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Commitments and Contingencies - Other Long-Term Obligations (Details) - USD ($)
Nov. 05, 2013
Apr. 30, 2016
Nov. 03, 2014
Jet Prep Ltd.      
Commitments and Contingencies      
Contingent consideration liability   $ 148,000  
Assumed contingent obligation   1,138,000  
Period over which potential cash contingent consideration is payable 7 years    
Cantel Medical (UK)      
Commitments and Contingencies      
Contingent guaranteed obligation   569,000  
International Medical Service S.r.l.      
Commitments and Contingencies      
Other long-term liabilities     $ 1,020,000
International Medical Service S.r.l. | Central bank of Italy      
Commitments and Contingencies      
Liabilities assumed   510,000 $ 843,000
Interest rate per annum (as a percent)     0.25%
International Medical Service S.r.l. | Central bank of Italy | Accrued expenses      
Commitments and Contingencies      
Liabilities assumed   169,000 $ 187,000
International Medical Service S.r.l. | Central bank of Italy | Other long-term liabilities      
Commitments and Contingencies      
Liabilities assumed   $ 341,000 $ 656,000