Document and Entity Information - USD ($)
12 Months Ended
Oct. 29, 2017
Dec. 15, 2017
Apr. 30, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name PHOTRONICS INC    
Entity Central Index Key 0000810136    
Current Fiscal Year End Date --10-29    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 777,531,974
Entity Common Stock, Shares Outstanding   69,052,587  
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Oct. 29, 2017