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Warranty Obligations
 6 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Warranty Obligations
WARRANTY OBLIGATIONS 
Sales of our products and systems are subject to limited warranty obligations that are included in customer contracts. For sales that include installation services, warranty obligations generally extend for a period of 12 to 24 months from the date of either shipment or acceptance based on the contract terms. Product obligations generally extend for a period of 12 to 24 months from the date of purchase. Certain products offered in our Sensors segment include a lifetime warranty.
Under the terms of these warranties, we are obligated to repair or replace any components or assemblies deemed defective due to workmanship or materials. We reserve the right to reject warranty claims where it is determined that failure is due to normal wear, customer modifications, improper maintenance or misuse. We record general warranty provisions based on an estimated warranty expense percentage applied to current period revenue. The percentage applied reflects our historical warranty claims experience over the preceding 12-month period. Both the experience percentage and the warranty liability are evaluated on an ongoing basis for adequacy. Warranty provisions are also recognized for certain unanticipated product claims that are individually significant.
Changes to accrued warranty costs are as follows: 
 
 
Three Months Ended
 
Six Months Ended
 
 
March 31,
2018
 
April 1,
2017
 
March 31,
2018
 
April 1,
2017
Beginning accrued warranty costs
 
$
5,832

 
$
5,402

 
$
6,018

 
$
5,718

Warranty claims
 
(1,410
)
 
(889
)
 
(2,585
)
 
(1,843
)
Warranty provisions
 
1,742

 
842

 
2,727

 
1,494

Adjustments to preexisting warranties
 
14

 
(122
)
 
14

 
(117
)
Currency translation
 
13

 
7

 
17

 
(12
)
Ending accrued warranty costs
 
$
6,191

 
$
5,240

 
$
6,191

 
$
5,240