Fair Value Measurements (Details 3) - USD ($)	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Reconciliation of liability measured and recorded at fair value on a recurring basis using Level 3
Beginning balance	$ 5,869,000	$ 45,000	$ 2,537,000
Total net unrealized (gains) losses included in general and administrative expense in earnings	(2,585,000)	219,000	(2,492,000)
Net purchases, issuances, sales and settlements	(507,000)	5,605,000
Ending balance	2,777,000	5,869,000	45,000
Byrne Medical Business | Price floor
Reconciliation of liability measured and recorded at fair value on a recurring basis using Level 3
Beginning balance		45,000	1,037,000
Total net unrealized (gains) losses included in general and administrative expense in earnings		(45,000)	(992,000)
Ending balance			45,000
Contingent Consideration | Byrne Medical Business
Reconciliation of liability measured and recorded at fair value on a recurring basis using Level 3
Beginning balance			1,500,000
Total net unrealized (gains) losses included in general and administrative expense in earnings			$ (1,500,000)
Contingent Consideration | Jet Prep Ltd.
Reconciliation of liability measured and recorded at fair value on a recurring basis using Level 3
Beginning balance	2,722,000
Total net unrealized (gains) losses included in general and administrative expense in earnings	(1,971,000)	232,000
Net purchases, issuances, sales and settlements		2,490,000
Ending balance	751,000	2,722,000
Assumed contingent liability | Jet Prep Ltd.
Reconciliation of liability measured and recorded at fair value on a recurring basis using Level 3
Beginning balance	1,752,000
Total net unrealized (gains) losses included in general and administrative expense in earnings	(614,000)	32,000
Net purchases, issuances, sales and settlements		1,720,000
Ending balance	1,138,000	1,752,000
Contingent guaranteed obligation | Puri Core International Limited
Reconciliation of liability measured and recorded at fair value on a recurring basis using Level 3
Beginning balance	1,395,000
Net purchases, issuances, sales and settlements	(507,000)	1,395,000
Ending balance	$ 888,000	$ 1,395,000