Commitments and Contingencies - Annual Required Payments (Details)
6 Months Ended
Jan. 31, 2016
USD ($)
Minimum commitments under noncancelable operating leases  
Remaining fiscal year $ 2,620,000
2017 4,438,000
2018 3,254,000
2019 2,463,000
2020 1,388,000
Thereafter 2,637,000
Total 16,800,000
Total contractual obligations  
Remaining fiscal year 6,602,000
2017 12,578,000
2018 7,004,000
2019 138,237,000
2020 1,984,000
Thereafter 3,485,000
Total 169,890,000
Jet Prep Ltd.  
Total contractual obligations  
Contingent consideration 143,000
Assumed contingent obligation 1,138,000
Compensation agreements  
Other commitments  
Remaining fiscal year 2,308,000
2017 4,821,000
2018 541,000
2019 206,000
2020 206,000
Thereafter 86,000
Total 8,168,000
Contingent consideration  
Other commitments  
2019 36,000
2020 132,000
Thereafter 40,000
Total 208,000
Contingent consideration | Jet Prep Ltd.  
Total contractual obligations  
Contingent consideration $ 143,000
Discount rate of potential payments (as a percent) 12.60%
Contingent consideration | Cantel Medical UK  
Total contractual obligations  
Assumed contingent obligation $ 637,000
Assumed contingent liability  
Other commitments  
Remaining fiscal year 1,000
2017 19,000
2018 93,000
2019 188,000
2020 246,000
Thereafter 719,000
Total $ 1,266,000
Assumed contingent liability | Jet Prep Ltd.  
Total contractual obligations  
Discount rate of potential payments (as a percent) 2.50%
Assumed contingent obligation $ 1,138,000
Contingent guaranteed obligation  
Other commitments  
Remaining fiscal year 176,000
2017 193,000
2018 144,000
2019 132,000
Total 645,000
Contingent guaranteed obligation | Cantel Medical UK  
Total contractual obligations  
Contingent consideration $ 637,000
Discount rate of potential payments (as a percent) 10.10%
Other long-term obligations  
Other commitments  
Remaining fiscal year $ 109,000
2017 330,000
2018 195,000
2019 92,000
2020 12,000
Thereafter 3,000
Total 741,000
Credit Agreement  
Maturity of the credit facility  
2019 133,500,000
Total 133,500,000
Expected interest payments under the credit facility  
Remaining fiscal year 1,388,000
2017 2,777,000
2018 2,777,000
2019 1,620,000
Total $ 8,562,000
Total contractual obligations  
Weighted average interest rate on outstanding borrowings (as a percent) 2.08%