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Warranty Obligations (Tables)
 3 Months Ended
Dec. 30, 2017
Product Warranties Disclosures [Abstract]  
Warranty Provisions and Claims
Changes to accrued warranty costs were as follows: 
 
 
Three Months Ended
 
 
December 30,
2017
 
December 31,
2016
Beginning accrued warranty costs
 
$
6,018

 
$
5,718

Warranty claims
 
(1,175
)
 
(954
)
Warranty provisions
 
985

 
652

Adjustments to preexisting warranties
 
—

 
5

Currency translation
 
4

 
(19
)
Ending accrued warranty costs
 
$
5,832

 
$
5,402