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Goodwill and Intangible Assets (Tables)
 12 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of the Company's intangible assets
The following table highlights the Company’s intangible assets (amounts in thousands):
 
 
March 31, 2019
 
March 31, 2018
 
 
Carrying
Amount
 
Accumulated
Amortization
 
Net Amount
 
Carrying
Amount
 
Accumulated
Amortization
 
Net Amount
Indefinite Lived Intangible Assets:
 
 
 
 
 
 
 
 
 
 
 
 
Trademarks
 
$
15,151

 
$
—

 
$
15,151

 
$
15,474

 
$
—

 
$
15,474

Amortizing Intangibles:
 
 
 
 
 
 
 
 
 
 
 
 
Patents (10 - 18 years)
 
26,662

 
(12,046
)
 
14,616

 
26,662

 
(10,625
)
 
16,037

Customer relationships (10 - 21 years
 
37,850

 
(13,868
)
 
23,982

 
40,131

 
(11,735
)
 
28,396

Other
 
214

 
(214
)
 
—

 
238

 
(238
)
 
—

Total amortizing intangibles
 
64,726

 
(26,128
)
 
38,598

 
67,031

 
(22,598
)
 
44,433

Total intangible assets
 
$
79,877

 
$
(26,128
)
 
$
53,749

 
$
82,505

 
$
(22,598
)
 
$
59,907
Summary of changes in carrying amount of goodwill
For fiscal years ended March 31, 2019, 2018, and 2017, amortization related to intangibles was $4.5 million, $4.3 million and $2.1 million, respectively, consisting of amortization related to patents of $1.4 million, $1.4 million, and $1.5 million, respectively, and amortization related to customer relationships of $3.1 million, $2.9 million, and $0.6 million, respectively.
The weighted-average useful life as of March 31, 2019 and 2018 for patents was 15.8 years and for customer relationships was 12.3 years. The weighted-average period prior to the next renewal for patents was 2.5 years and 3.5 years as of March 31, 2019 and 2018, respectively. Estimated amortization of intangible assets for each of the next five fiscal years is $4.5 million, and thereafter, amortization will total $16.1 million. Estimated amortization of patents for each of the next five fiscal years is $1.4 million, and thereafter, amortization will total $7.5 million. Estimated amortization of customer relationships for each of the next five fiscal years is $3.1 million, and thereafter, amortization will total $8.6 million.
For fiscal year 2019, the Company completed its impairment test on goodwill and intangible assets with indefinite useful lives as of January 1, 2019 and concluded that goodwill and indefinite-lived assets were not impaired. The were no changes to the carrying amount of goodwill for the years ended March 31, 2019 and 2018. As of March 31, 2019, and 2018, the carrying amount of goodwill was $40.3 million.