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Goodwill and Intangible Assets
3 Months Ended
Oct. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Other Intangible Assets
Changes in the carrying amount of goodwill for the three months ended October 31, 2017, were as follows:
 
IDS
 
WPS
 
Total
Balance as of July 31, 2017
$
391,864

 
$
45,833

 
$
437,697

Translation adjustments
(3,123
)
 
(870
)
 
(3,993
)
Balance as of October 31, 2017
$
388,741

 
$
44,963

 
$
433,704



Goodwill at October 31, 2017 and July 31, 2017, was net of $118,637 and $209,392 of accumulated impairment losses within the ID Solutions ("IDS") and Workplace Safety ("WPS") segments, respectively, for a total of $328,029. There were no impairment charges recorded during the three months ended October 31, 2017.

Other intangible assets include patents, trademarks, and customer relationships with finite lives being amortized in accordance with the accounting guidance for other intangible assets. The Company also has unamortized indefinite-lived trademarks that are classified as other intangible assets. The net book value of these assets was as follows:
 
 
October 31, 2017
 
July 31, 2017
 
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
 
$
1,395

 
$
(591
)
 
$
804

 
5
 
$
1,358

 
$
(471
)
 
$
887

Trademarks and other
9
 
4,485

 
(4,271
)
 
214

 
9
 
4,528

 
(4,229
)
 
299

Customer relationships
8
 
60,349

 
(33,045
)
 
27,304

 
8
 
60,759

 
(31,909
)
 
28,850

Unamortized other intangible assets:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Trademarks
N/A
 
22,878

 

 
22,878

 
N/A
 
23,040

 

 
23,040

Total
 
 
$
89,107

 
$
(37,907
)
 
$
51,200

 
 
 
$
89,685

 
$
(36,609
)
 
$
53,076


The decrease in the gross carrying amount of other intangible assets as of October 31, 2017 compared to July 31, 2017 was due to the effects of currency fluctuations during the three-month period.
Amortization expense on intangible assets was $1,693 and $1,895 for the three months ended October 31, 2017 and 2016, respectively. The amortization expense over each of the next five fiscal years is projected to be $6,445, $6,195, $5,196, $5,155 and $5,008 for the fiscal years ending July 31, 2018, 2019, 2020, 2021 and 2022, respectively.