Annual report pursuant to Section 13 and 15(d)

Goodwill and intangible assets (Details)

v2.4.0.8
Goodwill and intangible assets (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2014
May 31, 2013
Jul. 31, 2012
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2014
Clinical Labs [Member]
Jul. 31, 2013
Clinical Labs [Member]
Jul. 31, 2012
Enzo Life Sciences [Member]
May 31, 2012
Trademarks [Member]
Jul. 31, 2012
Trademarks [Member]
Jul. 31, 2014
Trademarks [Member]
Jul. 31, 2014
Intangible Assets, Amortization Period [Member]
Goodwill and intangible assets (Details) [Line Items]                          
Goodwill       $ 7,452,000 $ 7,452,000   $ 7,452,000 $ 7,452,000          
Percentage Of Stock Price Result Of Decline Market Capitalization     44.00%                    
Asset Impairment Charges           24,540,000     18,800,000   5,700,000    
Asset Impairment Charges Net of Taxes           22,400,000     18,000,000   4,400,000    
Finite-Lived Intangible Asset, Useful Life       10 years           5 years   5 years 5 years
Amortization of Intangible Assets       1,840,000 1,990,000 1,660,000           600,000  
Finite-Lived Intangible Assets, Period Increase (Decrease)                   5,700,000      
Goodwill, Impairment Loss $ 0 $ 0