Goodwill and Intangible Assets
 12 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
3. GOODWILL AND INTANGIBLE ASSETS
Changes to the carrying amount of goodwill for the years ended March 31, 2020 and 2019 were as follows:
  
 
Healthcare Products
Segment
 
Healthcare Specialty Services Segment
 
Life Sciences
Segment
 
Applied Sterilization Technologies Segment
 
Total
Balance at March 31, 2018
 
404,674

 
388,025

 
148,816

 
1,492,269

 
2,433,784

Goodwill acquired or allocated
 
(1,202
)
 
(907
)
 
—

 
5,341

 
3,232

Foreign currency translation adjustments
 
(6,188
)
 
(12,208
)
 
(1,021
)
 
(94,671
)
 
(114,088
)
Balance at March 31, 2019
 
$
397,284

 
$
374,910

 
$
147,795

 
$
1,402,939

 
$
2,322,928

Goodwill acquired or allocated
 
65,222

 
1,364

 
—

 
7,945

 
74,531

Divestitures
 
—

 
(199
)
 
—

 
—

 
(199
)
Foreign currency translation adjustments
 
(3,499
)
 
(7,816
)
 
762

 
(30,622
)
 
(41,175
)
Balance at March 31, 2020
 
$
459,007

 
$
368,259

 
$
148,557

 
$
1,380,262

 
$
2,356,085


See Note 18, titled "Business Acquisitions and Divestitures" for additional information regarding our recent business acquisitions and divestitures.
We evaluate the recoverability of recorded goodwill amounts annually during the third fiscal quarter, or when evidence of potential impairment exists. As a result of our annual impairment review of goodwill for fiscal years 2020, 2019 and 2018, no indicators of impairment were identified.

Information regarding our intangible assets is as follows:
 
 
2020
 
2019
March 31,
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Gross
Carrying
Amount
 
Accumulated
Amortization
       Customer relationships
 
$
614,162

 
$
227,581

 
$
623,774

 
$
189,752

       Non-compete agreements
 
4,646

 
4,012

 
4,693

 
3,945

       Patents and technology
 
259,101

 
145,457

 
226,520

 
126,149

       Trademarks and tradenames
 
62,543

 
39,942

 
63,570

 
38,850

       Supplier relationships
 
54,800

 
12,787

 
54,800

 
10,047

       Total
 
$
995,252

 
$
429,779

 
$
973,357

 
$
368,743


Certain trademarks and tradenames obtained as a result of business combinations are indefinite-lived assets. The approximate carrying value of these assets at March 31, 2020 and March 31, 2019 was $14,250 and $13,000, respectively. We evaluate our indefinite-lived intangible assets annually during the third quarter, or when evidence of potential impairment exists. No impairment was recognized for fiscal year 2020. During the third quarter of fiscal 2019, management adopted a branding strategy that included phasing out the usage of a tradename associated with certain products in the Healthcare Products business segment. As a result, management recorded an impairment charge of $16,249, which is included within the Selling, general, and administrative line of the Consolidated Statements of Income. The remaining fair value of the asset was calculated using an income approach (the relief from royalty method). The remaining fair value was not material and will be amortized over the asset's remaining useful life. Fair value calculated using this approach is classified within Level 3 of the fair value hierarchy and requires several assumptions.
Total amortization expense for intangible assets was $74,528, $98,747, and $70,195 for the years ended March 31, 2020, 2019, and 2018, respectively. Based upon the current amount of intangible assets subject to amortization, the amortization expense for each of the five succeeding fiscal years is estimated to be as follows:
  
 
2021
 
2022
 
2023
 
2024
 
2025
Estimated amortization expense
 
$
71,049

 
$
68,393

 
$
62,808

 
$
56,549

 
$
54,772


The estimated annual amortization expense presented in the preceding table has been calculated based upon March 31, 2020 currency exchange rates.