Segment and Geographic Information - Schedule of sales by geographic regions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 03, 2021	Apr. 04, 2020	Apr. 03, 2021	Apr. 04, 2020
Geographic information [Line Items]
Net sales	$ 373,982	$ 293,147	$ 700,035	$ 613,918
United States
Geographic information [Line Items]
Net sales	82,741	72,257	154,268	150,142
Total foreign countries sales
Geographic information [Line Items]
Net sales	291,241	220,890	545,767	463,776
South Korea
Geographic information [Line Items]
Net sales	62,553	56,928	134,391	116,983
China
Geographic information [Line Items]
Net sales	68,185	36,981	129,644	95,570
Japan
Geographic information [Line Items]
Net sales	40,155	26,366	63,494	48,718
Asia-Pacific, other
Geographic information [Line Items]
Net sales	31,320	21,639	58,731	43,800
Germany
Geographic information [Line Items]
Net sales	36,285	31,389	65,570	61,834
Europe, other
Geographic information [Line Items]
Net sales	34,537	32,702	63,068	67,214
Rest of World
Geographic information [Line Items]
Net sales	$ 18,206	$ 14,885	$ 30,869	$ 29,657