Document and Entity Information - shares	6 Months Ended
	Jan. 31, 2017	Feb. 28, 2017
Document and Entity Information
Entity Registrant Name	CANTEL MEDICAL CORP
Entity Central Index Key	0000019446
Document Type	10-Q/A
Document Period End Date	Jan. 31, 2017
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		41,724,077
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2