Document and Entity Information - shares	6 Months Ended
	Sep. 29, 2018	Oct. 26, 2018
Document And Entity Information
Entity Registrant Name	RBC Bearings INC
Entity Central Index Key	0001324948
Document Type	10-Q
Trading Symbol	ROLL
Document Period End Date	Sep. 29, 2018
Amendment Flag	false
Current Fiscal Year End Date	--03-30
Entity's Reporting Status Current	Yes
Entity Small Business	false
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		24,768,522
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2019