Reportable Segments - Reportable Segments Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Sep. 30, 2017
Net sales	$ 677,294	$ 635,019
Operating income (loss)	31,557	33,903
Interest expense	(3,725)	(3,274)
Interest income	1,555	1,071
Miscellaneous	(346)	(674)
Income before income taxes	29,041	31,026
Total assets	1,916,207		$ 1,976,182
Elimination of inter-segment sales
Net sales	(31,704)	(29,050)
Corporate
Operating income (loss)	(28,377)	(26,899)
Corporate and eliminations
Total assets	46,297		44,390
AMER | Operating Segments
Net sales	299,043	314,651
Operating income (loss)	10,523	14,797
Total assets	567,275		595,851
APAC | Operating Segments
Net sales	346,123	309,969
Operating income (loss)	50,532	48,240
Total assets	1,127,066		1,163,111
EMEA | Operating Segments
Net sales	63,832	39,449
Operating income (loss)	(1,121)	$ (2,235)
Total assets	$ 175,569		$ 172,830