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Business Description	12 Months Ended
Business Description	Jul. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description	Business Description Throughout this document, references to “Cantel,” “us,” “we,” “our,” and the “Company” are references to Cantel Medical Corp. and its subsidiaries, except where the context makes it clear the reference is to Cantel itself and not its subsidiaries. Unless otherwise indicated, references in this Form 10-K to 2018, 2017, 2016 or “fiscal” 2018, 2017, 2016 or other years refer to our fiscal year ended July 31 of that respective year, and references to 2019 or “fiscal” 2019 refer to our fiscal year ending July 31, 2019. Cantel is a leading provider of infection prevention and control products and services in the healthcare market, specializing in the following reportable segments: Endoscopy: designs, develops, manufactures, sells and installs a comprehensive offering of products and services comprising a complete circle of infection prevention solutions. Our products include endoscope reprocessing and endoscopy procedure products. Water Purification and Filtration: designs, develops, manufactures, sells and installs water purification systems for medical, pharmaceutical and other bacteria controlled applications. We also provide filtration/separation and disinfectant technologies to the medical and life science markets through a worldwide distributor network. Healthcare Disposables: designs, manufactures, sells, supplies and distributes a broad selection of infection prevention healthcare products, the majority of which are single-use products used by dental practitioners. Dialysis: designs, develops, manufactures, sells and services reprocessing systems and sterilants for dialyzers (a device serving as an artificial kidney), as well as dialysate concentrates and supplies utilized for renal dialysis. See Note 16, "Reportable Segments." Most of our equipment, consumables and supplies are used to help prevent the occurrence or spread of infections.