| Document and Entity Information | Jun. 02, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0000019446 |
| Current Fiscal Year End Date | --07-31 |
| Document Type | 8-K |
| Document Period End Date | Jun. 2, 2021 |
| Entity Registrant Name | CANTEL MEDICAL LLC |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-31337 |
| Entity Tax Identification Number | 22-1760285 |
| 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 | (937) |
| Local Phone Number | 890-7220 |
| Entity Information, Former Legal or Registered Name | CANTEL MEDICAL CORP. |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock |
| Trading Symbol | CMD |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
