Document and Entity Information (USD $)	3 Months Ended
	Jul. 02, 2011	Aug. 05, 2011	Oct. 01, 2010
Document and Entity Information
Entity Registrant Name	BLACK BOX CORP
Entity Central Index Key	0000849547
Document Type	10-Q
Document Period End Date	Jul. 02, 2011
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Well Known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		18,041,526
Entity Public Float			$ 564,375,550