Document and Entity Information - shares	6 Months Ended
	Oct. 01, 2016	Oct. 14, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	BLACK BOX CORP
Entity Central Index Key	0000849547
Document Type	10-Q
Document Period End Date	Oct. 01, 2016
Amendment Flag	false
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
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		15,148,403