Document and Entity Information (USD $)	9 Months Ended
	Dec. 27, 2014	Jan. 09, 2015	Sep. 26, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	BLACK BOX CORP
Entity Central Index Key	0000849547
Document Type	10-Q
Document Period End Date	Dec. 27, 2014
Amendment Flag	false
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
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		15,363,200
Entity Public Float			$ 364,552,160