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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jan. 31, 2019
Text Block [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the six months ended January 31, 2019, were as follows:
 
IDS
 
WPS
 
Total
Balance as of July 31, 2018
$
385,524

 
$
34,291

 
$
419,815

Translation adjustments
(2,178
)
 
(397
)
 
(2,575
)
Balance as of January 31, 2019
$
383,346

 
$
33,894

 
$
417,240
Other Intangible Assets
The net book value of these assets was as follows:
 
January 31, 2019
 
July 31, 2018
 
Weighted
Average
Amortization
Period
(Years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Book
Value
 
Weighted
Average
Amortization
Period
(Years)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Book
Value
Amortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Patents
5
 
$
1,448

 
$
(1,195
)
 
$
253

 
5
 
$
1,448

 
$
(942
)
 
$
506

Trademarks and other
10
 
2,467

 
(2,398
)
 
69

 
9
 
4,497

 
(4,395
)
 
102

Customer relationships
8
 
48,465

 
(28,607
)
 
19,858

 
9
 
55,999

 
(33,535
)
 
22,464

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trademarks
N/A
 
19,472

 
—

 
19,472

 
N/A
 
19,516

 
—

 
19,516

Total
 
 
$
71,852

 
$
(32,200
)
 
$
39,652

 
 
 
$
81,460

 
$
(38,872
)
 
$
42,588