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Segment Reporting (Tables)
 9 Months Ended
Oct. 31, 2013
Segment Reporting [Abstract]  
Business segment net sales and operating income results
Business segment net sales and operating income results are as follows:
 
Three Months Ended
 
Nine Months Ended
 
October 31,
2013
 
October 31,
2012
 
October 31,
2013
 
October 31,
2012
Net sales
 
 
 
 
 
 
 
Applied Technology Division
$
43,797

 
$
39,534

 
$
134,069

 
$
133,346

Engineered Films Division
40,241

 
33,316

 
111,998

 
111,195

Aerostar Division
24,269

 
26,385

 
66,706

 
78,865

Intersegment eliminations (a)
(3,369
)
 
(2,224
)
 
(10,734
)
 
(6,806
)
Consolidated net sales
$
104,938

 
$
97,011

 
$
302,039

 
$
316,600

 
 
 
 
 
 
 
 
Operating income
 
 
 
 
 
 
 
Applied Technology Division
$
15,149

 
$
12,289

 
$
46,176

 
$
47,248

Engineered Films Division
5,241

 
4,729

 
14,765

 
20,727

Aerostar Division
2,714

 
3,830

 
5,484

 
7,581

Intersegment eliminations (a)
(23
)
 
(25
)
 
(61
)
 
(87
)
Total reportable segment income
23,081

 
20,823

 
66,364

 
75,469

Administrative and general expenses
(4,949
)
 
(4,451
)
 
(14,730
)
 
(13,258
)
Consolidated operating income
$
18,132

 
$
16,372

 
$
51,634

 
$
62,211


(a) Intersegment sales were primarily from Aerostar to Applied Technology.