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

Segment reporting (Details) - Geographic financial information - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 81,170	$ 101,013	$ 105,086
Long-lived assets	22,593	16,974
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	72,387	91,688	96,751
Long-lived assets	22,057	16,210
SWITZERLAND
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	2,611	2,584	2,371
Long-lived assets	376	502
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	1,611	1,851	1,673
Long-lived assets	64	127
Other International Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	4,561	4,890	$ 4,291
Long-lived assets	$ 96	$ 135