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Product Warranties
 6 Months Ended
Mar. 31, 2018
Product Warranties Disclosures [Abstract]  
Product Warranties
Product Warranties
In the ordinary course of business, we warrant our products against defects in design, materials and workmanship typically over periods ranging from twelve to sixty months. We determine warranty reserves needed by product line based on historical experience and current facts and circumstances. 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