Cover - shares	6 Months Ended
	Feb. 28, 2021	Apr. 12, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Feb. 28, 2021
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Current Fiscal Year End Date	--08-31
Entity File Number	001-32046
Entity Registrant Name	Simulations Plus, Inc.
Entity Central Index Key	0001023459
Entity Tax Identification Number	95-4595609
Entity Incorporation, State or Country Code	CA
Entity Address, Address Line One	42505 10th Street West
Entity Address, City or Town	Lancaster
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	93534-7059
City Area Code	661
Local Phone Number	723-7723
Title of 12(b) Security	Common Stock, par value
Trading Symbol	SLP
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,107,895