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Warranty (Tables)
 12 Months Ended
Mar. 31, 2019
Guarantees [Abstract]  
Analysis Of Changes In Liability For Product Warranties As warranty estimates are forecasts that are based on the best available information, primarily historical claims experience, claims costs may ultimately differ from amounts provided. An analysis of changes in the liability for product warranties is as follows:
 
 
Fiscal year ended March 31,
 
 
2019
 
2018
 
2017
Balance at beginning of year
 
$
50,602

 
$
46,116

 
$
48,422

Current year provisions
 
23,679

 
21,706

 
17,852

Costs incurred
 
(25,053
)
 
(18,820
)
 
(15,945
)
Warranty reserves of acquired business - Alpha
 
7,535

 
—

 
—

Foreign currency translation adjustment
 
(2,195
)
 
1,600

 
(4,213
)
Balance at end of year
 
$
54,568

 
$
50,602

 
$
46,116