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Intangible Assets
 12 Months Ended
Mar. 31, 2019
Intangible Assets [Abstract]  
Intangible Assets
Note 14:
Intangible Assets

Intangible assets consisted of the following:

  
March 31, 2019
  
March 31, 2018
 
  
Gross
Carrying
Value
  
Accumulated
Amortization
  
Net
Intangible
Assets
  
Gross
Carrying
Value
  
Accumulated
Amortization
  
Net
Intangible
Assets
 
Customer relationships
 
$
61.5
  
$
(9.1
)
 
$
52.4
  
$
64.2
  
$
(5.7
)
 
$
58.5
 
Trade names
  
58.9
   
(13.5
)
  
45.4
   
60.6
   
(10.8
)
  
49.8
 
Acquired technology
  
23.9
   
(5.5
)
  
18.4
   
25.2
   
(3.6
)
  
21.6
 
Total intangible assets
 
$
144.3
  
$
(28.1
)
 
$
116.2
  
$
150.0
  
$
(20.1
)
 
$
129.9
 

The Company recorded $9.0 million, $9.7 million, and $4.1 million of amortization expense during fiscal 2019, 2018, and 2017, respectively.  The Company estimates that it will record $9.0 million of amortization expense in fiscal 2020 and approximately $8.0 million of annual amortization expense in fiscal 2021 through 2024.

During fiscal 2018, the BHVAC segment discontinued its geothermal product line and, as a result, recorded a $1.2 million impairment for acquired technology intangible assets it will no longer use.  Annual revenue for this discontinued product line was less than $1.0 million.