Goodwill and intangible assets (Tables)

6 Months Ended

Jan. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Indefinite-Lived Intangible Assets [Table Text Block]

The Company’s change in the carrying amount of intangible assets, all in the Life Sciences segment is as follows:

	Gross		Accumulated Amortization			Net
July 31, 2017	$	27,436	$	(24,541	)	$	2,895
Amortization expense		—		(484	)		(484	)
Foreign currency translation		302		(264	)		38
January 31, 2018	$	27,738	$	(25,289	)	$	2,449

Schedule of Intangible Assets [Table Text Block]

Intangible assets, all finite lived, consist of the following:

	January 31, 2018							July 31, 2017
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
Patents	$	11,027	$	(10,964	)	$	63	$	11,027	$	(10,951	)	$	76
Customer relationships		12,046		(9,667	)		2,379		11,881		(9,083	)		2,798
Website and acquired content		1,022		(1,022	)		—		1,011		(1,011	)		—
Licensed technology and other		498		(491	)		7		484		(463	)		21
Trademarks		3,145		(3,145	)		—		3,033		(3,033	)		—
Total	$	27,738	$	(25,289	)	$	2,449	$	27,436	$	(24,541	)	$	2,895

Schedule of Useful Lives For Acquisitions [Table Text Block]

At January 31, 2018, information with respect to intangibles assets acquired is as follows:

	Useful life assigned	Weighted average remaining useful life
Customer relationships	8 -15 years	3 years
Other intangibles	10 years	2 years