Document and Entity Information - USD ($)	9 Months Ended
	Dec. 26, 2015	Jan. 08, 2016	Sep. 25, 2015
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. 26, 2015
Amendment Flag	false
Document Fiscal Year Focus	2016
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		15,382,475
Entity Public Float			$ 219,945,388