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Product Warranties (Tables)
 9 Months Ended
Jun. 30, 2018
Product Warranties Disclosures [Abstract]  
Summary of Activity in Warranty Accrual
Activity in the warranty accrual is summarized as follows:
 
 
Three Months Ended
 
Nine Months Ended
 
 
June 30,
2018
 
July 1,
2017
 
June 30,
2018
 
July 1,
2017
Warranty accrual at beginning of period
 
$
28,255

 
$
23,272

 
$
25,848

 
$
21,363

Additions from acquisitions
 
—

 
433

 
—

 
433

Warranties issued during current period
 
3,451

 
4,030

 
11,488

 
12,185

Adjustments to pre-existing warranties
 
(80
)
 
(124
)
 
(325
)
 
(495
)
Reductions for settling warranties
 
(3,219
)
 
(4,046
)
 
(9,141
)
 
(9,509
)
Foreign currency translation
 
(701
)
 
420

 
(164
)
 
8

Warranty accrual at end of period
 
$
27,706

 
$
23,985

 
$
27,706

 
$
23,985