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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 30, 2018
Document and Entity Information
Document type	10-Q
Amendment flag	false
Document period end date	Jun. 30, 2018
Document fiscal year focus	2018
Current fiscal year end date	--12-31
Document fiscal period focus	Q2
Entity registrant name	O REILLY AUTOMOTIVE INC
Entity central index key	0000898173
Entity filer category	Large Accelerated Filer
Entity common stock, shares outstanding		80,563,009

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