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Capital Assets (Tables)
 6 Months Ended
Apr. 01, 2017
Capital Assets [Abstract]  
Property And Equipment
Property and equipment are as follows: 
(in thousands)
 
April 1,
2017
 
October 1,
2016
Land and improvements
 
$
2,863

 
$
2,865

Buildings and improvements
 
59,329

 
59,350

Machinery and equipment
 
195,172

 
189,406

Property and equipment, gross
 
257,364

 
251,621

Less accumulated depreciation
 
(158,233
)
 
(150,832
)
Property and equipment, net
 
$
99,131

 
$
100,789
Goodwill
Changes to the carrying amount of goodwill are as follows:  
(in thousands)
 
Test  
 
Sensors  
 
Total  
Balance, October 1, 2016
 
$
25,022

 
$
344,678

 
$
369,700

Currency translation gain (loss)
 
(440
)
 
(36
)
 
(476
)
Balance, April 1, 2017
 
$
24,582

 
$
344,642

 
$
369,224
Other Intangible Assets
Other intangible assets are as follows: 
 
 
April 1, 2017
(in thousands)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Weighted
Average
Useful Life (in Years)
Software development costs
 
$
24,537

 
$
(15,384
)
 
$
9,153

 
6.0
Technology and patents
 
46,372

 
(7,684
)
 
38,688

 
14.9
Trademarks and trade names
 
6,736

 
(2,145
)
 
4,591

 
25.4
Customer lists
 
156,965

 
(8,353
)
 
148,612

 
15.8
Land-use rights
 
2,331

 
(362
)
 
1,969

 
26.0
Trademarks and trade names
 
57,500

 
—

 
57,500

 
Indefinite
Total intangible assets
 
$
294,441

 
$
(33,928
)
 
$
260,513

 
15.0
 
 
 
October 1, 2016
(in thousands)
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Value
 
Weighted
Average
Useful Life (in Years)
Software development costs
 
$
23,184

 
$
(14,938
)
 
$
8,246

 
6.0
Technology and patents
 
46,672

 
(6,360
)
 
40,312

 
14.9
Trademarks and trade names
 
6,903

 
(1,911
)
 
4,992

 
25.5
Customer lists
 
156,987

 
(3,372
)
 
153,615

 
15.8
Land-use rights
 
2,369

 
(245
)
 
2,124

 
26.3
Trademarks and trade names
 
57,500

 
—

 
57,500

 
Indefinite
Total intangible assets
 
$
293,615

 
$
(26,826
)
 
$
266,789

 
15.1
Estimated Future Amortization Expense On Other Intangible Assets
The estimated future amortization expense related to other amortizable intangible assets for the next five fiscal years and thereafter is as follows: 
 
 
Fiscal Year
Amortization Expense
(in thousands)
Remainder of 2017
$
7,277

2018
$
13,693

2019
$
13,568

2020
$
13,287

2021
$
13,287

2022
$
13,104

Thereafter
$
128,797