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DETAILS OF CERTAIN BALANCE SHEET ACCOUNTS (Tables)
 12 Months Ended
Mar. 31, 2018
Balance Sheet Related Disclosures [Abstract]  
Accounts receivable, net
Accounts receivable, net:
 
 
March 31,
(in thousands)
 
2017
 
2018
Accounts receivable
 
$
184,068

 
$
202,270

Provisions for returns
 
(10,541
)
 
(10,225
)
Provisions for promotions and rebates
 
(31,747
)
 
(38,284
)
Provisions for doubtful accounts and sales allowances
 
(603
)
 
(873
)
Accounts receivable, net
 
$
141,177

 
$
152,888
Inventory, net
Inventory, net:
 
 
March 31,
(in thousands)
 
2017
 
2018
Raw materials
 
$
20,260

 
$
28,789

Work in process
 
215

 
450

Finished goods
 
34,981

 
39,037

Inventory, net
 
$
55,456

 
$
68,276
Property, Plant and Equipment
Property, plant, and equipment, net:
 
 
March 31,
(in thousands)
 
2017
 
2018
Land
 
$
16,418

 
$
16,564

Buildings and improvements (useful life: 7-30 years)
 
115,909

 
115,401

Machinery and equipment (useful life: 2-10 years)
 
108,477

 
112,719

Software (useful life: 5-10 years)
 
46,806

 
50,631

Construction in progress
 
6,899

 
5,428

Property, plant, and equipment, gross
 
294,509

 
300,743

Accumulated depreciation and amortization
 
(144,202
)
 
(158,614
)
Property, plant, and equipment, net
 
$
150,307

 
$
142,129
Accrued Liabilities
Accrued liabilities:
 
 
March 31,
(in thousands)
 
2017
 
2018
Employee compensation and benefits
 
$
36,415

 
$
28,599

Accrued interest on 5.50% Senior Notes
 
10,407

 
10,331

Warranty obligation, short-term portion
 
6,863

 
7,550

VAT/Sales Tax Payable
 
5,433

 
5,353

Derivative liabilities
 
1,323

 
2,947

Accrued other
 
13,844

 
25,317

Accrued liabilities
 
$
74,285

 
$
80,097


    
Changes in the warranty obligation accrual
Changes in the warranty obligation, which are included as a component of accrued liabilities in the consolidated balance sheets, are as follows:
 
 
Year ended March 31,
(in thousands)
 
2017
 
2018
Warranty obligation at beginning of year
 
$
8,537

 
$
8,697

Warranty provision related to products shipped
 
9,451

 
9,923

Deductions for warranty claims processed
 
(9,824
)
 
(10,193
)
Adjustments related to preexisting warranties
 
533

 
1,177

Warranty obligation at end of year 1
 
$
8,697

 
$
9,604



1 Includes both short-term and long-term portion of warranty obligation; the prior table shows only the short-term portion included in accrued liabilities on our consolidated balance sheet. The long-term portion is included in other long-term liabilities.