Document and Entity Information - shares
 6 Months Ended
Jan. 31, 2016
Feb. 29, 2016
Document and Entity Information    
Entity Registrant Name CANTEL MEDICAL CORP  
Entity Central Index Key 0000019446  
Document Type 10-Q  
Document Period End Date Jan. 31, 2016  
Amendment Flag false  
Current Fiscal Year End Date --07-31  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   41,700,815
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q2