| Cover | Oct. 01, 2019 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Amendment Description | As previously reported on its Current Report on Form 8-K filed with the Securities and Exchange Commission (the "SEC") on October 2, 2019 (the "Original Report"), Cantel Medical Corp. (the "Company"), completed its previously announced acquisition of Hu-Friedy Mfg. Co., LLC ("Hu-Friedy") from Dental Holding, LLC ("Dental Holding"), pursuant to that certain Purchase and Sale Agreement, dated as of July 29, 2019, by and among the Company, Hu-Friedy, Dental Holding, and, for limited purposes set forth therein, Ken Serota and Ron Saslow (the "Hu-Friedy Acquisition"). For a description of the Hu-Friedy Acquisition and the related agreements, see the Company’s Current Report on Form 8-K filed with the SEC on July 30, 2019. This Current Report on Form 8-K/A is being filed by the Company solely for the purpose of amending and supplementing the Original Report to provide the financial statements and pro forma financial information relating to the Hu-Friedy Acquisition required by Items 9.01(a) and (b) of Form 8-K, respectively. |
| Document Period End Date | Oct. 1, 2019 |
| Entity File Number | 001-31337 |
| Entity Registrant Name | CANTEL MEDICAL CORP |
| Entity Central Index Key | 0000019446 |
| Entity Tax Identification Number | 22-1760285 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 150 Clove Road |
| Entity Address, City or Town | Little Falls |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 07424 |
| City Area Code | 973 |
| Local Phone Number | 890-7220 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | CMD |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
