Reportable Segments - Reportable Segments Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Sep. 29, 2018
Net sales	$ 765,544	$ 677,294
Operating income (loss):	36,951	31,557
Interest expense	(2,249)	(3,725)
Interest income	525	1,555
Miscellaneous, net	(1,112)	(346)
Income before income taxes	34,115	29,041
Total assets	1,969,683		$ 1,932,642
Elimination of inter-segment sales
Net sales	(38,733)	(31,704)
Corporate
Operating income (loss):	(30,306)	(28,377)
Corporate and eliminations
Total assets	69,029		155,544
AMER | Operating Segments
Net sales	353,867	299,043
Operating income (loss):	14,450	10,523
Total assets	718,078		645,791
APAC | Operating Segments
Net sales	378,112	346,123
Operating income (loss):	51,811	50,532
Total assets	989,574		937,510
EMEA | Operating Segments
Net sales	72,298	63,832
Operating income (loss):	996	$ (1,121)
Total assets	$ 193,002		$ 193,797