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Product Warranties (Tables)
 12 Months Ended
Sep. 29, 2018
Product Warranties Disclosures [Abstract]  
Summary of Activity in Warranty Accrual Activity in the warranty accrual is summarized as follows:
 
 
2018
 
2017
 
2016
Warranty accrual at beginning of period
 
$
25,848

 
$
21,363

 
$
18,660

Additions from acquisitions
 
184

 
448

 
—

Warranties issued during current period
 
15,705

 
17,021

 
13,272

Adjustments to pre-existing warranties
 
(806
)
 
(509
)
 
(1,463
)
Reductions for settling warranties
 
(15,101
)
 
(12,747
)
 
(8,486
)
Foreign currency translation
 
(293
)
 
272

 
(620
)
Warranty accrual at end of period
 
$
25,537

 
$
25,848

 
$
21,363