of Service Center Stores

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Subsequent Events (Details) $ / shares in Units, $ in Millions		2 Months Ended	12 Months Ended
	Nov. 19, 2018 $ / shares	Nov. 19, 2018 USD ($) franchise_service_center_stores franchise_center_stores	Sep. 30, 2018 USD ($) franchise_service_center_stores $ / shares	Sep. 30, 2017 USD ($) franchise_service_center_stores $ / shares	Sep. 30, 2016 USD ($) franchise_service_center_stores $ / shares
Subsequent Event [Line Items]
Purchase price \| $			$ 125	$ 72	$ 79
Number of franchise service center stores acquired			73	14	42
Number of former franchise service center stores acquired			60		9
Dividend per common share (usd per share) \| $ / shares			$ 0.298	$ 0.196	$ 0
Subsequent Event
Subsequent Event [Line Items]
Dividend per common share (usd per share) \| $ / shares	$ 0.106
Subsequent Event \| Oil Changers, Inc.
Subsequent Event [Line Items]
Aggregate number of service center stores acquired		35
Purchase price \| $		$ 30
Number of franchise service center stores acquired		31
Number of former franchise service center stores acquired \| franchise_center_stores		4