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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 27, 2025
Feb. 06, 2026
Jun. 28, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 27, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Registrant Name Fortune Brands Innovations, Inc.    
Entity Central Index Key 0001519751    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Document Financial Statement Error Correction [Flag] false    
Current Fiscal Year End Date --12-27    
Entity Filer Category Large Accelerated Filer    
Entity Well-known Seasoned Issuer Yes    
Entity Public Float     $ 6,137,574,374
Entity Common Stock, Shares Outstanding   119,988,377  
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol FBIN    
Security Exchange Name NYSE    
Entity File Number 1-35166    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 62-1411546    
Entity Address, Address Line One 1 Horizon Way, Building N    
Entity Address, City or Town Deerfield    
Entity Address, State or Province IL    
Entity Address, Postal Zip Code 60015-3888    
City Area Code 847    
Local Phone Number 484-4400    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference Certain information contained in the registrant’s proxy statement for its Annual Meeting of Stockholders to be held on May 5, 2026 (to be filed not later than 120 days after the end of the registrant’s fiscal year) (the “2026 Proxy Statement”) is incorporated by reference into Part III hereof.    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Chicago, Illinois    
Auditor Opinion [Text Block]

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Fortune Brands Innovations, Inc. and its subsidiaries (the "Company") as of December 27, 2025 and December 28, 2024, and the related consolidated statements of income, of comprehensive income, of equity and of cash flows for each of the three years in the period ended December 27, 2025, including the related notes and schedule of valuation and qualifying accounts for each of the three years in the period ended December 27, 2025 appearing after Item 16 and the signatures (collectively referred to as the "consolidated financial statements"). We also have audited the Company's internal control over financial reporting as of December 27, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 27, 2025 and December 28, 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 27, 2025 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 27, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.