Document and Entity Information - USD ($)
12 Months Ended
Mar. 31, 2017
Apr. 14, 2017
Sep. 30, 2016
Document and Entity Information [Abstract]      
Entity Registrant Name BLACK BOX CORP    
Entity Central Index Key 0000849547    
Document Type 10-K    
Document Period End Date Mar. 31, 2017    
Amendment Flag false    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
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   14,964,758  
Entity Public Float     $ 212,776,808