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Product Warranties (Tables)
 3 Months Ended
Dec. 30, 2017
Product Warranties Disclosures [Abstract]  
Summary of Activity in Warranty Accrual
Activity in the warranty accrual is summarized as follows:
 
 
Three Months Ended
 
 
December 30,
2017
 
December 31,
2016
Warranty accrual at beginning of period
 
$
25,848

 
$
21,363

Warranties issued during current period
 
4,757

 
3,414

Adjustments to pre-existing warranties
 
(70
)
 
(265
)
Reductions for settling warranties
 
(2,915
)
 
(1,044
)
Foreign currency translation
 
128

 
(585
)
Warranty accrual at end of period
 
$
27,748

 
$
22,883