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Product Warranties (Tables)
 6 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Summary of Activity in Warranty Accrual
Activity in the warranty accrual is summarized as follows:
 
 
Three Months Ended
 
Six Months Ended
 
 
March 31,
2018
 
April 1,
2017
 
March 31,
2018
 
April 1,
2017
Warranty accrual at beginning of period
 
$
27,748

 
$
22,883

 
$
25,848

 
$
21,363

Warranties issued during current period
 
3,280

 
4,741

 
8,037

 
8,155

Adjustments to pre-existing warranties
 
(175
)
 
(106
)
 
(245
)
 
(371
)
Reductions for settling warranties
 
(3,007
)
 
(4,419
)
 
(5,922
)
 
(5,463
)
Foreign currency translation
 
409

 
173

 
537

 
(412
)
Warranty accrual at end of period
 
$
28,255

 
$
23,272

 
$
28,255

 
$
23,272