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Segment Reporting (Tables)
 6 Months Ended
Jul. 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
 
Six Months Ended
 
July 31,
2013
 
July 31,
2012
 
July 31,
2013
 
July 31,
2012
Net sales
 
 
 
 
 
 
 
Applied Technology Division
$
39,091

 
$
40,071

 
$
90,272

 
$
93,812

Engineered Films Division
37,264

 
36,785

 
71,757

 
77,879

Aerostar Division
20,722

 
26,845

 
42,437

 
52,480

Intersegment eliminations (a)
(3,656
)
 
(2,027
)
 
(7,365
)
 
(4,582
)
Consolidated net sales
$
93,421

 
$
101,674

 
$
197,101

 
$
219,589

 
 
 
 
 
 
 
 
Operating income
 
 
 
 
 
 
 
Applied Technology Division
$
11,870

 
$
12,909

 
$
31,027

 
$
34,959

Engineered Films Division
4,770

 
6,819

 
9,524

 
15,998

Aerostar Division
964

 
2,309

 
2,770

 
3,751

Intersegment eliminations (a)
(17
)
 
17

 
(38
)
 
(62
)
Total reportable segment income
17,587

 
22,054

 
43,283

 
54,646

Administrative and general expenses
(5,019
)
 
(4,647
)
 
(9,781
)
 
(8,807
)
Consolidated operating income
$
12,568

 
$
17,407

 
$
33,502

 
$
45,839


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