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Cover Page - USD ($)
 12 Months Ended
Aug. 31, 2025
Feb. 28, 2025
Cover [Abstract]    
Document Type 10-K  
Amendment Flag false  
Document Period End Date Aug. 31, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus FY  
Entity Registrant Name THE GREENBRIER COMPANIES, INC.  
Trading Symbol GBX  
Security Exchange Name NYSE  
Entity Central Index Key 0000923120  
Current Fiscal Year End Date --08-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Filer Category Large Accelerated Filer  
Title of 12(b) Security Common Stock  
Entity Public Float   $ 1,735,793,000
Document Annual Report true  
Document Transition Report false  
Entity File Number 1-13146  
Entity Emerging Growth Company false  
Entity Small Business false  
ICFR Auditor Attestation Flag true  
Entity Shell Company false  
Entity Incorporation, State or Country Code OR  
Entity Tax Identification Number 93-0816972  
Entity Address, Address Line One One Centerpointe Drive  
Entity Address, Address Line Two Suite 200  
Entity Address, City or Town Lake Oswego  
Entity Address, State or Province OR  
Entity Address, Postal Zip Code 97035  
City Area Code 503  
Local Phone Number 684-7000  
Documents Incorporated by Reference

Certain portions of the registrant’s definitive Proxy Statement prepared in connection with the Annual Meeting of Shareholders to be held on January 7, 2026 are incorporated by reference into Part III of this Report.

  
Auditor Firm ID 185  
Auditor Name KPMG LLP  
Auditor Location Portland, OR  
Document Financial Statement Error Correction [Flag] false  
Auditor Opinion

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of The Greenbrier Companies, Inc. and subsidiaries (the Company) as of August 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, equity, and cash flows for each of the years in the three-year period ended August 31, 2025, and the related notes (collectively, the consolidated financial statements). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of August 31, 2025 and 2024, and the results of its operations and its cash flows for each of the years in the three-year period ended August 31, 2025, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of August 31, 2025, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission, and our report dated October 28, 2025 expressed an unqualified opinion on the effectiveness of the Company’s internal control over financial reporting.