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Segment Reporting (Tables)
 9 Months Ended
Oct. 31, 2017
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,
2017
 
October 31,
2016
 
October 31,
2017
 
October 31,
2016
Net sales
 
 
 
 
 
 
 
Applied Technology
$
25,319

 
$
25,203

 
$
94,233

 
$
79,327

Engineered Films
65,108

 
38,551

 
157,691

 
104,307

Aerostar
11,103

 
9,003

 
30,078

 
25,313

Intersegment eliminations (a)
(181
)
 
(235
)
 
(508
)
 
(467
)
Consolidated net sales
$
101,349

 
$
72,522

 
$
281,494

 
$
208,480

 
 
 
 
 
 
 
 
Operating income (loss)(b)
 
 
 
 
 
 
 
Applied Technology 
$
5,357

 
$
6,415

 
$
25,447

 
$
20,280

Engineered Films
17,115

 
7,129

 
35,386

 
17,666

Aerostar(c)
1,359

 
(1,375
)
 
4,165

 
(1,804
)
Intersegment eliminations 
(12
)
 
(16
)
 
(3
)
 
(21
)
Total reportable segment income
23,819

 
12,153

 
64,995

 
36,121

General and administrative expenses(d)
(5,990
)
 
(4,764
)
 
(17,247
)
 
(13,986
)
Consolidated operating income
$
17,829

 
$
7,389

 
$
47,748

 
$
22,135


(a) Intersegment sales for both fiscal 2018 and 2017 were primarily sales from Engineered Films to Aerostar.
(b) At the segment level, operating income (loss) does not include an allocation of general and administrative expenses.
(c) The three- and nine-month periods ended October 31, 2016 include inventory write-downs of $2,278 as a result of a strategic decision to narrow certain radar product offerings.
(d) At the segment level, operating income (loss) does not include an allocation of general and administrative expenses and, as a result, "General and administrative expenses" are reported as a deduction from "Total reportable segment income" to reconcile to "Operating income" reported in the Consolidated Statements of Income and Comprehensive Income.