Reportable Segments - Reportable Segments Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017	Sep. 30, 2017
Net sales	$ 726,385	$ 618,832	$ 2,102,330	$ 1,858,200
Operating income (loss)	32,446	29,469	81,318	95,943
Interest expense	(2,910)	(3,294)	(10,182)	(9,830)
Interest income	1,068	1,299	4,049	3,555
Miscellaneous	(1,052)	(103)	(1,875)	1,147
Income before income taxes	29,552	27,371	73,310	90,815
Total assets	1,894,629		1,894,629		$ 1,976,182
Elimination of inter-segment sales
Net sales	(30,106)	(25,453)	(89,311)	(76,951)
Corporate
Operating income (loss)	(31,464)	(26,966)	(102,789)	(78,786)
Corporate and eliminations
Total assets	165,533		165,533		44,390
AMER | Operating Segments
Net sales	298,375	265,173	899,253	851,888
Operating income (loss)	6,799	7,392	28,025	30,418
Total assets	586,716		586,716		595,851
APAC | Operating Segments
Net sales	383,785	325,986	1,080,283	945,713
Operating income (loss)	55,274	49,811	154,977	148,535
Total assets	952,274		952,274		1,163,111
EMEA | Operating Segments
Net sales	74,331	53,126	212,105	137,550
Operating income (loss)	1,837	$ (768)	1,105	$ (4,224)
Total assets	$ 190,106		$ 190,106		$ 172,830