Summary of Significant Accounting Policies (Policies)	9 Months Ended
May 31, 2025
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	Unaudited Interim Consolidated Financial Statements The unaudited interim consolidated financial statements include the accounts of Simply Good Foods and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. Unless the context otherwise requires, “we,” “us,” “our” and the “Company” refer to Simply Good Foods and its subsidiaries. In context, “Quest” may also refer to the Quest brand, “Atkins” may also refer to the Atkins brand, and “OWYN” may also refer to the OWYN brand. Atkins, Atkins Endulge, Quest, OWYN, and the Simply Good logo are either registered trademarks or trademarks of the Company’s wholly owned subsidiary Simply Good Foods USA, Inc. or one of its affiliates in the United States and elsewhere. All rights are reserved. The Company maintains its accounting records on a 52/53-week fiscal year, ending on the last Saturday in August of each year. The interim consolidated financial statements and related notes of the Company and its subsidiaries are unaudited. The unaudited interim consolidated financial statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (the “SEC”). The unaudited interim consolidated financial statements reflect all adjustments and disclosures which are, in the Company’s opinion, necessary for a fair presentation of the results of operations, financial position and cash flows for the indicated periods. All such adjustments were of a normal and recurring nature unless otherwise disclosed. The year-end balance sheet data was derived from the audited financial statements and, in accordance with the instructions to Form 10-Q, certain information and footnote disclosures required by GAAP have been condensed or omitted. The results reported in these unaudited interim consolidated financial statements are not necessarily indicative of the results that may be reported for the entire fiscal year and should be read in conjunction with the Company’s consolidated financial statements for the fiscal year ended August 31, 2024, included in the Company’s Annual Report on Form 10-K (“Annual Report”) filed with the SEC on October 29, 2024.
New Accounting Pronouncements, Policy [Policy Text Block]	Refer to Note 2, Summary of Significant Accounting Policies, to the consolidated financial statements included in the Annual Report for a description of significant accounting policies. Recently Issued and Adopted Accounting Pronouncements Recently Issued Accounting Pronouncements Not Yet Adopted In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”), which updates reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740), Improvements to Income Tax Disclosures (“ASU 2023-09”), which updates disclosures required in the footnotes to the financial statements to further aid investors in understanding how to analyze income tax reporting. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available. The amendments should be applied on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements. In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which will improve the disclosures about a public business entity’s expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions such as cost of sales, SG&A, and R&D. The amendments are effective for fiscal years beginning after December 15, 2026, and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted for annual financial statements that have not yet been issued or made available. The amendments should be applied on either (1) prospectively to financial statements issued for reporting periods after the effective date or (2) retrospectively to any or all prior periods presented in the financial statements. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements. No other new accounting pronouncement issued or effective during the fiscal year had or is expected to have a material effect on the Company’s consolidated financial statements.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

May 31, 2025

Basis of Accounting, Policy [Policy Text Block]

Unaudited Interim Consolidated Financial Statements

The unaudited interim consolidated financial statements include the accounts of Simply Good Foods and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated. Unless the context otherwise requires, “we,” “us,” “our” and the “Company” refer to Simply Good Foods and its subsidiaries. In context, “Quest” may also refer to the Quest brand, “Atkins” may also refer to the Atkins brand, and “OWYN” may also refer to the OWYN brand. Atkins, Atkins Endulge, Quest, OWYN, and the Simply Good logo are either registered trademarks or trademarks of the Company’s wholly owned subsidiary Simply Good Foods USA, Inc. or one of its affiliates in the United States and elsewhere. All rights are reserved.

The Company maintains its accounting records on a 52/53-week fiscal year, ending on the last Saturday in August of each year.

The interim consolidated financial statements and related notes of the Company and its subsidiaries are unaudited. The unaudited interim consolidated financial statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) and the rules and regulations of the Securities and Exchange Commission (the “SEC”). The unaudited interim consolidated financial statements reflect all adjustments and disclosures which are, in the Company’s opinion, necessary for a fair presentation of the results of operations, financial position and cash flows for the indicated periods. All such adjustments were of a normal and recurring nature unless otherwise disclosed. The year-end balance sheet data was derived from the audited financial statements and, in accordance with the instructions to Form 10-Q, certain information and footnote disclosures required by GAAP have been condensed or omitted. The results reported in these unaudited interim consolidated financial statements are not necessarily indicative of the results that may be reported for the entire fiscal year and should be read in conjunction with the Company’s consolidated financial statements for the fiscal year ended August 31, 2024, included in the Company’s Annual Report on Form 10-K (“Annual Report”) filed with the SEC on October 29, 2024.

New Accounting Pronouncements, Policy [Policy Text Block]

Refer to Note 2, Summary of Significant Accounting Policies, to the consolidated financial statements included in the Annual Report for a description of significant accounting policies.

Recently Issued and Adopted Accounting Pronouncements

Recently Issued Accounting Pronouncements Not Yet Adopted

In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures (“ASU 2023-07”), which updates reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. The amendments are effective for fiscal years beginning after December 15, 2023, and for interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments should be applied retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740), Improvements to Income Tax Disclosures (“ASU 2023-09”), which updates disclosures required in the footnotes to the financial statements to further aid investors in understanding how to analyze income tax reporting. The amendments are effective for fiscal years beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available. The amendments should be applied on a prospective basis; however, retrospective application is permitted. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (“ASU 2024-03”), which will improve the disclosures about a public business entity’s expenses and address requests from investors for more detailed information about the types of expenses in commonly presented expense captions such as cost of sales, SG&A, and R&D. The amendments are effective for fiscal years beginning after December 15, 2026, and for interim periods within fiscal years beginning after December 15, 2027. Early adoption is permitted for annual financial statements that have not yet been issued or made available. The amendments should be applied on either (1) prospectively to financial statements issued for reporting periods after the effective date or (2) retrospectively to any or all prior periods presented in the financial statements. The Company is currently evaluating the provisions of the amendments and the effect on its future consolidated financial statements.

No other new accounting pronouncement issued or effective during the fiscal year had or is expected to have a material effect on the Company’s consolidated financial statements.