Warranty Obligations (Warranty Provisions and Claims) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 29, 2019	Jun. 30, 2018	Jun. 29, 2019	Jun. 30, 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	$ 4,741	$ 6,191	$ 5,418	$ 6,018
Warranty claims	(1,051)	(1,384)	(3,497)	(3,969)
Warranty provisions	150	756	1,941	3,483
Adjustments to preexisting warranties	0	50	(15)	64
Currency translation	3	(24)	(4)	(7)
Ending accrued warranty costs	$ 3,843	$ 5,589	$ 3,843	$ 5,589
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