Fair Value Measurements (Details) (USD $)	1 Months Ended	12 Months Ended	0 Months Ended	1 Months Ended
	Feb. 29, 2012 item	Jul. 31, 2013	Aug. 02, 2011 Recurring basis Level 3 Byrne Medical Business	Nov. 30, 2013 Recurring basis Level 3 Byrne Medical Business	Jul. 29, 2011 Recurring basis Level 3 Byrne Medical Business
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Number of existing senior lenders of debt, whose variable interest cash flows will be exchanged by the entity with fixed interest cash flows	1
Initial contingent consideration liability			$ 2,700,000
Initial price floor			3,000,000
Price floor period			3 years
Discount rate of cash flow projections (as a percent)			14.00%
Contingent consideration period			2 years
Stock split ratio		1.5	1.5
Stock consideration (in shares)			902,528
Stock price (in dollars per share)			$ 11.08		$ 11.08
Estimated contingent consideration range, high end			$ 10,000,000	$ 6,666,666
Cantel common stock placed in escrow at the time of acquisition			902,528
Proportion of shares released from escrow				0.33
Proportion of estimated contingent consideration reduced as a result of shares released from escrow				0.33