Fair Value Measurements - Recurring Basis (Details) - USD ($)	Jun. 30, 2014	Nov. 05, 2013	Jul. 31, 2016
Jet Prep Ltd.
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent consideration		$ 2,490,000	$ 0
Assumed contingent obligation			1,138,000
Contingent consideration period		7 years
Cantel Medical (UK) - PuriCore International Limited
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent guaranteed obligation	$ 1,414,000		441,000
Level 3 | Recurring basis | Jet Prep Ltd.
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent consideration		$ 2,490,000	0
Assumed contingent obligation		$ 1,720,000	1,138,000
Contingent consideration period		7 years
Level 3 | Recurring basis | Jet Prep Ltd. | Minimum
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Assumed contingent obligation		$ 810,000
Level 3 | Recurring basis | Jet Prep Ltd. | Contingent Consideration
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Discount rate of cash flow projections (as a percent)		12.60%
Total potential contingent consideration payments, low end of range			0
Level 3 | Recurring basis | Jet Prep Ltd. | Assumed contingent liability
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Discount rate of cash flow projections (as a percent)		2.50%
Total potential contingent consideration payments, low end of range			0
Level 3 | Recurring basis | Cantel Medical (UK) - PuriCore International Limited
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent guaranteed obligation	$ 1,414,000		$ 441,000
Discount rate of cash flow projections (as a percent)	10.10%