Document and Entity Information - USD ($)	12 Months Ended
	Aug. 31, 2018	Nov. 14, 2018	Feb. 28, 2018
Document And Entity Information
Entity Registrant Name	SIMULATIONS PLUS INC
Entity Central Index Key	0001023459
Document Type	10-K
Document Period End Date	Aug. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--08-31
Is Entity a Well-known Seasoned Issuer?	No
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 181,050,050
Entity Common Stock, Shares Outstanding		17,420,197
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2018