Fair Value Measurements - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended
	Feb. 13, 2020	Jun. 30, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Feb. 12, 2020	Oct. 01, 2019	Jul. 31, 2018	Mar. 21, 2018	Oct. 31, 2017	Jul. 31, 2017
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Assumed contingent obligation										$ 0
Convertible debt
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Fair value, convertible debt			$ 224,330,000
Hu-Friedy
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent consideration			0				$ 38,371,000
Payment for contingent consideration liability				$ 35,000	$ 25,000
Decrease in contingent consideration liability			17,210,000
Contingent consideration, high end of range			$ 35,000
Hu-Friedy | Dental Holdings
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent consideration, high end of range	$ 35,000
Repurchase of shares (in dollars per share)						$ 64.51
Shares repurchased (in shares)	438,359
Payment to settle portion of contingent consideration	$ 6,721,000
Consideration for the repurchase	$ 28,279,000
Aexis Medical
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Contingent consideration									$ 1,292,000
Payment for contingent consideration liability		$ 1,691,000
Contingent consideration, high end of range								$ 1,850,000
Contingent consideration, low end of range								$ 0
Jet Prep Ltd.
Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis
Assumed contingent obligation											$ 1,138,000