Document and Entity Information - shares	3 Months Ended
	Jun. 30, 2018	Jul. 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	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--03-30
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		24,596,265
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019