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Cover Page - USD ($)
$ in Billions
 12 Months Ended
Dec. 28, 2019
Feb. 17, 2020
Jun. 29, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 28, 2019    
Entity File Number 1-7283    
Entity Registrant Name Regal Beloit Corp    
Entity Incorporation, State or Country Code WI    
Entity Tax Identification Number 39-0875718    
Entity Address, Address Line One 200 State Street    
Entity Address, City or Town Beloit    
Entity Address, State or Province WI    
Entity Address, Postal Zip Code 53511    
City Area Code 608    
Local Phone Number 364-8800    
Title of 12(b) Security Common Stock ($0.01 Par Value)    
Trading Symbol RBC    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
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    
Entity Shell Company false    
Entity Public Float     $ 3.4
Entity Common Stock, Shares Outstanding   40,654,327  
Entity Central Index Key 0000082811    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-28    
Documents Incorporated by Reference
Certain information contained in the Proxy Statement for the Annual Meeting of Shareholders to be held on April 28, 2020 (the “2020 Proxy Statement”) is incorporated by reference into Part III hereof.