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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Apr. 30, 2016
Text Block [Abstract]  
Changes in Carrying Amount of Goodwill
Changes in the carrying amount of goodwill for the nine months ended April 30, 2016, were as follows:
 
IDS
 
WPS
 
Total
Balance as of July 31, 2015
$
382,786

 
$
50,413

 
$
433,199

Translation adjustments
4,128

 
(1,136
)
 
$
2,992

Balance as of April 30, 2016
$
386,914

 
$
49,277

 
$
436,191
Other Intangible Assets
The net book value of these assets was as follows:
 
 
April 30, 2016
 
July 31, 2015
 
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
 
$
12,218

 
$
(10,989
)
 
$
1,229

 
5
 
$
12,073

 
$
(10,641
)
 
$
1,432

Trademarks and other
5
 
14,459

 
(13,713
)
 
746

 
5
 
14,375

 
(12,471
)
 
1,904

Customer relationships
7
 
137,520

 
(100,621
)
 
36,899

 
7
 
136,693

 
(94,537
)
 
42,156

Non-compete agreements and other
4
 
9,184

 
(9,168
)
 
16

 
4
 
9,076

 
(9,032
)
 
44

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trademarks
N/A
 
23,370

 
—

 
23,370

 
N/A
 
23,352

 
—

 
23,352

Total
 
 
$
196,751

 
$
(134,491
)
 
$
62,260

 
 
 
$
195,569

 
$
(126,681
)
 
$
68,888