Warranty Obligations (Warranty Provisions and Claims) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Mar. 30, 2019	Mar. 31, 2018
Product Warranty Liability [Line Items]
Number of previous months historical warranty claims used to calculate warranty expense percentage			12 months
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning accrued warranty costs	$ 5,229	$ 5,832	$ 5,418	$ 6,018
Warranty claims	(1,167)	(1,410)	(2,446)	(2,585)
Warranty provisions	697	1,742	1,791	2,727
Adjustments to preexisting warranties	(15)	14	(15)	14
Currency translation	(3)	13	(7)	17
Ending accrued warranty costs	$ 4,741	$ 6,191	$ 4,741	$ 6,191
Minimum
Product Warranty Liability [Line Items]
Life of warranty obligations for sales that include installation services in months			12 months
Product obligation period from date of purchase in months			12 months
Maximum
Product Warranty Liability [Line Items]
Life of warranty obligations for sales that include installation services in months			24 months
Product obligation period from date of purchase in months			24 months