Intangible Assets (Tables)

6 Months Ended

Jan. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets are summarized as follows (in thousands):

	Numberof Years		January 31, 2018
	Weighted							Foreign
	Average							Currency
	Amortization		Original		Accumulated			Translation			Carrying
	Period		Cost		Amortization			Adjustment			Amount
Intangible assets subject to amortization (range of    useful life):
Electronic chemicals-value of product qualifications    (5-15 years)		14.1	$	14,100	$	(5,912	)	$	(483	)	$	7,705
Performance materials-customer relationships    (15-20 years)		19.7		218,106		(8,465	)		74			209,715
Performance materials-proprietary manufacturing process    (15 years)		15.0		39,323		(1,639	)		—			37,684
Electronic chemicals-other (1-15 years)		7.4		2,649		(1,892	)		(73	)		684
Performance materials-other (5-15 years)		6.2		3,160		(562	)		73			2,671
Total intangible assets subject to amortization		18.5	$	277,338	$	(18,470	)	$	(409	)	$	258,459
Intangible assets not subject to amortization:
Performance materials-penta product registrations												8,765
Performance materials-related trade name and trademark												37,496
Performance materials-proprietary manufacturing process												2,808
Total intangible assets not subject to amortization												49,069
Total intangible assets, net											$	307,528

	Numberof Years		July 31, 2017
	Weighted							Foreign
	Average							Currency
	Amortization		Original		Accumulated			Translation			Carrying
	Period		Cost		Amortization			Adjustment			Amount
Intangible assets subject to amortization (range of    useful life):
Electronic chemicals-value of product qualifications    (5-15 years)		14.1	$	14,100	$	(5,479	)	$	(841	)	$	7,780
Performance materials-customer relationships    (15-20 years)		19.7		227,521		(3,244	)		54			224,331
Performance materials-proprietary manufacturing process    (15 years)		15.0		39,245		(322	)		—			38,923
Electronic chemicals-other (1-15 years)		7.4		2,649		(1,740	)		(114	)		795
Performance materials-other (5-15 years)		6.2		3,160		(289	)		54			2,925
Total intangible assets subject to amortization		13.6	$	286,675	$	(11,074	)	$	(847	)	$	274,754
Intangible assets not subject to amortization:
Performance materials-penta product registrations												8,765
Performance materials-related trade name and trademark												34,074
Performance materials-proprietary manufacturing process												2,808
Total intangible assets not subject to amortization												45,647
Total intangible assets, net											$	320,401