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Segment Reporting (Tables)
 6 Months Ended
Jul. 31, 2014
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
 
Six Months Ended
 
July 31,
2014
 
July 31,
2013
 
July 31,
2014
 
July 31,
2013
Net sales
 
 
 
 
 
 
 
Applied Technology Division
$
36,247

 
$
39,091

 
$
82,535

 
$
90,272

Engineered Films Division
42,299

 
37,264

 
84,506

 
71,757

Aerostar Division
19,257

 
20,722

 
36,922

 
42,437

Intersegment eliminations (a)
(3,318
)
 
(3,656
)
 
(6,968
)
 
(7,365
)
Consolidated net sales
$
94,485

 
$
93,421

 
$
196,995

 
$
197,101

 
 
 
 
 
 
 
 
Operating income
 
 
 
 
 
 
 
Applied Technology Division
$
8,829

 
$
11,870

 
$
24,685

 
$
31,027

Engineered Films Division
5,816

 
4,770

 
11,679

 
9,524

Aerostar Division
1,628

 
964

 
1,639

 
2,770

Intersegment eliminations (a)
(82
)
 
(17
)
 
(20
)
 
(38
)
Total reportable segment income
16,191

 
17,587

 
37,983

 
43,283

Administrative and general expenses
(5,495
)
 
(5,019
)
 
(10,755
)
 
(9,781
)
Consolidated operating income
$
10,696

 
$
12,568

 
$
27,228

 
$
33,502


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