Document and Entity Information - shares	3 Months Ended
	Jul. 01, 2017	Jul. 27, 2017
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	Jul. 01, 2017
Amendment Flag	false
Current Fiscal Year End Date	--03-31
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		24,248,269
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018