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Selected Balance Sheet Information (Tables)
 9 Months Ended
Oct. 31, 2013
Selected Balance Sheet Information [Abstract]  
Components of selected balance sheet items
Following are the components of selected items from the Consolidated Balance Sheets:
 
 
 
 
 
 
 
 
 
October 31, 2013
 
January 31, 2013
 
October 31, 2012
Accounts receivable, net:
 
 
 
 
 
 
     Trade accounts
 
$
64,164

 
$
56,508

 
$
55,667

     Allowance for doubtful accounts
 
(204
)
 
(205
)
 
(205
)
 
 
$
63,960

 
$
56,303

 
$
55,462

Inventories:
 
 
 
 
 
 
Finished goods
 
$
7,591

 
$
8,571

 
$
8,347

In process
 
2,743

 
2,675

 
3,647

Materials
 
41,062

 
34,943

 
38,030

 

$
51,396


$
46,189


$
50,024

Property, plant and equipment, net:
 
 
 
 
 
 
     Property, plant and equipment
 
$
177,428

 
$
156,658

 
$
151,122

     Accumulated depreciation
 
(81,624
)
 
(75,420
)
 
(73,730
)
 
 
$
95,804

 
$
81,238

 
$
77,392

Accrued liabilities:
 
 
 
 
 
 
Salaries and benefits
 
$
3,120

 
$
4,265

 
$
5,175

Vacation
 
4,149

 
4,025

 
4,038

401(k) contributions
 
446

 
520

 
500

Insurance obligations
 
2,496

 
2,506

 
2,949

Warranties
 
2,210

 
1,888

 
1,879

Acquisition-related contingent liabilities
 
730

 
712

 
7,154

Taxes - accrued and withheld
 
3,754

 
1,392

 
1,990

Other
 
1,689

 
1,884

 
1,563

 
 
$
18,594

 
$
17,192

 
$
25,248

Other liabilities:
 
 
 
 
 
 
Postretirement benefits
 
$
8,304

 
$
8,072

 
$
7,589

Acquisition-related contingent consideration
 
2,323

 
2,359

 
2,231

Deferred income taxes
 
1,824

 
2,453

 
3,477

Uncertain tax positions
 
6,206

 
5,818

 
5,881

 
 
$
18,657

 
$
18,702

 
$
19,178