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Product Warranty (Tables)
 12 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Reconciliation of the Change in Aggregate Accrual for Product Warranty
The following is a reconciliation of the changes in the aggregate product warranty accrual for 2018, 2017 and 2016:
(In thousands)
2018
 
2017
 
2016
Product warranty accrual, beginning
$
5,474

 
$
5,734

 
$
3,342

Warranty charges incurred, net
(11,247
)
 
(8,297
)
 
(7,781
)
Provision for warranty charges
15,993

 
8,037

 
10,173

Product warranty accrual, ending
$
10,220

 
$
5,474

 
$
5,734