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Intangible Assets
 12 Months Ended
Mar. 31, 2018
Intangible Assets [Abstract]  
Intangible Assets
Note 12:
Intangible Assets

Intangible assets consisted of the following:

  
March 31, 2018
  
March 31, 2017
 
  
Gross
Carrying
Value
  
Accumulated
Amortization
  
Net
Intangible
Assets
  
Gross
Carrying
Value
  
Accumulated
Amortization
  
Net
Intangible
Assets
 
Customer relationships
 
$
64.2
  
$
(5.7
)
 
$
58.5
  
$
60.5
  
$
(1.7
)
 
$
58.8
 
Trade names
  
60.6
   
(10.8
)
  
49.8
   
58.4
   
(7.2
)
  
51.2
 
Acquired technology
  
25.2
   
(3.6
)
  
21.6
   
27.0
   
(2.9
)
  
24.1
 
Total intangible assets
 
$
150.0
  
$
(20.1
)
 
$
129.9
  
$
145.9
  
$
(11.8
)
 
$
134.1
 

During the fourth quarter of 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 it will no longer use.  Annual revenue for this discontinued product line was less than $1.0 million.

The Company recorded $9.7 million, $4.1 million, and $1.6 million of amortization expense during fiscal 2018, 2017, and 2016, respectively.  The Company estimates that it will record approximately $9.0 million of amortization expense in each of the next five fiscal years.