Enzo Biochem, Inc. Annual report pursuant to Section 13 and 15(d)

Segment reporting (Details) - Geographic financial information (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales to unaffiliated customers	$ 95,947	$ 93,707	$ 103,083
Long-lived assets at July 31,
Long-lived assets	23,290	26,012	28,348
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales to unaffiliated customers	84,389	80,559	87,776
Long-lived assets at July 31,
Long-lived assets	20,854	23,136	25,081
SWITZERLAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales to unaffiliated customers	4,130	5,499	6,802
Long-lived assets at July 31,
Long-lived assets	1,629	1,984	2,223
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales to unaffiliated customers	2,023	2,324	2,728
Long-lived assets at July 31,
Long-lived assets	462	491	618
Other International Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales to unaffiliated customers	5,405	5,325	5,777
Long-lived assets at July 31,
Long-lived assets	$ 345	$ 401	$ 426