Document and Entity Information - shares	9 Months Ended
	May 31, 2020	Jul. 09, 2020
Cover [Abstract]
Entity Registrant Name	SIMULATIONS PLUS INC
Entity Central Index Key	0001023459
Document Type	10-Q
Document Period End Date	May 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--08-31
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Shell Company	false
Entity Interactive data	Yes
Incorporation state	CA
Entity file number	001-32046
Entity Common Stock, Shares Outstanding		17,809,017
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2020