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Intangible Assets
 12 Months Ended
Mar. 31, 2020
Intangible Assets [Abstract]  
Intangible Assets

Note 13: Intangible Assets

Intangible assets consisted of the following:

  
March 31, 2020
    
March 31, 2019
  
   
Gross
Carrying
Value
    
Accumulated
Amortization
    
Net
Intangible
Assets
    
Gross
Carrying
Value
    
Accumulated
Amortization
    
Net
Intangible
Assets
  
Customer relationships
  
$
60.8
    
$
(12.6
)
  
$
48.2
    
$
61.5
    
$
(9.1
)
  
$
52.4
  
Trade names
    
58.3
      
(16.2
)
    
42.1
      
58.9
      
(13.5
)
    
45.4
  
Acquired technology
    
23.6
      
(7.6
)
    
16.0
      
23.9
      
(5.5
)
    
18.4
  
Total intangible assets
  
$
142.7
    
$
(36.4
)
  
$
106.3
    
$
144.3
    
$
(28.1
)
  
$
116.2
  

The Company recorded $8.9 million, $9.0 million, and $9.7 million of amortization expense during fiscal 2020, 2019, and 2018, respectively.  The Company estimates that it will record $8.4 million of amortization expense in fiscal 2021 and approximately $8.0 million of annual amortization expense in fiscal 2022 through 2025.

During fiscal 2018, the BHVAC segment discontinued its geothermal product line and, as a result, recorded a $1.2 million impairment charge for acquired technology intangible assets.