Cover - shares	3 Months Ended	6 Months Ended
	Feb. 29, 2020	Feb. 29, 2020	Apr. 03, 2020
Document Information [Line Items]
Entity Central Index Key		0001702744
Document Type		10-Q
Document Quarterly Report		true
Entity Registrant Name		The Simply Good Foods Company
Document Period End Date		Feb. 29, 2020
Document Fiscal Period Focus		Q2
Entity File Number		001-38115
Entity Incorporation, State or Country Code		DE
Entity Tax Identification Number		82-1038121
Entity Address, Address Line One		1225 17th Street, Suite 1000
Entity Address, City or Town		Denver
Entity Address, State or Province		CO
Entity Address, Postal Zip Code		80202
City Area Code		303
Local Phone Number		633-2840
Title of 12(b) Security		Common Stock, par value $0.01 per share
Trading Symbol		SMPL
Security Exchange Name		NASDAQ
Entity Current Reporting Status		Yes
Entity Interactive Data Current		Yes
Entity Filer Category		Large Accelerated Filer
Entity Small Business		false
Entity Emerging Growth Company		false
Current Fiscal Year End Date		--08-29
Entity Shell Company	false	false
Entity Common Stock, Shares Outstanding			95,378,514
Document Transition Report		false
Amendment Flag		false
Document Fiscal Year Focus		2020