Subsequent Events (Details)			1 Months Ended	9 Months Ended
	Jul. 24, 2018 $ / shares	Jul. 13, 2018 USD ($) service_center_store company-owned_and_franchised_locations	Jul. 31, 2018 USD ($) shares	Jun. 30, 2018 USD ($) service_center_store $ / shares shares	Jun. 30, 2017 USD ($) service_center_store	Aug. 02, 2018 USD ($)	Jan. 31, 2018 USD ($)
Subsequent Event [Line Items]
Number of service center stores acquired | service_center_store				63	42
Consideration for acquisition				$ 71,000,000	$ 70,000,000
Dividend per share (usd per share) | $ / shares				$ 0.2235
Repurchase of common stock (shares) | shares				10,000,000
Repurchase of common stock				$ 224,000,000
Authorized shares for repurchase (up to)							$ 300,000,000
Subsequent Event
Subsequent Event [Line Items]
Dividend per share (usd per share) | $ / shares	$ 0.0745
Repurchase of common stock (shares) | shares			2,000,000
Repurchase of common stock			$ 42,000,000
Remaining authorized repurchase amount			134,000,000
Great Canadian Oil Change | Subsequent Event
Subsequent Event [Line Items]
Number of service center stores acquired | service_center_store		73
Consideration for acquisition		$ 53,000,000
Total number of company-owned and franchised locations after acquisition (more than) | company-owned_and_franchised_locations		1,200
Letter of Credit | Subsequent Event
Subsequent Event [Line Items]
Letters of credit outstanding						$ 11,000,000
Line of Credit | Revolver | Subsequent Event
Subsequent Event [Line Items]
Borrowings under the Revolver			$ 86,000,000
Remaining borrowing capacity under the Revolover						$ 309,000,000