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Warranty Obligations (Tables)
 9 Months Ended
Jun. 30, 2018
Product Warranties Disclosures [Abstract]  
Warranty Provisions and Claims
Changes to accrued warranty costs are as follows: 
 
 
Three Months Ended
 
Nine Months Ended
 
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Beginning accrued warranty costs
 
$
6,191

 
$
5,240

 
$
6,018

 
$
5,718

Warranty claims
 
(1,384
)
 
(1,208
)
 
(3,969
)
 
(3,051
)
Warranty provisions
 
756

 
972

 
3,483

 
2,466

Adjustments to preexisting warranties
 
50

 
470

 
64

 
353

Currency translation
 
(24
)
 
21

 
(7
)
 
9

Ending accrued warranty costs
 
$
5,589

 
$
5,495

 
$
5,589

 
$
5,495